SAMIL大气环流模式海面湍流通量参数化方案研究

将中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室发展的大气环流谱模式SAMIL_R42L26 2.08中的海气通量参数化方案——Louis方案, 与新发展的一种新型近海层湍流通量参数化方案——LGLC方案进行比较和分析。离线测试结果表明, LGLC方案计算的通量结果与观测数据具有更好的一致性, 且由于其区分热力粗糙度和动力粗糙度, 使得对热量通量的计算更加准确。在线测试则证明, 引入LGLC方案的SAMIL模式对洋面风应力、 感热通量、 潜热通量和降水率的模拟能力有了进一步的提高, 尤其对北半球夏季印度季风和南海季风区的降水改善明显。

Air-Sea Turbulent Flux Parameterization Schemes in SAMIL Model

The air－sea flux parameterization scheme (Louis scheme) for the general circulation model (R42L26 2.08) developed at the State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG) in the Institute of Atmospheric Physics (IAP), Chinese Academy Sciences, and a new developed air－sea turbulent flux parameterization scheme (LGLC scheme), have been compared by using offline and online tests. The result for the offline test shows that the calculated flux result with LGLC scheme is more consistent with observational data, in addition, since taking account of the difference between aerodynamic and thermal roughness length, the calculated flux result is more accurate. The online test shows that the SAMIL (Spectral Atmosphere Model of IAP LASG) model coupled with LGLC scheme produces more realistic surface wind stress, sensible heat flux, latent heat flux, and precipitation, especially precipitation over the zone of the Indian monsoon and the South China Sea monsoon in summertime of the Northern Hemisphere. 