Journal of Marine Sciences ›› 2020, Vol. 38 ›› Issue (3): 21-30.DOI: 10.3969/j.issn.1001-909X.2020.03.003

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Seasonal variations of mesoscale eddy in the Bay of Bengal and its adjacent regions

HUANG Ting1,2, ZHOU Feng*1,2,3, TIAN Di1,2, ZHANG Jiaying1,2   

  1. 1. State Key Laboratory of Satellite Ocean Environment Dynamics, Hangzhou 310012, China;
    2. Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China;
    3. Ocean College, Zhejiang University, Zhoushan 316021, China
  • Received:2020-04-27 Published:2020-09-15

Abstract: 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.

Key words: Bay of Bengal, mesoscale eddy, seasonal variability

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