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DOI	10.1029/2019JC015483
	Structure and Seasonal Variation of the Indian Ocean Tropical Gyre Based on Surface Drifters
	Wu W.; Du Y.; Qian Y.-K.; Cheng X.; Wang T.; Zhang L.; Peng S.
发表日期	2020
ISSN	21699275
卷号	125 期号:5
英文摘要	Using the Gauss-Markov decomposition method, this study investigates the mean structure and seasonal variation of the tropical gyre in the Indian Ocean based on the observations of surface drifters. In the climatological mean, the clockwise tropical gyre consists of the equatorial Wyrtki Jets (WJs), the South Equatorial Current (SEC), and the eastern and western boundary currents. This gyre system redistributes the water mass over the entire tropical Indian Ocean basin. Its variations are associated with the monsoon transitions, featuring a typical clockwise pattern in the boreal spring and fall seasons. The relative importance of the geostrophic and Ekman components of the surface currents as well as the role of eddy activity were further examined. It was found that the geostrophic component dominates the overall features of the tropical gyre, including the SEC meandering, the broad eastern boundary current, and the axes of the WJs in boreal spring and fall, whereas the Ekman component strengthens the intensity of the WJs and SEC. Eddies are active over the southeastern tropical Indian Ocean and transport a warm and fresh water mass westward, with direct impact on the southern branch of the tropical gyre. In particular, the trajectories of drifters reveal that during strong Indian Ocean Dipole or El Niño-Southern Oscillation events, long-lived eddies were able to reach the southwestern Indian Ocean with a moving speed close to that of the first baroclinic Rossby waves. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Eddy; Indian Ocean; Seasonal Variation; Surface Drifter; Tropical Gyre
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186881
作者单位	State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, China; Southern Marine Science and Engineering Guangdong Laboratory, Guangzhou, China; College of Oceanography, Hohai University, Nanjing, China
推荐引用方式 GB/T 7714	Wu W.,Du Y.,Qian Y.-K.,et al. Structure and Seasonal Variation of the Indian Ocean Tropical Gyre Based on Surface Drifters[J],2020,125(5).
APA	Wu W..,Du Y..,Qian Y.-K..,Cheng X..,Wang T..,...&Peng S..(2020).Structure and Seasonal Variation of the Indian Ocean Tropical Gyre Based on Surface Drifters.Journal of Geophysical Research: Oceans,125(5).
MLA	Wu W.,et al."Structure and Seasonal Variation of the Indian Ocean Tropical Gyre Based on Surface Drifters".Journal of Geophysical Research: Oceans 125.5(2020).