在低纬高原上的中尺度数值模式研究中,积云参数化方案的设计是极其重要的,而垂直加热廓线和增湿系数的方案设计是Kuo型积云参数化方案中两个重要的问题。本文从垂直加热廓线和增湿系数的角度设计了多种改进的Kuo型积云参数化方案进行数值试验。试验结果表明,垂直加热廓线采用位温法,增湿系数采用指数型定义法的Kuo型改进方案较适合云南低纬高原上的中尺度数值模式;低纬高原上的增湿系数比我国东部沿海及一些平原地区要大;在改进积云参数化方案的基础上考虑低纬高原地形的影响,能进一步提高中尺度数值模式在低纬高原上的模拟效果。

It is very important to design cumulus parameterization schemes in study of mesoscale numerical model over low latitude plateau.Furthermore,the design schemes of the vertical heating profile and the moistening coefficient are two important problems in Kuo type cumulus parameterization schemes.In this paper,we designed various amending cumulus parameterization schemes from the points of the vertical heating profile and the moistening coefficient to make numerical experiments.The experimental result show that θ_se method used in vertical heating profile and index scheme in moistening coefficient are more suitable for mesoscale numerical model over Yunnan low latitude plateau.The moistening coefficient over low latitude plateau is larger than that in eastern coastal regions and on some plains.The simulated effect of mesoscale numerical model over low latitude plateau will be improved after we consider the influence of steep topography of plateau on the base of improving cumulus parameterization scheme.