Loop current growth and eddy shedding using models and observations: Analyses of the July 2011 eddy-shedding event

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题名:	Loop current growth and eddy shedding using models and observations: Analyses of the July 2011 eddy-shedding event
作者:	黃如瑤;Xu, F.-H.;Chang, Y.-L.;Oey, L.-Y.;Hamilton, P.
贡献者:	地球科學學院水文與海洋科學研究所
关键词:	Altimetry;Baroclinic instability;Cyclones;Cyclonic circulation;Data assimilation;Deep layer;Earth, ocean, space;Eddies;Eddy current testing;Eddy currents;Empirical analysis;Exact sciences and technology;External geophysics;Gravity;Hypotheses;Loop Current;Marine;Microgravity;Modelling;Ocean circulation;Oceanography;Oceans;Orthogonal functions;Physics of the oceans;Planetary waves;Rossby waves;Shedding;Summer;Thermohaline structure and circulation. Turbulence and diffusion;Trade winds;Upwelling;Velocity;Wave dynamics;Wind
日期:	2013-05-01
上传时间:	2026-04-23 11:08:08 (UTC+8)
出版者:	American Meteorological Society;Boston, MA: American Meteorological Society
摘要:	摘要： Recent studies suggest that as the trade wind in the Caribbean Sea weakens from summer to fall, conditions become more favorable for the Loop Current in the Gulf of Mexico to shed an anticyclonic ring. This idea originated with observations showing a preference for more eddies from summer through fall, and it was confirmed using multidecadal model experiments. Here, the hypothesis is further tested by studying the dynamics of a specific eddy-shedding event in summer 2011 using a model experiment initialized with observation-assimilated reanalysis and forced by reanalysis wind from NCEP. Eddy shedding in July 2011 is shown to follow the weakening of the trade wind and Yucatan transport in late June. The shedding time is significantly earlier than can be explained based on reduced-gravity Rossby wave dynamics. Altimetry and model data are analyzed to show that empirical orthogonal function modes 1 + 2 dominate the reduced-gravity process, while higher modes contain the coupling of the Loop Current with deep layer underneath. The Loop’s westward expansion at incipient shedding induces a deep cyclonic gyre in the eastern Gulf, embedded within which are small cyclones caused by the baroclinic instability of the strongly sheared current north of the Campeche Bank. The associated deep upwelling and upper-layer divergence from these cyclonic circulations accelerate eddy shedding. 出版者： Boston, MA: American Meteorological Society 出版日期： 2013-05-01 出處： Journal of physical oceanography, 2013-05, Vol.43 (5), p.1015-1027 資源來源： Agricultural & Environmental Science Collection 版權： 2015 INIST-CNRS 版權： Copyright American Meteorological Society May 2013 版權： Copyright American Meteorological Society 2013 識別號： ISSN: 0022-3670 識別號： EISSN: 1520-0485 識別號： DOI: 10.1175/JPO-D-12-0138.1 識別號： CODEN: JPYOBT
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