Enhanced eddy kinetic energy in the southeastern Arabian Sea during winter: the influence of surface currents and wind force

IF 3 3区地球科学 Q2 OCEANOGRAPHY

Deep-sea Research Part Ii-topical Studies in Oceanography Pub Date : 2025-09-03 DOI:10.1016/j.dsr2.2025.105537

Ullas M. Pillai , Ajith Joseph K , Roshin P. Raj , Ola M. Johannessen

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Abstract

Eddy kinetic energy (EKE) in the southeastern Arabian Sea (SEAS) during the relatively least explored winter season spanning 28 years (1993–2020) was studied using satellite observational and reanalysis data from the Copernicus Marine Service Data Center. The generation and enhancement of EKE resulting from current instabilities are discussed, and the significant role of barotropic energy conversion in the SEAS, is further examined, considering the roles of surface currents and wind forcing obtained from ERA5 reanalysis dataset. The strong EKE observed during winter within the Laccadive Sea in the SEAS is partly attributed to dominant barotropic instability arising from horizontal shear in surface currents driven by strong negative wind stress curl. Furthermore, EKE shows a significant positive correlation with chlorophyll-a (Chl-a) concentration during winter in the SEAS, highlighting the influence of physical-biological coupling associated with eddies and the zonal advection of Bay of Bengal waters by the northeast monsoon current.

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冬季阿拉伯海东南部涡旋动能增强：海面洋流和风力的影响

利用哥白尼海洋服务数据中心的卫星观测和再分析数据，研究了阿拉伯海东南部（SEAS）相对较少探测的28年冬季（1993-2020年）的涡旋动能（EKE）。本文讨论了洋流不稳定导致的EKE的产生和增强，并结合ERA5再分析数据获得的地表流和风强迫的作用，进一步探讨了正压能量转换在海洋中的重要作用。冬季在南海拉卡迪夫海观测到的强EKE部分归因于强负风应力旋度驱动的地表流水平切变引起的主要正压不稳定。此外，EKE与冬季海洋叶绿素-a （Chl-a）浓度呈显著正相关，突出了东北季风流对孟加拉湾水域涡旋和纬向平流的物理-生物耦合的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Deep-sea Research Part Ii-topical Studies in Oceanography 地学-海洋学

CiteScore

6.40

自引率

16.70%

发文量

115

审稿时长

3 months

期刊介绍： Deep-Sea Research Part II: Topical Studies in Oceanography publishes topical issues from the many international and interdisciplinary projects which are undertaken in oceanography. Besides these special issues from projects, the journal publishes collections of papers presented at conferences. The special issues regularly have electronic annexes of non-text material (numerical data, images, images, video, etc.) which are published with the special issues in ScienceDirect. Deep-Sea Research Part II was split off as a separate journal devoted to topical issues in 1993. Its companion journal Deep-Sea Research Part I: Oceanographic Research Papers, publishes the regular research papers in this area.