| Liao Jiawen,Peng Shiqiu,Wen Xixi. 2020. On the heat budget and water mass exchange in the Andaman Sea. Acta Oceanologica Sinica, 39(7):32－41 |
| On the heat budget and water mass exchange in the Andaman Sea |
| 安达曼海的热收支分析及其水交换研究 |
| Received:February 24, 2020 |
| DOI：10.1007/s13131-019-1627-8 |
| Key words:Andaman Sea heat budget water mass exchange deep water circulation |
| 中文关键词: 安达曼海 热收支 水交换 深层环流 |
| 基金项目:The National Natural Science Foundation of China under contract Nos 41931182, 41521005 and 41676016; Guangdong Key Project under contract No. 2019BT2H594; the Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) under contract Nos GML2019ZD0303 and GML2019ZD0304; the Chinese Academy of Sciences under contract Nos ZDRW-XH-2019-2 and ISEE2018PY05; the Independent Research Project Program of State Key Laboratory of Tropical Oceanography under contract Nos LTOZZ1902 and LTOZZ1802. |
| Author Name | Affiliation | E-mail | | Liao Jiawen | State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | Peng Shiqiu | State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China
Institution of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou, 510301 China
University of Chinese Academy of Sciences, Beijing 100049, China | speng@scsio.ac.cn | | Wen Xixi | State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China | |
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| Abstract: |
| 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. |
| 中文摘要: |
| 本文基于MITgcm高分辨率环流模式结果，对安达曼海海水温盐结构、海峡水交换及深层环流特征等进行了分析和探讨。结果表明，在1000米以下，安达曼海的水团相比孟加拉湾的水团更咸、更暖且更加均匀，这可能主要是安达曼海近1800米处强垂向混合导致的结果。安达曼海与三孟加拉湾之间通过三个主要海峡通道进行水交换，其主要特征为: 北部通道(普雷帕里斯海峡)是孟加拉湾向安达曼海水输运的主要通道，而中间通道（安达曼群岛以南与尼科巴群岛以北）的水输运方向则与之相反；南部通道(格雷特海峡)呈现出四层的水交换特征，是三个海峡通道中净水输运量最小的通道；三个海峡通道的水输运都表现出半年的变化周期。在1000米水深处，整个安达曼海在1月和7月受气旋式环流主导，而4月和10月则以反气旋式环流为主。安达曼海深层环流以及海峡水交换所呈现的半年变化周期很可能与季风转换期间赤道印度洋西风导致的东传下沉开尔文波有关。 |
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