海表动量和热量通量的数值模拟

本文分析了用IAP两层大气环流模式模拟的海表动量和热量通量,并将其同Han等和Esbensen等的气候资料比较.模拟的热量通量与观测估计值有类似的水平分布和季节变化,但在中低纬地区有偏多的热量由海洋向大气输送,尤其1月北半球中纬大气需要从海洋获得过分多的热量;模拟的海表动量通量和气候估计值也类似,但模拟的北半球冬季中高纬西风动量通量中心位置偏东,赤道中西太平洋和大西洋的东风动量通量偏弱,南半球环绕南极的西风带模拟得过分弱(尤其在7月份).本文还检验了基本变量的日变化和日际变化对计算海表动量和湍流扩散热量通量的影响,结果表明用月平均,日平均和每小时的基本量计算的动量和湍流扩散热量通量依次增大,尤其在中高纬地区更明显.

Numerical Simulation of Sea Surface Momentum and Heat Fluxes

The sea surface heat and momentum fluxes simulated by using the IAP Two-Level Atmospheric General Circulation Model are analyzed in this paper. In comparison with the climatological estimates, the simulated surface fluxes are fairly good in their global patterns and seasonal features although the model atmosphere aquires too much heat from the ocean of middle-low latitudes in the Northern winter and the model's Antarctic circumpolar westerly momentum is too weak.Besides these, the impact of diurnal and interdiurnal variabilities of the basic variables on the estimates of the momentum and heat fluxes are discussed based on both the model output and ECMWF analysis.