Variability of the Somali Current and eddies during the southwest monsoon regimes |
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| Institution: | 1. School of the Earth, Ocean and Environment, University of South Carolina, Columbia, SC 29208, United States;2. Council of Scientific and Industrial Research (CSIR) - National Institute of Oceanography Regional Centre, Visakhapatnam - 530 017, India;1. Zhejiang Ocean University, Zhoushan, Zhejiang 316004, China;2. Key Laboratory of Informalization of Habitat Monitoring and Fishery Resource Conservation Research in the East China Sea of Zhejiang Province, China;3. Beijing Aerospace Titan Technology Co., Ltd., Beijing 100070, China;4. Guangdong Key Laboratory of Ocean Remote Sensing (LORS), Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) State Key Laboratory of Tropical Oceanography (LTO), South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;1. Department of Marine Environmental Engineering, National Kaohsiung Marine University, Kaohsiung, Taiwan;2. Institute of Environmental Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan;1. CSIR-National Institute of Oceanography, Regional Centre, 176 Lawsons Bay Colony, Visakhapatnam, India;2. CSIR-National Institute of Oceanography, Dona Paula, Goa, India |
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| Abstract: | The meso-scale eddies and currents in the Arabian Sea are analyzed using different satellite observations, Simple Oceanic Data Assimilation (SODA) reanalysis, and Ocean Reanalysis System 4 (ORAS4) from 1993 to 2016 to investigate the impacts of Southwest (SW) Monsoon strength on Somali Current (SC) mesoscale circulations such as the Great Whirl (GW), the Socotra Eddy (SE), the Southern Gyre (SG), and smaller eddies. Increased Ekman pumping during stronger SW monsoons strengthens coastal upwelling along the Somali coast. The Arabian Sea basin-wide anticyclonic circulation and presence of the GW form mesoscale circulation patterns favourable to advection of upwelled waters eastward into the central Arabian Sea. In September, after the SW monsoon winds reach peak strength in July and August, a higher number of discrete anticyclonic eddies with higher ( > 20 cm) sea surface height anomalies develop in strong and normal intensity SW monsoon seasons than weaker SW monsoon seasons. |
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