水平分辨率对大洋环流模式模拟性能的影响

Effect of horizontal resolution on computational capability of oceanic general circulation model

通过分析不同水平分辨率海洋模式的模拟结果及其与观测资料的对比,研究了水平分辨率对大洋环流模式模拟性能的影响。在中国科学院大气物理研究所研制的第三代大洋环流模式(L30T63 OGCM)的基础上,提高该模式的水平分辨率,建立了2个版本的全球大洋环流模式。其一,纬向和经向水平分辨率分别为1.5°和1°的全球大洋环流模式(OGCM1);其二,经向水平分辨率为变网格的全球大洋环流模式(OGCM2),其纬向水平分辨率仍为1.5°。分别对L30T63 OGCM和建立的2个版本的大洋环流模式从静止积分100 a。采用相同的动力框架、物理过程、南北边界条件、初始条件以及强迫场对比分析L30T63 OGCM、OGCM1和OGCM2第100年的积分结果。分析结果表明,随着模式水平分辨率的提高,模式计算的整体动能和位能随之增大,模式对上层大洋环流特别是热带上层大洋环流的模拟有明显的改善。

The effect of enhancing horizontal resolution on the computational capability of the oceanic general circulation model（OGCM） was discussed by comparing the simulations of OGCM with different horizontal resolutions by observation.Based on the third generation of oceanic general circulation model（L30T63 OGCM） developed by Institute of Atmospheric Physics,Chinese Academy of Sciences,two different versions of oceanic general circulation models were established by enhancing the horizontal resolution of the model.The first one developed a higher horizontal resolution oceanic general circulation model（OGCM1）, with homogeneous 1.5°×1°horizontal resolution.The second one was a meridional variable-grid oceanic general circulation model（OGCM2）,with the same zonal horizontal resolution as that of OGCM1.The L30T63 OGCM and the other two models were separately integrated for 100 years from the static state.The simulations of L30T63 OGCM,OGCM1 and OGCM2,which possessed the same dynamical frame,physical process,south and north boundary condition,initial condition and precision of the forcing field,were analyzed and contrasted.The results indicate that,with the improvement of the horizontal resolution,the whole kinetic energy and potential energy calculated by the model is increased,and that the simulated global upper ocean circulation,especially in tropics,is improved evidently in the higher resolution model.