WEDDELL GYRE

被引:150
作者
DEACON, GER
机构
[1] Institute of Oceanographic Sciences, Wormley, Godalming
来源
DEEP-SEA RESEARCH PART A-OCEANOGRAPHIC RESEARCH PAPERS | 1979年 / 26卷 / 09期
关键词
D O I
10.1016/0198-0149(79)90044-X
中图分类号
P7 [海洋学];
学科分类号
0707 ;
摘要
South of 50°S in the Atlantic sector of the Southern Ocean the water at all depths circulates mainly round an elongated gyre, westwards along the continental margin, northwards along the Antarctic Peninsula, and eastwards across the Atlantic Ocean. At its eastern end, in 20 to 30°E, the gyre is completed by southward movement in the deep and bottom layers, but there seems to be little evidence of southward movement near the surface. The boundary region between east and west winds, generally known as the Antarctic divergence, lies in 65 to 70°S, but there are stronger meridional gradients of atmospheric pressure and Ekman water drift some 5° farther north. The deep-water isotherms curve upwards near the maximum Ekman divergence, giving an indication of strong upwelling, but the near-surface isotherms curve downwards, indicating eastward flow. It seems likely that the low temperatures at all depths may be due to eastward flow as well as upwelling. The Antarctic Peninsula geographically contains the western end of the gyre; the factors that control the eastern end are not so clear. Recent studies indicate that the total outflow from the Weddell Sea, mainly in the bottom and deep layers, may be nearly as large as the Gulf Stream transport. Biological as well as physical problems require more information about the horizontal and vertical movements, the exchanges between the westward and eastward currents, and what happens at the eastern end of the gyre. © 1979.
引用
收藏
页码:981 / 995
页数:15
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