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‘Thermohaline front’ off the east coast of India and its generating mechanism

机译：印度东海岸的“盐卤前沿”及其产生机制

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摘要

Physical oceanography measurements reveal a strong salinity (0.18 psu km−1) and temperature (0.07 °C km−1) front off the east coast of India in December 1997. T–S diagrams suggest lateral mixing between the fresh water at the coast and the ambient warmer, saltier water. This front seems to be the result of southward advection of fresh and cool water, formed in the northern Bay of Bengal during the monsoon, by the East Indian Coastal Current, as suggested by the large-scale salinity structure in the SODA re-analysis and the anti-cyclonic gyre in the northwestern Bay of Bengal during winter. The data further reveals an offshore front in January, which appears to be the result of a meso-scale re-circulation around an eddy, bringing cold and freshwater from the northern Bay of Bengal further away from the shore. Our cruise data hence illustrates that very strong salinity fronts can appear in the Bay of Bengal after the monsoon, as a result of intense coastal circulation and stirring by eddies.
机译：物理海洋学测量表明，1997年12月印度东海岸前部盐度高（0.18 psu km-1），温度高（0.07°C km-1）。T–S图表明，沿岸淡水和淡水之间存在横向混合。环境温暖，咸水。正如SODA重新分析和分析中的大型盐度结构所表明的那样，这条锋线似乎​​是由东印度洋沿海海流在季风期间在孟加拉湾北部向北平流输送淡水和凉水的结果。冬季在孟加拉西北部湾的反气旋环流。数据进一步揭示了1月份的近海锋面，这似乎是涡旋附近中尺度循环的结果，这使得来自孟加拉湾北部的冷水和淡水远离海岸。因此，我们的航行数据表明，由于强烈的沿海环流和涡流的搅动，季风后孟加拉湾可能出现非常强的盐度前沿。

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