北印度洋中尺度漩涡的特征及其演变

IF 3.8 3区 地球科学 Q1 OCEANOGRAPHY Progress in Oceanography Pub Date : 2024-02-01 DOI:10.1016/j.pocean.2024.103213
Shiva Shankar Manche, Rabindra K. Nayak, Rajesh Sikhakolli, Rajashree V. Bothale, Prakash Chauhan
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引用次数: 0

摘要

中尺度漩涡在海洋中无处不在,在形成湍流,将动量、热量、盐度和营养物质从形成地输送到消散地,以及控制生物地球化学过程和海气交换等方面发挥着重要作用。利用 1993-2021 年卫星测量的日海平面异常,我们研究了北印度洋中尺度漩涡的统计特征。该过程使用了涡度矢量、Okubo-Weiss 速度梯度张量及其阈值和拉格朗日传输等信息。阿拉伯海(AS)大陆边缘及其西侧和东北侧、亚丁湾口、拉克沙德韦普海、孟加拉湾(BOB)西侧边缘和安达曼海被描绘成热点区域。在海盆尺度上,气旋性涡旋(CEs)和反气旋性涡旋(AEs)在安达曼海和孟加拉湾出现的数量相当,其概率分布与其生命周期的函数相似,但在区域范围内则有显著差异。在 AS 的季风期和后季风期以及 BOB 的 1-8 月间,CE 相对于 AE 占主导地位。相比之下,AEs 在季风期的大漩涡(GW)中表现突出,而 EICC 则在 3 月、7 月和 11 月达到高峰。在研究期间观测到的漩涡总数中,87%为短命漩涡(30 天),10%为中命漩涡(30-60 天),3%为长命漩涡(60 天)。漩涡较小,能量较低,高纬度地区的漩涡寿命比低纬度地区长。漩涡出现的频率有明显的季节性变化,在 AS 和 BOB,漩涡出现的最佳时期分别为 5-8 月和 11-3 月。在弱边界流的背景下,它们还表现出明显的年际振荡和下降趋势。
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Characteristics of mesoscale eddies and their evolution in the north Indian ocean

Mesoscale eddies are ubiquitous in the oceans and play a significant role in setting the turbulence, transporting momentum, heat, salinity, and nutrients from their formation site to the place of dissipation, and controlling biogeochemical processes and air-sea exchanges. Using satellite-measured daily sea level anomaly from 1993 to 2021, we studied statistical characteristics of mesoscale eddies in the north Indian Ocean. The procedure uses information on the vorticity vector, Okubo-Weiss velocity gradient tensor and its threshold, and Lagrange transport. The continental margin of the Arabian Sea (AS) with its western and northeastern flanks, the mouth of the Gulf of Aden, the Lakshadweep Sea, the western margin of the Bay of Bengal (BOB), and the Andaman Sea have been depicted as the hotspot regions. The occurrence of cyclonic eddies (CEs) and anticyclonic eddies (AEs) are comparable in numbers with similar probability distribution as a function of their lifetime in AS and BOB at the basin scale and differ significantly in the regional domains. CEs dominate over AEs during monsoon and post-monsoon periods in the AS and during January-August in the BOB. In contrast, AEs are prominent in the great whirl (GW) during the monsoon period, and the EICC exhibits their peaks in March, July and November. Among the total observed eddies during the study period, 87 % of which are short-lived (<30 days), 10 % are moderately lived (30–60 days), and 3 % are long-lived (>60 days). Eddies are smaller and less energetic, with longer life in the higher latitudes than the lower latitudes. The frequency of eddies exhibits distinct seasonal variability with preferred periods during May-August and November-March, respectively, for their occurrence in AS and BOB. They also show significant inter-annual oscillations and decreasing trends on the background of the weak boundary currents.

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来源期刊
Progress in Oceanography
Progress in Oceanography 地学-海洋学
CiteScore
7.20
自引率
4.90%
发文量
138
审稿时长
3 months
期刊介绍: Progress in Oceanography publishes the longer, more comprehensive papers that most oceanographers feel are necessary, on occasion, to do justice to their work. Contributions are generally either a review of an aspect of oceanography or a treatise on an expanding oceanographic subject. The articles cover the entire spectrum of disciplines within the science of oceanography. Occasionally volumes are devoted to collections of papers and conference proceedings of exceptional interest. Essential reading for all oceanographers.
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