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研究活動

海 洋

大気中に放出された人工放射性核種は、大気中を運ばれた後、主に雨によって地表面および海洋表面に降下します(湿性沈着)。また一部は重力や表面との相互作用などにより地表面および海洋表面に降下します(乾性沈着)。あるいは直接海洋に放出される場合もあります。海洋表面に降下、または海洋へ直接漏洩した人工放射性核種は、その後海流にのって移動し、拡散し、粒子状物質として沈降などによって海洋内部へ配分され、一部は海洋生態系に取り込まれていきます。海洋は人工放射性核種の巨大なシンクであり、そこでの動き方を知ることは、環境における影響評価あるいは食物連鎖を経ての人間社会への影響を知る上で極めて重要です。

海洋1 海洋2 海洋3

 

Activity Log

平成29年9月18日 APSORC17で青山道夫特任教授が招待講演を行いました。

開催日 平成29年9月17日~22日
場所 韓国・済州島
会議 The 6th Asia-Pacific Symposium on Radiochemistry (APSORC17)
講演タイトル "Long term behavior of TEPCO Fukushima NPP1 accident radiocaesium in the coastal region of Japan and the North Pacific Ocean, past and present: A review"

主催者の依頼により、福島原子力発電所事故により海洋環境に放出された放射性セシウムの海洋での挙動について、事故直後から現在まで、沿岸から太平洋全域を概観し、講演をおこなった。以下は講演の概要である。
東部北太平洋では、まず最初に事故直後に大気経由で北米大陸沿岸に輸送があり、表層での濃度が増加した。また、2013年から2014年にかけての太平洋を横断した表層輸送により、2度目の濃度増加があり、セシウム137濃度が約10 Bq m-3まで増加している。北緯30度より北の西部北太平洋では、東向きの輸送が起きたあと、海洋表層では、事故以前のセシウム137濃度とほぼ同じ2 Bq m-3に急速に低下していた。北緯30度より南の海域では、表層海水中のセシウム137濃度は、事故後数Bq m-3に増加し、2015/2016/2017年で徐々に約2 Bq m-3に減少し、これは事故以前のセシウム137濃度とほぼ同じ2 Bq m-3である。日本海では、事故由来の放射性セシウムの再循環により放射性セシウム濃度が増加しつつある。
青山らによる事故により環境中に放出された放射性セシウム(137Csと134Cs、それぞれ同じ量)の値は、物質収支を満たしており、正確であるといえる。放射性セシウムの放出総量とその分配は以下のとおりである。
大気への放出量:15-20 PBq、
直接漏えい量:3-6 PBq、
北太平洋の大気沈着量:12-15 PBq、
北太平洋の事故起源セシウムの総量:15-18 PBq、
陸上への降下量:3-6 PBq

海洋に入ったうち、7.9±1.4 PBqは表層にあり、4.2±1.1 PBqは亜熱帯モード水(STMW)にあり、亜熱帯ジャイア全体に広がっている。中央モード水 (CMW)には3-6 PBqあると考えられる。STMWに入ったうち0.2 PBqはすでに日本海に再循環している。
事故サイトからは依然として放射性セシウムとトリチウム(3H)のわずかな漏えいは続いているが、その量は非常に小さく、収支には影響しない。しかし、現実の状況を知るためには科学を続ける必要がある。

Seawater sampling activity log during the period from October 2016 to December 2016

We collected seawater sample at Japan Sea by Oga Aquarium on 20 December 2016. A position was 39.94439 deg. N, 139.703366 deg. E at 0 meters depth. Sample volume was 10L and collected by Collaborator.

We collected seawater sample at Tomioka by coastal sampling on 29 November 2016. A position was 37.335228 deg. N, 141.031249 deg. E at 0 meters depth and of which the seawater temperature was 13 deg. C and salinity was 32.7. Sample volume was 10L and collected by Aoyama and Watanabe.

We collected seawater sample at Soma by coastal sampling on 29 November 2016. A position was 37.863701 deg. N, 140.940554 deg. E at 0 meters depth and of which the seawater temperature was 12.5 deg. C and salinity was 32. Sample volume was 10L and collected by Aoyama and Watanabe

We collected seawater sample at Hasaki by coastal sampling on 28 November 2016. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was 16.1 deg. C and salinity was 33.38. Sample volume was 4L and collected by Collaborator.

Figure 5 sampling points at off Tomioka in November 2016

We collected seawater sample at Off Tomioka by a boat on 24 November 2016. A position was 37.33388 deg. N, 141.04226 deg. E at 0 meters depth and of which the seawater temperature was deg. C and salinity was . Sample volume was and collected by Tsumune .

We collected seawater sample at Off Tomioka by a boat on 24 November 2016. A position was 37.33396 deg. N, 141.03958 deg. E at 0 meters depth and of which the seawater temperature was deg. C and salinity was . Sample volume was and collected by Tsumune .

We collected seawater sample at Off Tomioka by a boat on 24 November 2016. A position was 37.33423 deg. N, 141.03446 deg. E at 0 meters depth and of which the seawater temperature was deg. C and salinity was . Sample volume was and collected by Tsumune .

We collected seawater sample at Off Tomioka by a boat on 24 November 2016. A position was 37.33436 deg. N, 141.03239 deg. E at 0 meters depth and of which the seawater temperature was deg. C and salinity was . Sample volume was and collected by Tsumune .

We collected seawater sample at Japan Sea by Oga Aquarium on 30 October 2016. A position was 39.94439 deg. N, 139.703366 deg. E at 0 meters depth and of which the seawater temperature was 18.4 deg. C and salinity was 0. Sample volume was 10L and collected by Collaborator .

Figure Sampling at Tomioka on 11 October 2016

We collected seawater sample at Tomioka by coastal sampling on 11 October 2016. A position was 37.335228 deg. N, 141.031249 deg. E at 0 meters depth and of which the seawater temperature was 21 deg. C and salinity was 32.2. Sample volume was 10L and collected by Aoyama , Watanabe and .

Figure Sampling at Soma on 11 October 2016

We collected seawater sample at Soma by coastal sampling on 11 October 2016. A position was 37.863701 deg. N, 140.940554 deg. E at 0 meters depth and of which the seawater temperature was 19 deg. C and salinity was 27.7. Sample volume was 10L and collected by Aoyama , Watanabe and .

Seawater sampling activity log during the period from July 2016 to September 2016

We collected seawater sample at East China Sea by a ferry on 29 September 2016. A position was 28.542625 deg. N, 129.53954167 deg. E at 0 meters depth and of which the seawater temperature was 0 deg. C and salinity was 0. Sample volume was 10L and collected by Watanabe .

We collected seawater sample at Hasaki by coastal sampling on 26 September 2016. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was 23.9 deg. C and salinity was 29.7. Sample volume was 4L and collected by Collaborator .

We collected seawater sample at East China Sea by a ferry on 21 September 2016. A position was 30.823858333 deg. N, 130.50548333 deg. E at 0 meters depth and of which the seawater temperature was 0 deg. C and salinity was 0. Sample volume was 10L and collected by Watanabe . W

e collected seawater sample at East China Sea by a ferry on 20 September 2016. A position was 29.733158333 deg. N, 130.04376667 deg. E at 0 meters depth and of which the seawater temperature was 23 deg. C and salinity was 0. Sample volume was 10L and collected by Watanabe .

We collected seawater sample at East China Sea by a ferry on 20 September 2016. A position was 27.8537 deg. N, 129.03400333 deg. E at 0 meters depth and of which the seawater temperature was 21 deg. C and salinity was 0. Sample volume was 10L and collected by Watanabe .

We collected seawater sample at East China Sea by a ferry on 20 September 2016. A position was 27.137083333 deg. N, 128.44715 deg. E at 0 meters depth and of which the seawater temperature was 22 deg. C and salinity was 0. Sample volume was 10L and collected by Watanabe .

We collected seawater sample at East China Sea by a ferry on 20 September 2016. A position was 26.748983333 deg. N, 127.90668333 deg. E at 0 meters depth and of which the seawater temperature was 22 deg. C and salinity was 0. Sample volume was 10L and collected by Watanabe .

We collected seawater sample at Japan Sea by Oga Aquarium on 7 September 2016. A position was 39.94439 deg. N, 139.703366 deg. E at 0 meters depth and of which the seawater temperature was 26.1 deg. C and salinity was 32.9. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Hasaki by coastal sampling on 25 July 2016. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was 23.9 deg. C and salinity was 33.48. Sample volume was 4L and collected by Collaborator .

Seawater sampling activity log during the period from April 2016 to June 2016

Figure Sampling stations during the period from November 2015 to June 2016 around japan

We collected seawater sample at Tomioka by coastal sampling on 30 June 2016. A position was 37.335228 deg. N, 141.031249 deg. E at 0 meters depth and of which the seawater temperature was 20 deg. C and salinity was 32. Sample volume was 10L and collected by Aoyama and Watanabe .

We collected seawater sample at Soma by coastal sampling on 30 June 2016. A position was 37.863701 deg. N, 140.940554 deg. E at 0 meters depth and of which the seawater temperature was 20.5 deg. C and salinity was 32. Sample volume was 10L and collected by Aoyama and Watanabe .

We collected seawater sample at Seto-naikai by a research vessel on 22 June 2016. A position was 34.088333333 deg. N, 132.83 deg. E at 0 meters depth and of which the seawater temperature was 21.9 deg. C and salinity was 31.7. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Seto-naikai by a research vessel on 21 June 2016. A position was 34.57175 deg. N, 134.825 deg. E at 0 meters depth and of which the seawater temperature was 19.4 deg. C and salinity was 32.8. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Tomioka by coastal sampling on 14 June 2016. A position was 37.335228 deg. N, 141.031249 deg. E at 0 meters depth and of which the seawater temperature was 16.5 deg. C and salinity was 33.6. Sample volume was 10L and collected by Watanabe .

We collected seawater sample at Soma by coastal sampling on 14 June 2016. A position was 37.863701 deg. N, 140.940554 deg. E at 0 meters depth and of which the seawater temperature was 19 deg. C and salinity was 32.1. Sample volume was 10L and collected by Watanabe .

We collected seawater sample at Hasaki by coastal sampling on 13 June 2016. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was 17.3 deg. C and salinity was 34.01. Sample volume was 4L and collected by Collaborator .

We collected seawater sample at FNPP1 coast by a research vessel on 12 June 2016. A position was 36.920416667 deg. N, 141.092 deg. E at 0 meters depth and of which the seawater temperature was 19.6653 deg. C and salinity was 34.1825. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at FNPP1 coast by a research vessel on 12 June 2016. A position was 36.916591667 deg. N, 141.00116667 deg. E at 0 meters depth and of which the seawater temperature was 18.6723 deg. C and salinity was 33.8329. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at FNPP1 coast by a research vessel on 12 June 2016. A position was 36.920333333 deg. N, 141.09216667 deg. E at 100 meters depth and of which the seawater temperature was 9.4469 deg. C and salinity was 33.8417. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at FNPP1 coast by a research vessel on 12 June 2016. A position was 36.920333333 deg. N, 141.09216667 deg. E at 50 meters depth and of which the seawater temperature was 10.4955 deg. C and salinity was 33.7247. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at FNPP1 coast by a research vessel on 12 June 2016. A position was 36.920333333 deg. N, 141.09216667 deg. E at 20 meters depth and of which the seawater temperature was 14.2019 deg. C and salinity was 33.6968. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at FNPP1 coast by a research vessel on 12 June 2016. A position was 36.920333333 deg. N, 141.09216667 deg. E at 10 meters depth and of which the seawater temperature was 18.5301 deg. C and salinity was 34.1516. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at FNPP1 coast by a research vessel on 10 June 2016. A position was 37.230266667 deg. N, 141.130025 deg. E at 0 meters depth and of which the seawater temperature was 16.4065 deg. C and salinity was 33.6034. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at FNPP1 coast by a research vessel on 10 June 2016. A position was 37.230266667 deg. N, 141.130025 deg. E at 50 meters depth and of which the seawater temperature was 10.5218 deg. C and salinity was 33.8222. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at FNPP1 coast by a research vessel on 10 June 2016. A position was 37.230266667 deg. N, 141.130025 deg. E at 20 meters depth and of which the seawater temperature was 13.184 deg. C and salinity was 33.5579. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at FNPP1 coast by a research vessel on 10 June 2016. A position was 37.229366667 deg. N, 141.12988333 deg. E at 10 meters depth and of which the seawater temperature was 14.5115 deg. C and salinity was 33.5063. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at FNPP1 coast by a research vessel on 10 June 2016. A position was 37.229366667 deg. N, 141.12988333 deg. E at 0 meters depth and of which the seawater temperature was 16.5738 deg. C and salinity was 33.3662. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at FNPP1 coast by a research vessel on 10 June 2016. A position was 37.229366667 deg. N, 141.12988333 deg. E at 0 meters depth and of which the seawater temperature was 16.5738 deg. C and salinity was 33.3662. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at FNPP1 coast by a research vessel on 10 June 2016. A position was 37.229366667 deg. N, 141.12988333 deg. E at 0 meters depth and of which the seawater temperature was 16.5738 deg. C and salinity was 33.3662. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at FNPP1 coast by a research vessel on 6 June 2016. A position was 37.419133333 deg. N, 141.09495 deg. E at 0 meters depth and of which the seawater temperature was 15.2 deg. C and salinity was 33.26. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at FNPP1 coast by a research vessel on 6 June 2016. A position was 37.4153 deg. N, 141.18018333 deg. E at 0 meters depth and of which the seawater temperature was 15.1 deg. C and salinity was 33.24. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at FNPP1 coast by a research vessel on 6 June 2016. A position was 37.419133333 deg. N, 141.09495 deg. E at 20 meters depth and of which the seawater temperature was 15.2 deg. C and salinity was 33.26. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at FNPP1 coast by a research vessel on 6 June 2016. A position was 37.419133333 deg. N, 141.09495 deg. E at 10 meters depth and of which the seawater temperature was 15.2 deg. C and salinity was 33.26. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Hasaki by coastal sampling on 6 June 2016. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was 16.2 deg. C and salinity was 34.5. Sample volume was 4L and collected by Collaborator .

We collected seawater sample at FNPP1 coast by a research vessel on 5 June 2016. A position was 37.424166667 deg. N, 141.29329167 deg. E at 100 meters depth and of which the seawater temperature was 33.8467 deg. C and salinity was 9.4365. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at FNPP1 coast by a research vessel on 5 June 2016. A position was 37.423833333 deg. N, 141.29458333 deg. E at 50 meters depth and of which the seawater temperature was 33.7415 deg. C and salinity was 10.8463. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at FNPP1 coast by a research vessel on 5 June 2016. A position was 37.424166667 deg. N, 141.29329167 deg. E at 20 meters depth and of which the seawater temperature was 14.5619 deg. C and salinity was 33.3332. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at FNPP1 coast by a research vessel on 5 June 2016. A position was 37.423833333 deg. N, 141.155625 deg. E at 10 meters depth and of which the seawater temperature was 15.3 deg. C and salinity was 33.24. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at FNPP1 coast by a research vessel on 3 June 2016. A position was 37.423833333 deg. N, 141.29329167 deg. E at 0 meters depth and of which the seawater temperature was 15.1176 deg. C and salinity was 33.2412. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at FNPP1 coast by a research vessel on 3 June 2016. A position was 37.553558333 deg. N, 141.126975 deg. E at 0 meters depth and of which the seawater temperature was 14.6675 deg. C and salinity was 33.2902. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at FNPP1 coast by a research vessel on 3 June 2016. A position was 37.749633333 deg. N, 141.288325 deg. E at 0 meters depth and of which the seawater temperature was 14.648 deg. C and salinity was 33.2972. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at FNPP1 coast by a research vessel on 3 June 2016. A position was 37.553691667 deg. N, 141.12698333 deg. E at 20 meters depth and of which the seawater temperature was 12.5537 deg. C and salinity was 33.5157. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at FNPP1 coast by a research vessel on 3 June 2016. A position was 37.553691667 deg. N, 141.12698333 deg. E at 10 meters depth and of which the seawater temperature was 14.5245 deg. C and salinity was 33.3212. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at FNPP1 coast by a research vessel on 3 June 2016. A position was 37.749933333 deg. N, 141.28848333 deg. E at 50 meters depth and of which the seawater temperature was 10.5843 deg. C and salinity was 33.808. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at FNPP1 coast by a research vessel on 3 June 2016. A position was 37.749933333 deg. N, 141.28848333 deg. E at 20 meters depth and of which the seawater temperature was 13.5092 deg. C and salinity was 33.3162. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at FNPP1 coast by a research vessel on 3 June 2016. A position was 37.749933333 deg. N, 141.28848333 deg. E at 10 meters depth and of which the seawater temperature was 14.4726 deg. C and salinity was 33.3039. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Japan Sea by a research vessel on 2 June 2016. A position was 36.903408333 deg. N, 137.16890833 deg. E at 0 meters depth and of which the seawater temperature was 17.2144 deg. C and salinity was 33.1155. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Tomioka by coastal sampling on 2 June 2016. A position was 37.335228 deg. N, 141.031249 deg. E at 0 meters depth and of which the seawater temperature was 15 deg. C and salinity was 34.3. Sample volume was 60L and collected by Aoyama , Watanabe Kayakuda .

We collected seawater sample at Soma by coastal sampling on 2 June 2016. A position was 37.863701 deg. N, 140.940554 deg. E at 0 meters depth and of which the seawater temperature was 17 deg. C and salinity was 32.7. Sample volume was 10L and collected by Aoyama , Watanabe Kayakuda .

We collected seawater sample at Hasaki by coastal sampling on 30 May 2016. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was 16.7 deg. C and salinity was 34.01. Sample volume was 4L and collected by Collaborator .

We collected seawater sample at Japan Sea by a research vessel on 17 May 2016. A position was 36.841866667 deg. N, 137.2386 deg. E at 0 meters depth and of which the seawater temperature was 17.2144 deg. C and salinity was 33.1155. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Japan Sea by a research vessel on 17 May 2016. A position was 36.948975 deg. N, 137.34515 deg. E at 0 meters depth and of which the seawater temperature was 18.07 deg. C and salinity was 33.2665. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Tomioka by coastal sampling on 16 May 2016. A position was 37.335228 deg. N, 141.031249 deg. E at 0 meters depth and of which the seawater temperature was 16 deg. C and salinity was 32.5. Sample volume was 10L and collected by Aoyama , Inomata .

We collected seawater sample at Soma by coastal sampling on 16 May 2016. A position was 37.863701 deg. N, 140.940554 deg. E at 0 meters depth and of which the seawater temperature was 17.5 deg. C and salinity was 28.1. Sample volume was 10L and collected by Aoyama , Inomata .

We collected seawater sample at Japan Sea by a research vessel on 11 May 2016. A position was 37.291966667 deg. N, 137.4996 deg. E at 0 meters depth and of which the seawater temperature was 15.1 deg. C and salinity was 34.33. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Japan Sea by a research vessel on 10 May 2016. A position was 37.407125 deg. N, 137.48266667 deg. E at 0 meters depth and of which the seawater temperature was 15.1 deg. C and salinity was 34.36. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Japan Sea by a research vessel on 9 May 2016. A position was 37.412475 deg. N, 136.00839167 deg. E at 0 meters depth and of which the seawater temperature was 15.7 deg. C and salinity was 34.46. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Japan Sea by a research vessel on 9 May 2016. A position was 36.895041667 deg. N, 134.00181667 deg. E at 0 meters depth and of which the seawater temperature was 14.6 deg. C and salinity was 34.36. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Japan Sea by a research vessel on 8 May 2016. A position was 36.335791667 deg. N, 132.00289167 deg. E at 0 meters depth and of which the seawater temperature was 16.5 deg. C and salinity was 34.48. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Japan Sea by a research vessel on 8 May 2016. A position was 35.955158333 deg. N, 131.00905833 deg. E at 0 meters depth and of which the seawater temperature was 15.2 deg. C and salinity was 34.39. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Japan Sea by a research vessel on 8 May 2016. A position was 34.892375 deg. N, 129.51409167 deg. E at 0 meters depth and of which the seawater temperature was 16.9 deg. C and salinity was 34.53. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Japan Sea by a research vessel on 7 May 2016. A position was 34.551558333 deg. N, 129.63513333 deg. E at 0 meters depth and of which the seawater temperature was 17.3 deg. C and salinity was 34.57. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Japan Sea by a research vessel on 7 May 2016. A position was 34.182416667 deg. N, 129.89518333 deg. E at 0 meters depth and of which the seawater temperature was 18.4 deg. C and salinity was 34.63. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Japan Sea by a research vessel on 7 May 2016. A position was 33.846375 deg. N, 130.14764167 deg. E at 0 meters depth and of which the seawater temperature was 18.1 deg. C and salinity was 34.51. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Japan Sea by a research vessel on 20 April 2016. A position was 35.7275 deg. N, 136.0625 deg. E at 0 meters depth and of which the seawater temperature was 13.797 deg. C and salinity was 33.844. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Japan Sea by a research vessel on 20 April 2016. A position was 35.8625 deg. N, 135.96916667 deg. E at 0 meters depth and of which the seawater temperature was 14.227 deg. C and salinity was 34.254. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Japan Sea by a research vessel on 20 April 2016. A position was 36.309166667 deg. N, 136.0375 deg. E at 0 meters depth and of which the seawater temperature was 13.805 deg. C and salinity was 33.702. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Japan Sea by a research vessel on 20 April 2016. A position was 36.874166667 deg. N, 136.23833333 deg. E at 0 meters depth and of which the seawater temperature was 13.213 deg. C and salinity was 34.436. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Japan Sea by a research vessel on 20 April 2016. A position was 37.4125 deg. N, 136.44166667 deg. E at 0 meters depth and of which the seawater temperature was 13.119 deg. C and salinity was 34.41. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Japan Sea by a research vessel on 19 April 2016. A position was 38.776666667 deg. N, 137.48 deg. E at 0 meters depth and of which the seawater temperature was 10.496 deg. C and salinity was 34.095. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Japan Sea by a research vessel on 19 April 2016. A position was 39.931666667 deg. N, 138.695 deg. E at 0 meters depth and of which the seawater temperature was 10.889 deg. C and salinity was 33.951. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Japan Sea by a research vessel on 19 April 2016. A position was 40.816666667 deg. N, 139.62833333 deg. E at 0 meters depth and of which the seawater temperature was 10.622 deg. C and salinity was 33.906. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at East China Sea by a research vessel on 4 April 2016. A position was 31.201666667 deg. N, 129.83666667 deg. E at 0 meters depth and of which the seawater temperature was 21.5 deg. C and salinity was 34. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at East China Sea by a research vessel on 4 April 2016. A position was 31.433333333 deg. N, 128.99833333 deg. E at 0 meters depth and of which the seawater temperature was 20.31 deg. C and salinity was 34. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at East China Sea by a research vessel on 3 April 2016. A position was 31.475 deg. N, 128.50583333 deg. E at 0 meters depth and of which the seawater temperature was 20.1 deg. C and salinity was 34. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at East China Sea by a research vessel on 3 April 2016. A position was 31.493333333 deg. N, 128.015 deg. E at 0 meters depth and of which the seawater temperature was 20.4 deg. C and salinity was 34. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at East China Sea by a research vessel on 3 April 2016. A position was 31.5975 deg. N, 127.6525 deg. E at 0 meters depth and of which the seawater temperature was 17.95 deg. C and salinity was 33.9. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at East China Sea by a research vessel on 2 April 2016. A position was 32.631666667 deg. N, 129.29583333 deg. E at 0 meters depth and of which the seawater temperature was 18.95 deg. C and salinity was 34. Sample volume was 10L and collected by Collaborator .

Seawater sampling activity log during the period from January 2016 to March 2016

We collected seawater sample at Hasaki by coastal sampling on 28 March 2016. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was 9.6 deg. C and salinity was 32.63. Sample volume was 4L and collected by Collaborator .

We collected seawater sample at Tomioka by coastal sampling on 24 March 2016. A position was 37.335228 deg. N, 141.031249 deg. E at 0 meters depth and of which the seawater temperature was 10 deg. C and salinity was 34.1. Sample volume was 20L and collected by Aoyama , Watanabe .

We collected seawater sample at Soma by coastal sampling on 24 March 2016. A position was 37.863701 deg. N, 140.940554 deg. E at 0 meters depth and of which the seawater temperature was 9.5 deg. C and salinity was 34.1. Sample volume was 10L and collected by Aoyama , Watanabe .

We collected seawater sample at Japan Sea by a ferry on 17 March 2016. A position was 38.065 deg. N, 138.84083333 deg. E at 0 meters depth and of which the seawater temperature was 15.2 deg. C and salinity was 34.1. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Japan Sea by a ferry on 17 March 2016. A position was 38.104166667 deg. N, 138.58833333 deg. E at 0 meters depth and of which the seawater temperature was 15.2 deg. C and salinity was 34.1. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Japan Sea by a research vessel on 17 March 2016. A position was 36.865 deg. N, 137.18166667 deg. E at 0 meters depth and of which the seawater temperature was 10.324 deg. C and salinity was 31.285. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at East China Sea by a ferry on 15 March 2016. A position was 30.823858333 deg. N, 130.50548333 deg. E at 0 meters depth and of which the seawater temperature was 0 deg. C and salinity was 0. Sample volume was 10L and collected by Watanabe .

We collected seawater sample at East China Sea by a ferry on 15 March 2016. A position was 29.733158333 deg. N, 130.04376667 deg. E at 0 meters depth and of which the seawater temperature was 23 deg. C and salinity was 0. Sample volume was 10L and collected by Watanabe .

We collected seawater sample at East China Sea by a ferry on 15 March 2016. A position was 28.542625 deg. N, 129.53954167 deg. E at 0 meters depth and of which the seawater temperature was 0 deg. C and salinity was 0. Sample volume was 10L and collected by Watanabe .

We collected seawater sample at East China Sea by a ferry on 14 March 2016. A position was 27.8537 deg. N, 129.03400333 deg. E at 0 meters depth and of which the seawater temperature was 21 deg. C and salinity was 0. Sample volume was 10L and collected by Watanabe .

We collected seawater sample at East China Sea by a ferry on 14 March 2016. A position was 27.137083333 deg. N, 128.44715 deg. E at 0 meters depth and of which the seawater temperature was 22 deg. C and salinity was 0. Sample volume was 10L and collected by Watanabe .

We collected seawater sample at East China Sea by a ferry on 14 March 2016. A position was 26.748983333 deg. N, 127.90668333 deg. E at 0 meters depth and of which the seawater temperature was 22 deg. C and salinity was 0. Sample volume was 10L and collected by Watanabe .

We collected seawater sample at Western North Pacific by a research vessel on 13 March 2016. A position was 34.770166667 deg. N, 140.7535 deg. E at 0 meters depth and of which the seawater temperature was 18.85 deg. C and salinity was 34.79. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Western North Pacific by a research vessel on 12 March 2016. A position was 35.6644 deg. N, 141.0016 deg. E at 0 meters depth and of which the seawater temperature was 16.191 deg. C and salinity was 34.686. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Western North Pacific by a research vessel on 12 March 2016. A position was 33.85845 deg. N, 139.00395833 deg. E at 0 meters depth and of which the seawater temperature was 20.697 deg. C and salinity was 34.895. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Western North Pacific by a research vessel on 12 March 2016. A position was 33.3085 deg. N, 137.190275 deg. E at 0 meters depth and of which the seawater temperature was 21.051 deg. C and salinity was 34.913. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Western North Pacific by a research vessel on 11 March 2016. A position was 33.154391667 deg. N, 135.76591667 deg. E at 0 meters depth and of which the seawater temperature was 21.238 deg. C and salinity was 34.927. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Western North Pacific by a research vessel on 11 March 2016. A position was 33.637558333 deg. N, 135.056625 deg. E at 0 meters depth and of which the seawater temperature was 17.58 deg. C and salinity was 34.738. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Seto-naikai by a research vessel on 11 March 2016. A position was 34.079416667 deg. N, 134.966625 deg. E at 0 meters depth and of which the seawater temperature was 13.45 deg. C and salinity was 33.03. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Seto-naikai by a research vessel on 11 March 2016. A position was 34.4467 deg. N, 135.11560833 deg. E at 0 meters depth and of which the seawater temperature was 11.85 deg. C and salinity was 31.492. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at East China Sea by a research vessel on 29 February 2016. A position was 32.753333333 deg. N, 129.39333333 deg. E at 0 meters depth and of which the seawater temperature was 15.2 deg. C and salinity was 34.1. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Hasaki by coastal sampling on 29 February 2016. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was 10.1 deg. C and salinity was 34.01. Sample volume was 4L and collected by Collaborator .

We collected seawater sample at East China Sea by a research vessel on 26 February 2016. A position was 32.731666667 deg. N, 129.18 deg. E at 0 meters depth and of which the seawater temperature was 15 deg. C and salinity was 34. Sample volume was 10L and collected by Watanabe .

We collected seawater sample at Tomioka by coastal sampling on 24 February 2016. A position was 37.335228 deg. N, 141.031249 deg. E at 0 meters depth and of which the seawater temperature was 8.5 deg. C and salinity was 33.2. Sample volume was 10L and collected by Aoyama , Watanabe .

We collected seawater sample at Soma by coastal sampling on 24 February 2016. A position was 37.863701 deg. N, 140.940554 deg. E at 0 meters depth and of which the seawater temperature was 8 deg. C and salinity was 32.7. Sample volume was 10L and collected by Aoyama , Watanabe .

We collected seawater sample at Tsugaru Straight by a research vessel on 23 February 2016. A position was 41.536083333 deg. N, 141.37658333 deg. E at 0 meters depth and of which the seawater temperature was 9.8413 deg. C and salinity was 33.7578. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Tsugaru Straight by a research vessel on 23 February 2016. A position was 41.683583333 deg. N, 141.29616667 deg. E at 0 meters depth and of which the seawater temperature was 9.018 deg. C and salinity was 33.7428. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Tsugaru Straight by a research vessel on 22 February 2016. A position was 41.818416667 deg. N, 141.22075 deg. E at 0 meters depth and of which the seawater temperature was 6.3016 deg. C and salinity was 33.2293. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Japan Sea by a research vessel on 17 February 2016. A position was 36.866 deg. N, 137.15 deg. E at 0 meters depth and of which the seawater temperature was 11.4211 deg. C and salinity was 37.952. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Japan Sea by a ferry on 16 February 2016. A position was 38.0425 deg. N, 138.82 deg. E at 0 meters depth and of which the seawater temperature was 11 deg. C and salinity was 0. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Japan Sea by a ferry on 16 February 2016. A position was 38.076666667 deg. N, 138.69583333 deg. E at 0 meters depth and of which the seawater temperature was 11 deg. C and salinity was 0. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Japan Sea by a research vessel on 2 February 2016. A position was 35.65702 deg. N, 134.8728 deg. E at 0 meters depth and of which the seawater temperature was 0 deg. C and salinity was 0. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Japan Sea by Oga Aquarium on 2 February 2016. A position was 39.94439 deg. N, 139.703366 deg. E at 0 meters depth and of which the seawater temperature was 10.5 deg. C and salinity was 33. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at East China Sea by a ferry on 28 January 2016. A position was 30.815 deg. N, 130.49833333 deg. E at 0 meters depth and of which the seawater temperature was 20 deg. C and salinity was 34.5. Sample volume was 10L and collected by Watanabe .

We collected seawater sample at East China Sea by a ferry on 28 January 2016. A position was 29.724166667 deg. N, 130.04 deg. E at 0 meters depth and of which the seawater temperature was 22 deg. C and salinity was 34.4. Sample volume was 10L and collected by Watanabe .

We collected seawater sample at East China Sea by a ferry on 27 January 2016. A position was 28.535 deg. N, 129.535 deg. E at 0 meters depth and of which the seawater temperature was 22 deg. C and salinity was 34.5. Sample volume was 10L and collected by Watanabe .

We collected seawater sample at East China Sea by a ferry on 27 January 2016. A position was 27.841666667 deg. N, 129.06416667 deg. E at 0 meters depth and of which the seawater temperature was 22 deg. C and salinity was 34.6. Sample volume was 10L and collected by Watanabe .

We collected seawater sample at East China Sea by a ferry on 27 January 2016. A position was 27.129166667 deg. N, 128.44333333 deg. E at 0 meters depth and of which the seawater temperature was 22 deg. C and salinity was 34.4. Sample volume was 10L and collected by Watanabe .

We collected seawater sample at East China Sea by a ferry on 27 January 2016. A position was 26.7425 deg. N, 127.89166667 deg. E at 0 meters depth and of which the seawater temperature was 22 deg. C and salinity was 34.1. Sample volume was 10L and collected by Watanabe .

We collected seawater sample at Hasaki by coastal sampling on 25 January 2016. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was 10.1 deg. C and salinity was 33.85. Sample volume was 4L and collected by Collaborator .

We collected seawater sample at Off Tomioka by a boat on 24 November 2016. A position was 37.33416 deg. N, 141.03723 deg. E at 0 meters depth and of which the seawater temperature was deg. C and salinity was . Sample volume was and collected by Tsumune .

We collected seawater sample at Tomioka by coastal sampling on 19 January 2016. A position was 37.335228 deg. N, 141.031249 deg. E at 0 meters depth and of which the seawater temperature was 9 deg. C and salinity was 30.5. Sample volume was 20L and collected by Aoyama , Inomata and Watanabe . Seawater sampling activity log during the period from October 2015 to December 2015

We collected seawater sample at Hasaki by coastal sampling on 28 December 2015. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was 13.3 deg. C and salinity was 34.23. Sample volume was 4L and collected by Collaborator .

We collected seawater sample at Tomioka by coastal sampling on 22 December 2015. A position was 37.335228 deg. N, 141.031249 deg. E at 0 meters depth and of which the seawater temperature was 12 deg. C and salinity was 32.8. Sample volume was 10L and collected by Aoyama , Watanabe and Nakamoto .

We collected seawater sample at Soma by coastal sampling on 22 December 2015. A position was 37.863701 deg. N, 140.940554 deg. E at 0 meters depth and of which the seawater temperature was 10.5 deg. C and salinity was 31.9. Sample volume was 10L and collected by Aoyama , Watanabe and .

We collected seawater sample at Hasaki by coastal sampling on 30 November 2015. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was 14.8 deg. C and salinity was 32. Sample volume was 4L and collected by Collaborator .

We collected seawater sample at Tomioka by coastal sampling on 19 November 2015. A position was 37.335228 deg. N, 141.031249 deg. E at 0 meters depth and of which the seawater temperature was 19 deg. C and salinity was 30.3. Sample volume was 40L and collected by Aoyama , Inomata and Nakamoto .

We collected seawater sample at Western North Pacific by a research vessel on 16 November 2015. A position was 32.05765167 deg. N, 134.2341217 deg. E at 0 meters depth and of which the seawater temperature was 23.8 deg. C and salinity was 34.739. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at East China Sea by a research vessel on 16 November 2015. A position was 31.00423167 deg. N, 130.0212767 deg. E at 0 meters depth and of which the seawater temperature was 23.5 deg. C and salinity was 34.698. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at East China Sea by a research vessel on 15 November 2015. A position was 29.99748333 deg. N, 129.5026367 deg. E at 0 meters depth and of which the seawater temperature was 25 deg. C and salinity was 34.779. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at East China Sea by a research vessel on 15 November 2015. A position was 28.99888833 deg. N, 129.0007583 deg. E at 0 meters depth and of which the seawater temperature was 25.2 deg. C and salinity was 34.83. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at East China Sea by a research vessel on 15 November 2015. A position was 29.52766167 deg. N, 127.8407567 deg. E at 0 meters depth and of which the seawater temperature was 24.3 deg. C and salinity was 34.358. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at East China Sea by a research vessel on 13 November 2015. A position was 28.75464667 deg. N, 126.9188267 deg. E at 0 meters depth and of which the seawater temperature was 24 deg. C and salinity was 34.481. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at East China Sea by a research vessel on 12 November 2015. A position was 28.50856667 deg. N, 127.17899 deg. E at 0 meters depth and of which the seawater temperature was 25.1 deg. C and salinity was 34.715. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at East China Sea by a research vessel on 12 November 2015. A position was 28.29474833 deg. N, 127.4590867 deg. E at 0 meters depth and of which the seawater temperature was 25.3 deg. C and salinity was 34.78. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at East China Sea by a research vessel on 11 November 2015. A position was 28.00843667 deg. N, 127.6554517 deg. E at 0 meters depth and of which the seawater temperature was 25.3 deg. C and salinity was 34.817. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at East China Sea by a research vessel on 11 November 2015. A position was 27.50259167 deg. N, 128.1544133 deg. E at 0 meters depth and of which the seawater temperature was 24.8 deg. C and salinity was 34.754. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at East China Sea by a research vessel on 11 November 2015. A position was 26.35914333 deg. N, 127.2465133 deg. E at 0 meters depth and of which the seawater temperature was 25.1 deg. C and salinity was 34.835. Sample volume was 10L and collected by Collaborator .

We collected seawater sample at Hasaki by coastal sampling on 26 October 2015. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was 19.6 deg. C and salinity was 33.95. Sample volume was 4L and collected by Collaborator .

We collected seawater sample at Tomioka by coastal sampling on 20 October 2015. A position was 37.335228 deg. N, 141.031249 deg. E at 0 meters depth and of which the seawater temperature was 21 deg. C and salinity was 33. Sample volume was 10L and collected by Aoyama , Watanabe and . Seawater sampling activity log during the period from July 2015 to September 2015

We collected seawater sample at Hasaki by coastal sampling on 28 September 2015. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was 22.5 deg. C and salinity was 31. Sample volume was 4L and collected by Collaborator .

We collected seawater sample at Tomioka by coastal sampling on 15 September 2015. A position was 37.335228 deg. N, 141.031249 deg. E at 0 meters depth and of which the seawater temperature was 24 deg. C and salinity was 26.4. Sample volume was 20L and collected by Aoyama , Inomata and Watanabe .

We collected seawater sample at Tomioka by coastal sampling on 24 August 2015. A position was 37.335228 deg. N, 141.031249 deg. E at 0 meters depth and of which the seawater temperature was 24 deg. C and salinity was 32.1. Sample volume was 40L and collected by Aoyama , Inomata and Watanabe .

We collected seawater sample at Hasaki by coastal sampling on 24 August 2015. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was 24.5 deg. C and salinity was 33.26. Sample volume was 4L and collected by Collaborator .

We collected seawater sample at Hasaki by coastal sampling on 27 July 2015. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was 21.7 deg. C and salinity was 33.27. Sample volume was 4L and collected by Collaborator .

We collected seawater sample at Tomioka by coastal sampling on 24 July 2015. A position was 37.335228 deg. N, 141.031249 deg. E at 0 meters depth and of which the seawater temperature was 21 deg. C and salinity was 32.1. Sample volume was 30L and collected by Aoyama , Inomata and .

Seawater sampling activity log during the period from April 2015 to June 2015

We collected seawater sample at Hasaki by coastal sampling on 25 May 2015. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was 15 deg. C and salinity was 34.29. Sample volume was 4L and collected by Collaborator .

We collected seawater sample at Tomioka by coastal sampling on 19 May 2015. A position was 37.335228 deg. N, 141.031249 deg. E at 0 meters depth and of which the seawater temperature was 18 deg. C and salinity was 32.2. Sample volume was 40L and collected by Aoyama , Jakob and Inomata .

We collected seawater sample at Hasaki by coastal sampling on 11 May 2015. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was 16.3 deg. C and salinity was 34.35. Sample volume was 4L and collected by Collaborator .

We collected seawater sample at Hasaki by coastal sampling on 27 April 2015. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was 13.4 deg. C and salinity was 34.1. Sample volume was 4L and collected by Collaborator .

We collected seawater sample at Hasaki by coastal sampling on 13 April 2015. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was 10.5 deg. C and salinity was 30.8. Sample volume was 4L and collected by Collaborator . Seawater sampling activity log during the period from January 2015 to March 2015

We collected seawater sample at Hasaki by coastal sampling on 30 March 2015. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was 9.8 deg. C and salinity was 33.76. Sample volume was 4L and collected by Collaborator .

We collected seawater sample at Tomioka by coastal sampling on 17 March 2015. A position was 37.335228 deg. N, 141.031249 deg. E at 0 meters depth and of which the seawater temperature was 10 deg. C and salinity was 32.3. Sample volume was 20L and collected by Aoyama , Inomata and Hayakawa .

We collected seawater sample at Hasaki by coastal sampling on 16 March 2015. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was 8.6 deg. C and salinity was 29.7. Sample volume was 4L and collected by Collaborator .

We collected seawater sample at Hasaki by coastal sampling on 2 March 2015. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was 8.7 deg. C and salinity was 34.02. Sample volume was 4L and collected by Collaborator .

We collected seawater sample at Tomioka by coastal sampling on 17 February 2015. A position was 37.335228 deg. N, 141.031249 deg. E at 0 meters depth and of which the seawater temperature was 7 deg. C and salinity was 32.8. Sample volume was 20L and collected by Aoyama , Inomata and Nemoto, Toyota, Kinoshita .

We collected seawater sample at Hasaki by coastal sampling on 16 February 2015. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was 9.8 deg. C and salinity was 34.61. Sample volume was 4L and collected by Collaborator .

We collected seawater sample at Hasaki by coastal sampling on 2 February 2015. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was 11 deg. C and salinity was 34.52. Sample volume was 4L and collected by Collaborator .

We collected seawater sample at Tomioka by coastal sampling on 19 January 2015. A position was 37.335228 deg. N, 141.031249 deg. E at 0 meters depth and of which the seawater temperature was 9.5 deg. C and salinity was 33.1. Sample volume was 20L and collected by Aoyama , Inomata and Tomizawa, Kinoshita, Abe .

We collected seawater sample at Hasaki by coastal sampling on 19 January 2015. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was 11.5 deg. C and salinity was 34.38. Sample volume was 4L and collected by Collaborator .

We collected seawater sample at Hasaki by coastal sampling on 5 January 2015. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was 11.2 deg. C and salinity was 34.31. Sample volume was 4L and collected by Collaborator .

Seawater sampling activity log during the period from October 2014 to December 2014

We collected seawater sample at Tomioka by coastal sampling on 24 December 2014. A position was 37.335228 deg. N, 141.031249 deg. E at 0 meters depth and of which the seawater temperature was 11 deg. C and salinity was 32.6. Sample volume was 20L and collected by Aoyama , Inomata and Ishikawa .

We collected seawater sample at Hasaki by coastal sampling on 15 December 2014. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was 14.3 deg. C and salinity was 34.58. Sample volume was 4L and collected by Collaborator .

We collected seawater sample at Tomioka by coastal sampling on 2 December 2014. A position was 37.335228 deg. N, 141.031249 deg. E at 0 meters depth and of which the seawater temperature was 15 deg. C and salinity was 32.4. Sample volume was 20L and collected by Aoyama , Inomata and Ishikawa .

We collected seawater sample at Hasaki by coastal sampling on 17 November 2014. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was 18.4 deg. C and salinity was 34.31. Sample volume was 4L and collected by Collaborator .

We collected seawater sample at Hasaki by coastal sampling on 16 November 2014. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was 18 deg. C and salinity was 34.11. Sample volume was 4L and collected by Collaborator .

We collected seawater sample at Tomioka by coastal sampling on 12 November 2014. A position was 37.335228 deg. N, 141.031249 deg. E at 0 meters depth and of which the seawater temperature was 18 deg. C and salinity was 32.8. Sample volume was 20L and collected by Aoyama , Inomata and Ishikawa .

We collected seawater sample at Hasaki by coastal sampling on 4 November 2014. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was 18.8 deg. C and salinity was 33.24. Sample volume was 4L and collected by Collaborator .

We collected seawater sample at Tomioka by coastal sampling on 21 October 2014. A position was 37.335228 deg. N, 141.031249 deg. E at 0 meters depth and of which the seawater temperature was 19 deg. C and salinity was 32.8. Sample volume was 40L and collected by Aoyama , Inomata and Ishikawa .

We collected seawater sample at Hasaki by coastal sampling on 20 October 2014. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was 19.7 deg. C and salinity was 31.3. Sample volume was 4L and collected by Collaborator .

We collected seawater sample at Hasaki by coastal sampling on 5 October 2014. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was 21.4 deg. C and salinity was 31.6. Sample volume was 4L and collected by Collaborator .

We collected seawater sample at Tomioka by coastal sampling on 3 October 2014. A position was 37.335228 deg. N, 141.031249 deg. E at 0 meters depth and of which the seawater temperature was 22 deg. C and salinity was 32.6. Sample volume was 20L and collected by Aoyama and Inomata .

Seawater sampling activity log during the period from July 2014 to September 2014

We collected seawater sample at Hasaki by coastal sampling on 22 September 2014. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was 22.1 deg. C and salinity was 32.38. Sample volume was 4L and collected by Collaborator .

We collected seawater sample at Tomioka by coastal sampling on 18 September 2014. A position was 37.335228 deg. N, 141.031249 deg. E at 0 meters depth and of which the seawater temperature was 30 deg. C and salinity was . Sample volume was 80L and collected by Aoyama , Inomata and Sakuma, Ishikawa, Nkamura, Kokubun .

We collected seawater sample at Tomioka by coastal sampling on 18 September 2014. A position was 37.335228 deg. N, 141.031249 deg. E at 0 meters depth and of which the seawater temperature was 27 deg. C and salinity was 34. Sample volume was 100L and collected by Aoyama , Inomata and Hayakawa .

We collected seawater sample at Hasaki by coastal sampling on 8 September 2014. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was 22.7 deg. C and salinity was 32.82. Sample volume was 4L and collected by Collaborator .

We collected seawater sample at Tomioka by coastal sampling on 2 September 2014. A position was 37.335228 deg. N, 141.031249 deg. E at 0 meters depth and of which the seawater temperature was 26 deg. C and salinity was 30.4. Sample volume was 20L and collected by Aoyama , Inomata and Ishikawa .

We collected seawater sample at Hasaki by coastal sampling on 24 August 2014. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was 22.6 deg. C and salinity was 33. Sample volume was 4L and collected by Collaborator .

We collected seawater sample at Tomioka by coastal sampling on 21 August 2014. A position was 37.335228 deg. N, 141.031249 deg. E at 0 meters depth and of which the seawater temperature was 25 deg. C and salinity was 32.6. Sample volume was 20L and collected by Aoyama and Inomata .

We collected seawater sample at Hasaki by coastal sampling on 11 August 2014. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was 18.5 deg. C and salinity was 33.33. Sample volume was 4L and collected by Collaborator .

We collected seawater sample at Tomioka by coastal sampling on 6 August 2014. A position was 37.335228 deg. N, 141.031249 deg. E at 0 meters depth and of which the seawater temperature was 24 deg. C and salinity was 33.1. Sample volume was 20L and collected by Aoyama , Inomata and Ishikawa .

We collected seawater sample at Hasaki by coastal sampling on 28 July 2014. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was 22.7 deg. C and salinity was 32.45. Sample volume was 4L and collected by Collaborator .

We collected seawater sample at Tomioka by coastal sampling on 22 July 2014. A position was 37.335228 deg. N, 141.031249 deg. E at 0 meters depth and of which the seawater temperature was 23 deg. C and salinity was 29.2. Sample volume was 20L and collected by Aoyama .

We collected seawater sample at Tomioka by coastal sampling on 14 July 2014. A position was 37.335228 deg. N, 141.031249 deg. E at 0 meters depth and of which the seawater temperature was 20.5 deg. C and salinity was 33.2. Sample volume was 82L and collected by Aoyama , Inomata and Ishikawa .

We collected seawater sample at Hasaki by coastal sampling on 14 July 2014. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was 19.3 deg. C and salinity was 33.01. Sample volume was 4L and collected by Collaborator .

We collected seawater sample at Hasaki by coastal sampling on 1 July 2014. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was 21.6 deg. C and salinity was 30.6. Sample volume was 4L and collected by Collaborator .

Seawater sampling activity log during the period from April 2014 to June 2014

Figure Sampling at Hasaki on 9 June 2014

We collected seawater sample at Tomioka by coastal sampling on 23 June 2014. A position was 37.335228 deg. N, 141.031249 deg. E at 0 meters depth and of which the seawater temperature was 22.5 deg. C and salinity was 30. Sample volume was 61L and collected by Aoyama .

We collected seawater sample at Tomioka by coastal sampling on 10 June 2014. A position was 37.335228 deg. N, 141.031249 deg. E at 0 meters depth and of which the seawater temperature was deg. C and salinity was . Sample volume was 20L and collected by Aoyama , Inomata and .

We collected seawater sample at Hasaki by coastal sampling on 9 June 2014. A position was 35.841966 deg. N, 140.763474 deg. E at 0 meters depth and of which the seawater temperature was deg. C and salinity was . Sample volume was 4L and collected by Collaborator .