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Chemical evidence for the origin of the cold water belt along the northeastern coast of Hokkaido |
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| Authors: | Kenshi Kuma Ryohei Sasayama Nanako Hioki Yuichiroh Morita Yutaka Isoda Tohru Hirawake Keiri Imai Takafumi Aramaki Tomohiro Nakamura Jun Nishioka Naoto Ebuchi |
| Institution: | 1. Faculty of Fisheries Sciences, Hokkaido University, Hakodate, Hokkaido, 041-8611, Japan 2. National Institute for Environmental Studies, Tsukuba, Ibaraki, 305-8506, Japan 3. Institute of Low Temperature Science, Hokkaido University, Sapporo, Hokkaido, 060-0819, Japan |
| Abstract: | In the southwestern Okhotsk Sea, the cold water belt (CWB) is frequently observed on satellite images offshore of the Soya Warm Current flowing along the northeastern coast of Hokkaido, Japan, during summertime. It has been speculated that the CWB is upwelling cold water that originates from either subsurface water of the Japan Sea off Sakhalin or bottom water of the Okhotsk Sea. Hydrographic and chemical observations (nutrients, humic-type fluorescence intensity, and iron) were conducted in the northern Japan Sea and southwestern Okhotsk Sea in early summer 2011 to clarify the origin of the CWB. Temperature–salinity relationships, vertical distributions of chemical components, profiles of chemical components against density, and the (NO3 + NO2)/PO4 relationship confirm that water in the CWB predominantly originates from Japan Sea subsurface water. |
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