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首页> 外文期刊>Journal of Marine Research >The flow field off southwest India at 8N during the southwest monsoon of August 1993
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The flow field off southwest India at 8N during the southwest monsoon of August 1993

机译：1993年8月西南季风期间印度西南8 N处的流场

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The flow field off the southwest coast of India at 8N was investigated during RV Sonne cruise 89 in August 1993 by direct velocity observations from shipboard- and lowered-ADCP and geostrophic computations from CTD stations. The upper ocean between 75E and 76°52′E near the South Indian shelf was governed by a northward flow with a subsurface velocity maximum of 25 cm s~(-1) at about 100 m depth. This flow, organized as a poleward undercurrent hugging the continental slope, is typical for the southwest monsoon season. The northward transport in August 1993 was 4.7 Sv (1 Sverdrup = 10~6 m~3 s~(-1)) for the upper 300 m from the shipboard ADCP. Earlier geostrophic observations showed southward surface flow above the poleward undercurrent, but in August 1993 the northward flow reached to the surface and in the geostrophy calculations, i.e. without the southward Ekman flow near the surface, there was even no clear subsurface core. The T-S characteristics show that Bay of Bengal Water (BBW) was carried with this flow, and low wind conditions seemed to be connected to the flow of BBW from the southern tip of Sri Lanka toward the southwest coast of India. Further offshore, two meridional current bands were identified in the upper 300 m of the ocean. West of the coastal undercurrent a band of southward flow existed with velocities up to 35 cm s~(-1) above and to the east of the Chagos-Laccadive Ridge, from 72°10′E to 75E. The associated geostrophic transport in the upper 500 m was 5.2 Sv. As the T-S relation was different from that of the northward flow, this current band was not a local recirculation of the poleward undercurrent. Further west, the flow was weak, but intensified toward the central Arabian Sea, between 66E and 69°20′E, where another southward current band was found with velocities of up to 20 cm s~(-1) and a total geostrophic transport for the upper 300 m of -7.2 Sv.
机译：在1993年8月的RV Sonne巡航89期间，通过船上ADCP和降ADCP的直接速度观测以及CTD站的地转计算，研究了印度西南海岸8 N处的流场。南印度大陆架附近75E和76°52'E之间的上层海洋是由北向流控制的，在约100 m深度处的地下速度最大为25 cm s〜（-1）。这种水流以极陆性的逆流包裹着大陆坡，是西南季风季节的典型现象。 1993年8月，北上运输距离船上ADCP的300 m为4.7 Sv（1 Sverdrup = 10〜6 m〜3 s〜（-1））。较早的地转观测表明，向南的地表流动高于极地的暗流，但在1993年8月，向北的流动到达了地表，在地球物理计算中，即在地表附近没有向南的埃克曼流的情况下，甚至没有清晰的地下岩心。 T-S特征表明，孟加拉水湾（BBW）随此流携带，从斯里兰卡的南端到印度西南海岸，低风条件似乎与BBW的流有关。在更远的海上，在海洋的上部300 m中确定了两个子午潮流带。在沿海暗流以西，Chagos-Laccadive山脊以东72°10′至75E之间有一个向南流动的带，速度高达35 cm s〜（-1）。上部500 m的相关地转运动为5.2 Sv。由于T-S关系不同于北向流，因此该电流带不是极向暗流的局部再循环。再往西，流量微弱，但在66E和69°20′E之间流向阿拉伯中部海域，在那里发现了另一个向南的潮流带，速度高达20 cm s〜（-1），总地转运动-7.2 Sv的最高300 m。

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