气候变化领域集成服务门户(CCPortal): Eddy morphology: Egg-like shape, overall spinning, and oceanographic implications

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DOI	10.1016/j.rse.2021.112348
	Eddy morphology: Egg-like shape, overall spinning, and oceanographic implications
	Chen G.; Yang J.; Han G.
发表日期	2021
ISSN	00344257
卷号	257
英文摘要	Systematic tracking of individual eddies during their entire lifetimes marks a significant milestone in satellite oceanography over the first two decades of this century. Assuming that the geometry and properties of an oceanic eddy are orientation-sensitive, an angularly aligned composite analysis of over 40 million eddy-focused surface topographic “snapshots” obtained by merging tandem altimeter data from January 1993 through January 2019 reveals that oceanic vortices appear to have a characteristic surface shape of “egg” rather than circle or ellipse as previously understood. Consequently, a second-order moment in eddy morphology is revealed which leads to a ~ 10 km departure from a standard ellipse in terms of major axis. Furthermore, the sharp poles of oceanic eddies exhibit two quasi-orthogonal modes of orientation: primarily meridional and secondarily zonal. The additional submesoscale asymmetry in eddy shape is confirmed by a consistent anisotropy in a normalized eddy-centric velocity field derived from over 25 thousand drifters. The high-order moments in terms of geometric asymmetry and dynamic anisotropy associated with mesoscale eddies (which are found to be statistically significant at 99% level) may have profound geophysical and biological impacts on energy transport, substance entrainment, as well as ecosystem dynamics in the ocean. In particular, it is demonstrated that some of the previously identified patterns in eddy properties obtained by non-rotated normalization may be notably biased due to the ignorance of existing eddy orientation. © 2021 Elsevier Inc.
英文关键词	Altimeter; Morphology; Oceanic eddy
语种	英语
scopus关键词	Anisotropy; Morphology; Velocity; Biological impacts; Characteristic surfaces; Composite analysis; Ecosystem dynamics; Geometric asymmetries; High-order moments; Satellite oceanography; Second order moment; Oceanography; altimeter; asymmetry; ecosystem dynamics; eddy covariance; ellipse; oceanography; satellite altimetry; tracking; Venustaconcha ellipsiformis
来源期刊	Remote Sensing of Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178903
作者单位	Department of Marine Technology, Institute for Advanced Ocean Study, Ocean University of China, China; Pilot National Laboratory for Marine Science and Technology (Qingdao), China
推荐引用方式 GB/T 7714	Chen G.,Yang J.,Han G.. Eddy morphology: Egg-like shape, overall spinning, and oceanographic implications[J],2021,257.
APA	Chen G.,Yang J.,&Han G..(2021).Eddy morphology: Egg-like shape, overall spinning, and oceanographic implications.Remote Sensing of Environment,257.
MLA	Chen G.,et al."Eddy morphology: Egg-like shape, overall spinning, and oceanographic implications".Remote Sensing of Environment 257(2021).