Remote Efects of Tropical Cyclone Wind Forcing over the Western Pacific on the Eastern Equatorial Ocean

被引:2
作者
张荣华 [1 ,2 ]
裴玉华 [1 ,3 ]
陈大可 [1 ]
机构
[1] State Key Laboratory of Satellite Ocean Environment Dynamics,the 2nd Institute of Oceanography, State Oceanic Administration
[2] Earth System Science Interdisciplinary Center, University of Maryland
[3] College of Physical and Environmental Oceanography, Ocean University of China
关键词
tropical cyclone wind forcing; ocean modeling; remote efects; ocean pathway; satellite data;
D O I
暂无
中图分类号
P461.2 [];
学科分类号
0706 ; 070601 ;
摘要
An ocean general circulation model(OGCM)is used to demonstrate remote efects of tropical cyclone wind(TCW)forcing in the tropical Pacific.The signature of TCW forcing is explicitly extracted using a locally weighted quadratic least-squares regression(called as LOESS)method from six-hour satellite surface wind data;the extracted TCW component can then be additionally taken into account or not in ocean modeling,allowing isolation of its efects on the ocean in a clean and clear way.In this paper,seasonally varying TCW fields in year 2008 are extracted from satellite data which are prescribed as a repeated annual cycle over the western Pacific regions of the equator(poleward of 10 N/S);two long-term OGCM experiments are performed and compared,one with the TCW forcing part included additionally and the other not.Large,persistent thermal perturbations(cooling in the mixed layer(ML)and warming in the thermocline)are induced locally in the western tropical Pacific,which are seen to spread with the mean ocean circulation pathways around the tropical basin.In particular,a remote ocean response emerges in the eastern equatorial Pacific to the prescribed of-equatorial TCW forcing,characterized by a cooling in the mixed layer and a warming in the thermocline.Heat budget analyses indicate that the vertical mixing is a dominant process responsible for the SST cooling in the eastern equatorial Pacific.Further studies are clearly needed to demonstrate the significance of these results in a coupled ocean-atmosphere modeling context.
引用
收藏
页码:1507 / 1525
页数:19
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