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| 概要 |
Based on quantitative analyses of fossil diatom assemblages in four Piston Cores, the paleoceanographic changes during the last 340 kyr in the southern Bering Sea and western subarctic Pacific have be...en reconstructed. The total diatom accumulation rate (DAR) in each core is influenced by cold low-salinity surface waters. The cold low-salinity surface waters covered all over the southeast Bering Sea throughout the past 100 kyr, whereas such water masses expanded in the southwest Bering Sea and western subarctic Pacific during the glacial periods. Moreover, based on the changes in major diatoms, a model that predicts a flow through the Aleutian Island is proposed. The flow of the Alaskan Stream waters heads northward through the Aleutian Islands at present. As the climate became colder in the glacials, the shallow eastern and central passes were possibly climinated or restricted due to sea level drop. Therefore, the southeast Bering Sea was isolated from the North Pacific and the southeast Bering Sea was influenced by the Alaskan Stream during the glacial periods.続きを見る
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