The characteristics of the T/S structures, water mass exchange and deep circulation in the Andaman Sea are investigated based on the simulation from a high-resolution general circulation model (MITgcm). The results show that, below 1 000 m, the water mass is saltier, warmer and more homogeneous in the Andaman Sea than that in the Bay of Bengal, attributing to the strong vertical mixing at the depth of ∼1 800 m. The water mass exchange between the Andaman Sea and the Bay of Bengal goes through three major channels, which manifests itself as follows: the northern channel (Preparis Channel) is the main passage of water mass transport from the Bay of Bengal to the Andaman Sea, whereas the Middle Channel (the south of Andaman Islands and the north of Nicobar Islands) has an opposite transport; the southern channel (Great Channel) features with a four-layer water exchange which results in the least net transport among the three channels; all the transports through the three channels have an intra-annual variation with a period of half a year. At 1 000-m depth, the entire Andaman Sea is occupied by a cyclonic circulation in January and July while by an anticyclonic one in April and October. The semiannual cycle found in both the deep circulation and water mass exchange is likely associated with the downwelling eastward-propagating Kelvin waves induced by the semiannual westerly component in the equatorial Indian Ocean during intermonsoon seasons.

中文翻译：

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关于安达曼海的热量收支和水质交换

基于高分辨率总环流模型（MITgcm）的模拟，研究了安达曼海的T / S结构，水质交换和深层环流的特征。结果表明，在1000 m以下，与孟加拉湾相比，安达曼海中的水体更咸，更暖和更均匀，这归因于〜1800 m深度的强烈垂直混合。安达曼海和孟加拉湾之间的水质交换主要通过以下三个主要通道进行：北部通道（Preparis通道）是从孟加拉湾到安达曼海的水质传输的主要通道，而中海峡（安达曼群岛的南部和尼科巴群岛的北部）则有相反的运输路线；南部河道（大河道）具有四层水交换功能，这导致三个河道之间的净运输最少。通过这三个渠道的所有运输都有半年的年内变化。在1 000米的深度，整个安达曼海在1月和7月被气旋环流占据，而在4月和10月被反气旋环流占据。在深层环流和水质交换中都发现的半年周期可能与季风季节之间在赤道印度洋的半年半年西风分量引起的向下传播的开尔文波有关。在1 000米的深度，整个安达曼海在1月和7月被气旋环流占据，而在4月和10月被反气旋环流占据。在深层环流和水质交换中都发现的半年周期可能与季风季节之间在赤道印度洋的半年半年西风分量引起的向下传播的开尔文波有关。在1 000米的深度，整个安达曼海在1月和7月被气旋环流占据，而在4月和10月被反气旋环流占据。在深层环流和水质交换中都发现的半年周期可能与季风季节之间在赤道印度洋的半年半年西风分量引起的向下传播的开尔文波有关。