DOI: 10.1007/s00382-011-1170-6
Scopus记录号: 2-s2.0-84859886207
论文题名: Heat balance and eddies in the Peru-Chile current system
作者: Colas F. ; McWilliams J.C. ; Capet X. ; Kurian J.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2012
卷: 39, 期: 2017-01-02 起始页码: 509
结束页码: 529
语种: 英语
英文关键词: Heat Balance
; Oceanic eddies
; Regional climate
; Regional modelling
; South-East Pacific
英文摘要: The Peru-Chile current System (PCS) is a region of persistent biases in global climate models. It has strong coastal upwelling, alongshore boundary currents, and mesoscale eddies. These oceanic phenomena provide essential heat transport to maintain a cool oceanic surface underneath the prevalent atmospheric stratus cloud deck, through a combination of mean circulation and eddy flux. We demonstrate these behaviors in a regional, quasi-equilibrium oceanic model that adequately resolves the mesoscale eddies with climatological forcing. The key result is that the atmospheric heating is large (>50 W m-2) over a substantial strip >500 km wide off the coast of Peru, and the balancing lateral oceanic flux is much larger than provided by the offshore Ekman flux alone. The atmospheric heating is weaker and the coastally influenced strip is narrower off Chile, but again the Ekman flux is not sufficient for heat balance. The eddy contribution to the oceanic flux is substantial. Analysis of eddy properties shows strong surface temperature fronts and associated large vorticity, especially off Peru. Cyclonic eddies moderately dominate the surface layer, and anticyclonic eddies, originating from the nearshore poleward Peru-Chile Undercurrent (PCUC), dominate the subsurface, especially off Chile. The sensitivity of the PCS heat balance to equatorial intra-seasonal oscillations is found to be small. We demonstrate that forcing the regional model with a representative, coarse-resolution global reanalysis wind product has dramatic and deleterious consequences for the oceanic circulation and climate heat balance, the eddy heat flux in particular. © 2011 Springer-Verlag. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/55246
Appears in Collections: 过去全球变化的重建
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作者单位: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States; Laboratoire de Physique des Oceans, Ifremer, Plouzane, France
Recommended Citation:
Colas F.,McWilliams J.C.,Capet X.,et al. Heat balance and eddies in the Peru-Chile current system[J]. Climate Dynamics,2012-01-01,39(2017-01-02)