Seasonal Characteristics of Circulation in the Southeastern Tropical Indian Ocean
Seasonal Characteristics of Circulation in the Southeastern Tropical Indian Ocean
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DOI：
10.1175/jpo-2682.1
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发表时间：
2004-12
影响因子：
3.5
通讯作者：
T. Qu;G. Meyers
中科院分区：
文献类型：
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作者：
T. Qu;G. Meyers
摘要利用历史温盐资料研究了热带印度洋东南部的环流。一个南移的副热带环流在增加深度占主导地位的年平均环流结构。在印度尼西亚南部海岸附近，海面上有向西的南赤道流（SEC），在10° ~ 11 ° S附近最强，反映了印度尼西亚赤道流（ITF）的强烈影响。在南纬13° ~ 25 °，SEC是一种地下流，其速度核向南加深，在南纬25°处下降到500 m以下。东回旋流（EGC）是覆盖在SEC上的表面流，与近地表温度和盐度的纬向梯度有关。ITF主要在400 m以上向SEC供水，在该深度以下，水流沿着苏门答腊和爪哇海岸反向。季风强烈地迫使环流的年变化。海面动力高度在10° ~ 13 ° S有一个极大值，而深海动力高度在10 ° ~ 13 ° S有一个极大值。
Abstract The circulation in the southeastern tropical Indian Ocean is studied using historical temperature and salinity data. A southward shift of the subtropical gyre at increasing depth dominates the structure of the annual mean circulation. Near the southern Indonesian coast the westward South Equatorial Current (SEC) is at the sea surface and strongest near 10°–11°S, reflecting strong influence of the Indonesian Throughflow (ITF). In latitudes 13°–25°S the SEC is a subsurface flow and its velocity core deepens toward the south, falling below 500 m at 25°S. The eastern gyral current (EGC) is a surface flow overlying the SEC, associated with the meridional gradients of near-surface temperature and salinity. The ITF supplies water to the SEC mainly in the upper 400 m, and below that depth the flow is reversed along the coast of Sumatra and Java. Monsoon winds strongly force the annual variation in circulation. Dynamic height at the sea surface has a maximum amplitude at 10°–13°S, and the maximum at deepe...