1999年夏季白令海陆坡区海流动力分析

利用中国首次北极科学考察白令海调查资料计算了白令海东部陆坡区 58- 60°N范围内海流的流幅、流速和流量 ,并获得如下结论 :(1 )白令海东陆坡区陆坡流由东南向西北变化 ,流速由东南向西北逐渐增加 ,在 58°N处 ,最大流速达到 1 0cm/s,到 60°N处 ,最大流速达到 30cm/s,是历年调查中最高的 ;流幅由东南向西北不断增宽 ,在 58°N处 ,最大流幅约 1 0 0km ,到 60°N处 ,最大流幅达到 2 1 0km ,流量由东南向西北也不断增加 ,在 58°N处 ,最大流量 5 .3Sv ,到 60°N处 ,最大流量达到 1 0 .2Sv ;(2 )陆坡流的近陆架一侧陆坡逆流的北界位置在 58°N处 ,其表层流幅宽度为 70km ,流速达到 5cm/s以上 ,在 59°N处其影响深度可以直达海底 ,,陆坡逆流的流速降低 ,流幅增宽到 1 1 0km ,60°N附近为陆坡逆流的北界 ,未观测到陆坡逆流 ;(3)陆架坡折锋强化了陆坡流。

DYNAMIC ANALYSIS OF CURRENT OVER THE CONTINENTAL SLOPE OF THE EAST BERING SEA IN SUMMER, 1999

Based on CTD data observed in Bering Sea by the Chinese First Arctic Research Expedition from July to September 1999,we analyze the width, speed and flux of current from 58°N to 60°N over the continental slope of the east Bering Sea and draw conclusions as following: (1) In summer,1999, the Bering Slope Current(BSC) enhances west northward, the maximum speed is about 10cm/s near 58°N and up to 30cm/s near 60°N;the width is about 100km near 58°N and increases to about 210km near 60°N; the flux is about 5.3Sv near 58°N and increases to 10.2Sv near 60°N; (2) The inverse flow is east southward between BSC and continent, the width of upper layer is about 70km, speed is about 5cm/s and it extends to the bottom near 58°N, speed decreases and width increases to about 110km near 59°N, this flow is not observed near 60°N; (3)Bering Sea continental break font strengthens the Bering Slope Current.