海洋水平环流输送对印度洋表层盐度的调整机制  

The adjustment mechanism of the surface salinity in the Indian Ocean by oceanic advection

作　　者：许金电 靖春生 蔡尚湛 林新宇 高璐 Xu Jindian;Jing Chunsheng;Cai Shangzhan;Lin Xinyu;Gao Lu(Ocean Dynamics Laboratory,Third Institute of Oceanography,Ministry of Natural Resources,Xiamen 361005,China;Fujian Provincial Key Laboratory of Marine Physical and Geological Processes,Xiamen 361005,China;Haikou Marine Environment Monitoring Station,State Oceanic Administration,Haikou 570311,China)

机构地区：[1]自然资源部第三海洋研究所海洋动力学研究室,福建厦门361005 [2]福建省海洋物理与地质过程重点实验室,福建厦门361005 [3]国家海洋局海口海洋环境监测中心站,海南海口570311

出　　处：《海洋学报》2022年第5期80-91,共12页

基　　金：科技基础资源调查专项(2017FY201402);国家重点研发计划(2016YFC1402607);国家自然科学基金重点项目(42130460);亚洲合作基金(99950410)。

摘　　要：本文利用Argo表层盐度、OSCAR海流等数据,基于盐度收支方程的平流输送项来阐述海洋平流输送对热带印度洋表层盐度的调整作用;利用淡水输运量计算公式揭示6条关键断面海洋平流输送对表层盐度空间结构的调整机制。结果表明,海洋平流将赤道西印度洋和阿拉伯海的高盐水输送到低盐海域的赤道东印度洋和孟加拉湾、安达曼海;将赤道东印度洋和孟加拉湾、安达曼海的低盐水输送到高盐海域的赤道西印度洋、阿拉伯海以及赤道南印度洋海域,起到了调整印度洋盐度基本平衡的作用。断面淡水输运量的分析结果表明,导致苏门答腊岛西部海域的强降水中心与低盐中心不重合,澳大利亚西部海域的强蒸发中心与高盐中心不重合的主要原因是水平环流所致;夏季,来自赤道西印度洋和阿拉伯海的高盐水在西南季风环流的驱动下,入侵孟加拉湾,是导致孟加拉湾夏季表层盐度较高的主要原因。In this study,Argo surface salinity,OSCAR current and other data are used to explore the influence of oceanic advection transport on the surface salinity in the Tropical Indian Ocean based on the advection term of the salinity budget equation.The adjustment mechanism of the spatial structure of surface salinity by oceanic advection is revealed by freshwater transport calculation along 6 key sections.The results show that the oceanic advection which transports the high-salinity water in the Equatorial Western Indian Ocean(EWIO)and the Arabian Sea(AS)to the Equatorial Eastern Indian Ocean(EEIO),the Bay of Bengal(BOB)and the Andaman Sea,and also transports the low-salinity water in the EEIO,the BOB and the Andaman Sea to the EWIO,the AS and the Equatorial Southern Indian Ocean,plays a role in adjusting the basic balance of salinity in the Indian Ocean.The analysis of freshwater transport along sections shows that the inconsistency between the center of high precipitation and low salinity in the western sea area of Sumatra,and the inconsistency between the center of high evaporation and high salinity in the western sea area of Australia,are both caused by oceanic advection.In summer,the high-salinity water in the EWIO and the AS transported by the southwest monsoon forced circulation into the BOB,is the main reason for the high surface salinity in the BOB.

关 键 词：淡水输运量 平流输送 调整机制 表层盐度 印度洋 

分 类 号：P731.27[天文地球—海洋科学] P731.12