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DOI	10.1029/2019JC015712
	Spatiotemporal Variations of Mesoscale Eddies in the Southeast Indian Ocean
	Zhang N.; Liu G.; Liu Q.; Zheng S.; Perrie W.
发表日期	2020
ISSN	21699275
卷号	125 期号:8
英文摘要	Strong eddy activities exist in the Leeuwin Current (LC) and the South Indian Countercurrent (SICC) systems. Through a detailed investigation based on satellite observations, we find a cyclonic preference for eddies with more frequent genesis, longer lifespan, smaller size and stronger intensity in both systems. The evolutions of amplitudes, radii and total vorticities of eddies can be classified as the generation, stable, and decay stages; however, those of the EKE and relative vorticities lack the stable stage, due to planetary vorticity changes related to the meridional deflections, as eddies drift westward. Eddy properties exhibit significant seasonal and interannual variations. In the LC system, more and stronger eddies tend to be generated in winter and in La Niña years; while in the SICC system, eddy properties generally reach their peaks in spring and in years when the negative Southern Annular Mode (SAM) occurs. And eddy intensities in the SICC system are also modulated by ENSO with about a one-year phase lag. Through instability analysis, we find that baroclinic instability is the most dominant contributor to the development of eddies. By contrast, barotropic instability mainly acts to dampen eddies. Advection of EKE makes almost no net contribution when spatially averaged, although it is locally significant. Pressure work and dissipation may be nonnegligible EKE sinks in the LC system. The EKE variations in these two systems have close connections through the westward-propagating baroclinic instability anomalies, which may explain the phase lags between these two systems. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	baroclinic instability; LC system; Mesoscale eddies; SICC system; spatiotemporal variations
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/186721
作者单位	School of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing, Jiangsu, China; Southern Marine Science and Engineering Guangdong Laboratory, Zhuhai, Guangdong, China; Department of Engineering Mathematics and Internetworking, Dalhousie University, Halifax, NS, Canada; Bedford Institute of Oceanography, Fisheries and Oceans Canada, Dartmouth, NS, Canada; State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China; Guangdong Key Laboratory of Coastal Ocean Variability and Disaster Prediction, Guangdong Ocean University, Zhanjiang, China; Department of Oceanography, Dalhousie University, Halifax, NS, Canada
推荐引用方式 GB/T 7714	Zhang N.,Liu G.,Liu Q.,et al. Spatiotemporal Variations of Mesoscale Eddies in the Southeast Indian Ocean[J],2020,125(8).
APA	Zhang N.,Liu G.,Liu Q.,Zheng S.,&Perrie W..(2020).Spatiotemporal Variations of Mesoscale Eddies in the Southeast Indian Ocean.Journal of Geophysical Research: Oceans,125(8).
MLA	Zhang N.,et al."Spatiotemporal Variations of Mesoscale Eddies in the Southeast Indian Ocean".Journal of Geophysical Research: Oceans 125.8(2020).