| An Eddy-Permitting Oceanic General Circulation Model and Its Preliminary Evaluation |
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| 作者姓名： | LIU Hailong ZHANG Xuehong LI Wei YU Yongqiang YU Rucong |
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| 作者单位： | State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics，Institute of Atmospheric Physics，Chinese Academy of Sciences，Beijing 100029，State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics，Institute of Atmospheric Physics，Chinese Academy of Sciences，Beijing 100029，State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics，Institute of Atmospheric Physics，Chinese Academy of Sciences，Beijing 100029，State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics，Institute of Atmospheric Physics，Chinese Academy of Sciences，Beijing 100029，State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics，Institute of Atmospheric Physics，Chinese Academy of Sciences，Beijing 100029 |
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| 基金项目： | Tthe Chinese Academy of Sciences Innovation Program，国家发展基础科学项目，国家发展基础科学项目，国家自然科学基金 |
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| 摘 要： | 1. Introduction The current oceanic general circulation models(GCMs) used in climate studies, especially those serv-ing as component models in coupled GCMs, havean average resolution around 2? (IPCC, 2001). Theoceanic GCMs with relatively coarse resolutions canreproduce the major observed features of the large-scale circulations, but there are some insurmount-able di?culties. It was documented by Gates (1992)that the main defects of the coarse resolution oceanicGCMs include the repres…
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An eddy-permitting oceanic general circulation model and its preliminary evaluation |
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| LIU Hailong,ZHANG Xuehong,LI Wei,YU Yongqiang,YU Rucong.An Eddy-Permitting Oceanic General Circulation Model and Its Preliminary Evaluation[J].Advances in Atmospheric Sciences,2004,21(5):675-690. |
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| Authors: | LIU Hailong ZHANG Xuehong LI Wei YU Yongqiang YU Rucong |
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| Affiliation: | State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 |
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| Abstract: | An eddy-permitting, quasi-global oceanic general circulation model, LICOM (LASG/IAP (State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics) Climate System Ocean Model), with a uniform grid of 0.5°× 0.5° is established.Forced by wind stresses from Hellerman and Rosenstain (1983), a 40-yr integration is conducted with sea surface temperature and salinity being restored to the Levitus 94 datasets. The evaluation of the annual mean climatology of the LICOM control run shows that the large-scale circulation can be well reproduced. A comparison between the LICOM control run and a parallel integration of L30T63, which has the same framework but a coarse resolution, is also made to confirm the impact of resolution on the model performance. On account of the reduction of horizontal viscosity with the enhancement of the horizontal resolution, LICOM improves the simulation with respect to not only the intensity of the large scale circulations, but also the magnitude and structureof the Equatorial Undercurrent and South Equatorial Current. Taking advantage of the fine grid size, the pathway of the Indonesian Throughflow (ITF) is better represented in LICOM than in L30T63. The transport of ITF in LICOM is more convergent in the upper layer. As a consequence, the Indian Ocean tends to get warmer in LICOM. The poleward heat transports for both the global and individual basins are also significantly improved in LICOM. A decomposed analysis indicates that the transport due to the barotropic gyre, which primarily stands for the barotropic effect of the western boundary currents, plays a crucial role in making the difference. |
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| Keywords: | eddy-permitting oceanic general circulation model large-scale circulation |
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