*Toru Hirawake¹, Youhei Yamashita², Koji Suzuki², Jun Nishioka³ (1.Faculty of Fisheries Sciences, Hokkaido University, 2.Faculty of Environmental Earth Science, Hokkaido University, 3.Institute of low temperature sciences, Hokkaido University)

*Ueno Hiromichi¹, Ryo Dobashi², Yuki Okada², Takahiro Tanaka³, Jun Nishioka⁴, Toru Hirawake¹, Atsushi Ooki¹, Sachihiko Itoh⁵, Yoshikazu Sasai⁶, Hideharu Sasaki⁶, Ichiro Yasuda⁵ (1.Faculty of Fisheries Sciences, Hokkaido University, 2.Graduate School of Fisheries Sciences, Hokkaido University, 3.Tohoku National Fisheries Research Institute, Japan Fisheries Researh and Education Agency, 4.Institute of Low Temperature Science, Hokkaido University, 5.Atmosphere and Ocean Research Institute, The University of Tokyo, 6.Japan Agency for Marine-Earth Science and Technology)

*Jun Nishioka^1,2, Hajime Obata³, Toru Hirawake^2,4, Youhei Yamashita⁵, Hiroshi Ogawa³, Ichiro Yasuda³ (1.Institute of low temperature sciences, Hokkaido University, 2.Arctic Research Center, Hokkaido University, 3.Atmosphere and Ocean Research Institute, The University of Tokyo, 4.Faculty of Fisheries Sciences, Hokkaido University, 5.Faculty of Environmental Earth Science, Hokkaido University)

*Toru Hirawake¹, Jun Nishioka², Hajime Obata³ (1.Faculty of Fisheries Sciences, Hokkaido University, 2.Institute of low temperature sciences, Hokkaido University, 3.Marine inorganic chemistry division, Atmosphere and Ocean Research Institute, University of Tokyo)

*Joji Oida¹, Toru Hirawake², Youhei Yamashita³, Hiroto Abe², Jun Nishioka⁴, Hisatomo Waga², Daiki Nomura² (1.Graduate School of Fisheries Sciences, Hokkaido University, 2.Faculty of Fisheries Sciences, Hokkaido University, 3.Faculty of Environmental Earth Science, Hokkaido University, 4.Institute of Low Temperature Science, Hokkaido University)

*Toshimasa Doi¹, Satoshi Osafune¹, Shuhei Masuda¹, Hajime Obata⁴, Kazuhiro Misumi³, Jun Nishioka² (1.Japan Agency for Marine-Earth Science and Technology, 2.Hokkaido University, 3.Central Research Institute of Electric Power Industry, 4. The University of Tokyo)