Validation for a tropical belt version of WRF: sensitivity tests on radiation and cumulus convection parameterizations  

作　　者：SUN Bi-Yun BI Xun-Qiang 

机构地区：[1]College of Atmosphere Sciences,Plateau Atmosphere and Environment Key Laboratory of Sichuan Province,Chengdu University of Information Technology,Chengdu,China [2]Climate Change Research Centre,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing,China [3]State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing,China

出　　处：《Atmospheric and Oceanic Science Letters》2019年第3期192-200,共9页大气和海洋科学快报（英文版）

基　　金：supported by the National Key Research Program of China [grant number 2016YFB0200805);the National Natural Science Foundation of China [grant number 41575089]

摘　　要：Version 3.9 of WRF-ARW is run with a tropical belt configuration for a period from 2012 to 2016 in this study. The domain covers the entire tropics between 45°S and 45°N with a spatial resolution of about 45 km. In order to verify two radiation schemes and four cumulus convection schemes, eight experiments are performed with different combinations of physics parameterization schemes. The results show that eight experiments present reasonable spatial patterns of surface air temperature and precipitation in boreal summer, with the spatial correlation coefficient (COR) between simulated and observed temperature exceeding 0.95, and that between simulated and observed precipitation ranges from 0.65 to 0.82. The four experiments with the RRTMG radiation scheme show a better performance than the other four experiments with the CAM radiation scheme. In the four experiments with the RRTMG radiation scheme, the COR between simulated and observed surface air temperature is about 0.98, and that between simulated and observed precipitation ranges from 0.76 to 0.82. Comparatively, the two experiments using the new Tiedtke cumulus parameterization scheme can simulate better diurnal variation of precipitation in boreal summer than the other six experiments. In particular, for the diurnal cycle of precipitation over land and ocean, the experiment using the RRTMG radiation scheme and the new Tiedtke cumulus convection scheme shows that the peaks of precipitation rate appear at 0400 LST and 1600 LST, in agreement with observation.对基本气候态和降水日变化的分析是检验模式模拟性能、理解模式误差来源的重要手段。为了评估出对热带气候模拟效果较好的物理参数化方案组合,本文应用WRF带状区域模式,主要比较了四种积云对流参数化方案:NewTiedtke、Kain-Fritsch、newSAS、Tiedtke,和两种辐射参数化方案:RRTMG和CAM,对热带带状区域的气候模拟结果。研究表明:使用NewTiedtke积云对流参数化方案和RRTMG辐射方案的试验,表现出对气温、降水及降水日变化等综合性最好的模拟性能;NewTiedtke积云对流参数化方案能模拟出较好的降水空间分布和降水日变化位相分布特征;与RRTMG辐射方案相比,CAM辐射方案会使温度模拟偏低,特别是陆地上更明显,这种陆地上的冷偏差可能主要来源于Tmin的模拟偏冷。

关 键 词：WRF model cumulus convection parameterization radiation scheme diurnal cycle of precipitation 

分 类 号：P[天文地球]