Statistical characteristics and composed three dimensional structures of mesoscale eddies in the South Indian Ocean

Hu Dong; Chen Xi; Mao Kefeng; Li Yan; Zhang Shouye; Hong Sen

doi:10.3969/j.issn.0253-4193.2017.09.001

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Hu Dong, Chen Xi, Mao Kefeng, Li Yan, Zhang Shouye, Hong Sen. Statistical characteristics and composed three dimensional structures of mesoscale eddies in the South Indian Ocean[J]. Haiyang Xuebao, 2017, 39(9): 1-14. doi: 10.3969/j.issn.0253-4193.2017.09.001

Citation:

Hu Dong, Chen Xi, Mao Kefeng, Li Yan, Zhang Shouye, Hong Sen. Statistical characteristics and composed three dimensional structures of mesoscale eddies in the South Indian Ocean[J]. Haiyang Xuebao, 2017, 39(9): 1-14. doi: 10.3969/j.issn.0253-4193.2017.09.001

Citation:

Hu Dong, Chen Xi, Mao Kefeng, Li Yan, Zhang Shouye, Hong Sen. Statistical characteristics and composed three dimensional structures of mesoscale eddies in the South Indian Ocean[J]. Haiyang Xuebao, 2017, 39(9): 1-14. doi: 10.3969/j.issn.0253-4193.2017.09.001

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Statistical characteristics and composed three dimensional structures of mesoscale eddies in the South Indian Ocean

doi: 10.3969/j.issn.0253-4193.2017.09.001

1.
The 31010 Army of PLA, Beijing 100081, China
2.
College of Meteorology and Oceanography, National University of Defense Technology, Nanjing 211101, China
3.
The 92689 Army of PLA, Zhanjiang 524000, China

Received Date: 2016-09-17
Rev Recd Date: 2016-12-17

Abstract

Abstract

The South Indian Ocean is a region abundant of mesoscale eddies. We analyzed statistical characteristics of mesoscale eddies in the South Indian Ocean(10°-35°S, 50°-120°E) based on merged satellite altimetry data as well as Argo profile data. The results show that eddy frequency is distinctly high in the band area between 18°-30°S; eddy radius tend to increase from the south the north; the radius, eddy kinetic energy, energy intensity and vorticity of long-lived eddies firstly increased and then decreased as eddies evaluate during their lifespans. Most eddies propagate westward while their meridional movement is not significant and long-lived cyclonic eddies (CEs) and anticyclonic eddies (AEs) have poleward (equatorward) deflections, respectively. The mean propagation speed of eddies is 5.9 cm/s and the magnitude present a feature of zonal distribution. Under the mixing layer, CE (AE) represent consistent negative (positive) temperature anomaly and there exist two cold (warn) cores with negative (positive) temperature anomaly, respectively. The salinity structure of CE presented as ‘positive-negative’ salinity anomaly structure, while it is opposite for AE. Eddies' influence on temperature and salinity could reach more than 1 000×10⁴ Pa.
- South Indian Ocean,
- mesoscale eddies,
- statistical characteristics,
- three dimensional structure

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