摘要
基于1993—2017年从卫星高度计资料中识别出来的中尺度涡轨迹数据集,对冬、夏季孟加拉湾涡旋的源地和性质进行了研究。研究表明孟加拉湾西部、安达曼海和孟加拉湾通往赤道的出口处的中尺度涡旋活动呈现显著的季节性差异。安达曼海在冬、夏季从北往南中尺度涡旋分别以"反气旋涡-气旋涡-反气旋涡"和"气旋涡-反气旋涡-气旋涡"的格局分布。不同源区涡旋的季节性生长过程有明显差异。孟加拉湾西部的涡旋在夏季生长迅速但消散缓慢,斯里兰卡冷涡生长缓慢但消散迅速。不同源区涡旋半径和振幅大小有不同的特征。孟加拉湾西部,无论冬、夏季,反气旋涡的振幅、半径都比气旋涡大;夏季季风漂流区,气旋涡半径比反气旋涡小但是振幅比反气旋涡大;安达曼海内无论冬、夏季都是最北侧聚集区涡旋的半径和振幅最大。孟加拉湾内生命史为30~40 d的涡旋数量最多,生命史在100 d以上的涡旋主要分布在孟加拉湾西部。
Distribution of eddy originations and characteristics of eddies in summer and winter in the Bay of Bengal(BOB) from 1993 to 2017 were analyzed based on Mesoscale Eddy Trajectory Atlas Product provided by AVISO. Seasonal variabilities of mesoscale eddies were found mainly in the western BOB, the Andaman Sea and the southern BOB. Eddies in the Andaman Sea distribute from north to south with order of "anticyclones-cyclones-anticyclones" and "cyclones-anticyclones-cyclones" in winter and summer respectively. Growth of eddies has seasonal variabilities and varies from different regions. Eddies in the western BOB intensify rapidly but vanish slowly in summer. Sri Lanka cold eddies intensify slowly but vanish rapidly. Amplitude and radius of eddies are different in different regions. Amplitude and radius of anticyclones are larger than those of cyclones whenever in summer or winter in the western BOB. Radius of anticyclones is larger than that of cyclones near the Southwest Monsoon Current. While, amplitude of anticyclones is smaller than that of cyclones. Amplitude and radius of eddies northernmost are the largest whenever in summer or winter in the Andaman Sea. Eddies with lifetime about 30-40 days are the largest number in the Bay of Bengal. Eddies with long lifetime mainly distribute in the western BOB.
作者
黄挺
周锋
田娣
张家赢
HUANG Ting;ZHOU Feng;TIAN Di;ZHANG Jiaying(State Key Laboratory of Satellite Ocean Environment Dynamics,Hangzhou 310012,China;Second Institute of Oceanography,Ministry of Natural Resources,Hangzhou 310012,China;Ocean College,Zhejiang University,Zhoushan 316021,China)
出处
《海洋学研究》
CSCD
北大核心
2020年第3期21-30,共10页
Journal of Marine Sciences
基金
“全球变化与海气相互作用专项”(二期)(GASI-04-WLHY-03,GASI-01-EIND-STwin)
国家自然科学基金项目(41876026)
自然资源部第二海洋研究所中央级公益性科研院所基本科研业务费专项资金项目(JT1704)
浙江省自然科学杰出青年基金(LR16D060001)。
关键词
孟加拉湾
中尺度涡
季节变化
Bay of Bengal
mesoscale eddy
seasonal variability
