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Effect of winter meteorological conditions on the formation of the cold bottom water in the eastern Bering Sea shelf

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Abstract

The cold bottom water, formed in the previous winter on the eastern Bering Sea shelf, remains throughout the summer. in order to examine the mechanism for the formation of the cold bottom water, we used minimum water temperature in the cold bottom water observed over the eastern Bering Sea shelf for 30 years. The interannual variation in the minimum water temperature of the cold bottom water was closely related to that of mean air temperature during cooling period at St. Paul Island. The air temperature in previous winter primarily affects the cold bottom water. We estimated decrement of the water temperature due to ice melting with simple box model. It was found with the box model that decreasing of the water temperature and lowering of the salinity depend on ice melting. To investigate the cause of interannual variation in air temperature in winter, we applied EOF analysis to the 500 hPa height. The Pacific/North American pattern (PNA) was related to mean air temperature at St. Paul Island in cooling season and the cold bottom water temperature. These results suggest the connection between ENSO events and warming or cooling in the Bering Sea shelf in winter.

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Authors and Affiliations

  1. Faculty of Fisheries, Hokkaido University, 3-1-1 Minato-cho, 041, Hakodate, Japan

    Tomonori Azumaya & Kiyotaka Ohtani

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  1. Tomonori Azumaya
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  2. Kiyotaka Ohtani
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Azumaya, T., Ohtani, K. Effect of winter meteorological conditions on the formation of the cold bottom water in the eastern Bering Sea shelf. J Oceanogr 51, 665–680 (1995). https://doi.org/10.1007/BF02235458

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  • DOI: https://doi.org/10.1007/BF02235458

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