Statistical characteristics and mechanisms of mesoscale eddies in the North Indian Ocean

Chunjian Sun Xidong Wang Anmin Zhang Lianxin Zhang Caixia Shao Guosong Wang

Chunjian Sun, Xidong Wang, Anmin Zhang, Lianxin Zhang, Caixia Shao, Guosong Wang. Statistical characteristics and mechanisms of mesoscale eddies in the North Indian Ocean[J]. Acta Oceanologica Sinica. doi: 10.1007/s13131-021-1969-x
Citation: Chunjian Sun, Xidong Wang, Anmin Zhang, Lianxin Zhang, Caixia Shao, Guosong Wang. Statistical characteristics and mechanisms of mesoscale eddies in the North Indian Ocean[J]. Acta Oceanologica Sinica. doi: 10.1007/s13131-021-1969-x

doi: 10.1007/s13131-021-1969-x

Statistical characteristics and mechanisms of mesoscale eddies in the North Indian Ocean

Funds: The National Key Research and Development Program of China under contract No. 2019YFC1510000; the National Natural Science Foundation of China under contract No. 41976019.
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  • Figure  1.  Schematic currents and surface EKE in the North Indian Ocean during the summer monsoon (a) and winter monsoon (b). The abbreviations are as follows: SC, Somali Current; EAC, East Arabian Current; SMC, Southwest Monsoon Current; NMC, Northeast Monsoon Current; WICC, West India Coastal Current; EICC, East India Coastal Current; GW, Great Whirl; SE, Socotra Eddy; LH (LL), Laccadive high (Laccadive low). The arrows sketch out the direction of currents and the color shading represents the average EKE in July (a) and January (b).

    Figure  2.  The distribution of eddy numbers counted by the generated positions in 1°×1° box. a. Anticyclonic eddies, b. cyclonic eddies.

    Figure  3.  The distribution of eddy frequency and polarity in the north Indian Ocean. a. Eddy frequency, b. eddy polarity.

    Figure  4.  The proportional histograms of eddy lifespan and average radius during the lifespan. Histogram of lifespan (5-days interval) in the AS (a) and BOB (b), histogram of radius (5 km interval) in the AS (c) and BOB (d).

    Figure  5.  Lifespan variation with latitude (a) and longitude (b) in the AS, and lifespan variation with latitude (c) and longitude (d) in the BOB. The color shadings denote the standard deviation of lifespan.

    Figure  6.  Radius variation with latitude (a) and longitude (b) in the AS, and radius variation with latitude (c) and longitude (d) in the BOB. The color shadings denote the standard deviation of radius.

    Figure  7.  Variation of u with latitude (a) and longitude (b), and variation of v with latitude (c) and longitude (d). Positive values refer to eastward and northward. The color shadings denote the standard deviation of u and v.

    Figure  8.  Monthly variation of eddy characteristics in the AS. a. Eddy number, b. lifespan, c. radius, and d. EKE.

    Figure  9.  Monthly variation of eddy characteristics in the BOB. a. Eddy number, b. lifespan, c. radius, and d. EKE.

    Figure  10.  Horizontal distribution of monthly averaged surface EKE.

    Figure  11.  Horizontal distribution of monthly averaged sea surface height anomaly (SSHA)

    Figure  12.  Horizontal distribution of monthly wind stress work.

    Figure  13.  Trajectories of eddies with lifespan longer than 100 days. a–d: AEs, e–h: CEs. The square symbols denote the generated positions, and the diamond symbols refer to the dissipated positions. MAM, March, April, and May; JJA, June, July, and August; SON, September, October, and November; DJF, December, January, and February; AS, Arabian Sea; BOB, Bay of Bengal

    Figure  14.  Time-longitude diagram of multi-year mean annual cycle of SSHA averaged from 10°N to 15°N in the AS (a), averaged from 14°N to18°N in the BOB (b), and SSHA along the north boundary of AS (c). The position numbers are marked in first subplot of Fig. 11.

    Figure  15.  The evolution characteristics of long lifespan eddies in the north Indian Ocean. a, b and c refer to AEs generated in Region A, B, C in diagram f; d and e refer to CEs generated in region D, E in diagram f. AMP, RAD, EKE, WW and EKM refer to amplitude, radius, eddy kinetic energy, the wind stress work and the Ekman pumping vertical velocity, respectively.

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  • 收稿日期:  2021-06-10
  • 录用日期:  2021-09-30
  • 网络出版日期:  2022-03-29

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