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Stratification in the northern Bering Sea in early summer of 2017 and 2018

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Title: Stratification in the northern Bering Sea in early summer of 2017 and 2018
Authors: Ueno, Hiromichi Browse this author →KAKEN DB
Komatsu, Mizuki Browse this author
Ji, Zhaoqianyi Browse this author
Dobashi, Ryo Browse this author
Muramatsu, Miaki Browse this author
Abe, Hiroto Browse this author →KAKEN DB
Imai, Keiri Browse this author →KAKEN DB
Ooki, Atushi Browse this author
Hirawake, Toru Browse this author →KAKEN DB
Keywords: Northern Bering Sea
Interannual variation
In situ data
Issue Date: Dec-2020
Publisher: Elsevier
Journal Title: Deep Sea Research Part II Topical Studies in Oceanography
Volume: 181-182
Start Page: 104820
Publisher DOI: 10.1016/j.dsr2.2020.104820
Abstract: We investigated spatial and interannual variation in the physical environment in the northern Bering Sea focusing on stratification, which is one factor affecting biological production in Arctic/subarctic regions. In particular, we analyzed in situ data obtained onboard the training ship Oshoro Maru in early summer in 2017 and 2018. We found that stratification in the areas just north of St. Lawrence Island (around 64.5 degrees N and west of 168.5 degrees W) and south/southwest of St. Lawrence Island was significantly weaker in 2018 than in 2017. These results are consistent with the extremely low sea-ice extent present in the winter of 2017/2018, which would have resulted in less freshwater being supplied to the surface layers and a warmer and less saline bottom water. Conversely, stratification was as strong in 2018 as in 2017 in the area close to the Alaska mainland, including the Bering Strait area, suggesting that the Alaskan Coastal Water dominates stratification in this area in early summer. Moreover, we found that the weakly stratified water column in the Bering Strait area stratified quickly shortly after the occurrence of strong northerly winds, likely because of the Ekman transport of warm and low-salinity Alaskan Coastal Water from the east.
Rights: © 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 上野 洋路

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