Effects of adjusting vertical resolution on the eastern equatorial Pacific cold

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Effects of adjusting vertical resolution on the eastern equatorial Pacific cold tongue

The vertical resolution of LICOM1.0 (LASG/IAP Climate System Ocean Model, version 1.0) is adjusted by increasing the level amount within the upper 150 m while keeping the total of levels. It is found that the eastern equatorial Pacific cold tongue is sensitive to the adjustment. Compared with the simulation of the original level scheme, the adjusting yields a more realistic structure of cold tongue extending from the coast of Peru to the equator, as well as a temperature minimum at Costa Rica coast, north of the cold tongue. In the original scheme experiment, the sharp heating by net surface heat flux at the beginning of spin-up leads to a great warming in the eastern equatorial Pacific Ocean. The weak vertical advection due to a too thick mixed layer in the coarse vertical structure also accounts for the warm bias. The fact that most significant improvements of the upper 50 m temperature appear at the region of the thinnest mixed layer indicates the necessity of fine vertical resolution for the eastern equatorial Pacific Ocean. However, the westward extension of equatorial cold tongue, a defeet in the original scheme, gets even more serious in the adjusting scheme due to the intensified vertical velocity and hence vertical advecfion in the central-eastern equatorial Pacific Ocean.水利论文 ?%V"v}+BID

作 者: Wu Fanghua Liu Hailong LI Wei ZHANG Xuehong  
作者单位:Wu Fanghua(State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;Graduate School of the Chinese Academy of Sciences, Beijing 100039, China)水利论文W UwEh5q+@*]%J
Liu Hailong,LI Wei,ZHANG Xuehong(State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China) 
刊 名:海洋学报(英文版)  SCI
英文刊名:ACTA OCEANOLOGICA SINICA 
年,卷(期):2005 24(3) 
分类号:P7 
关键词:ocean general circulation model   vertical resolution   eastern equatorial Pacific Ocean   cold tongue  
机标关键词:equatorial cold tongueequatorial Pacific Oceanvertical resolutionmixed layervertical structuresurface heat fluxClimate Systemlevel schemeOcean Model 
基金项目:中国科学院资助项目,国家重点基础研究发展计划(973计划),国家自然科学基金 
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