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CR 80:147-163 (2020)  -  DOI:

Evaluation of net shortwave radiation over China with a regional climate model

Xin Liu1, Yanming Kang1, Qiong Liu1,2, Zijia Guo1, Yonghang Chen1,*, Dizhi Huang1, Chunmei Chen1, Hua Zhang3

1College of Environmental Science and Engineering, Donghua University, Shanghai 201620, PR China
2College of Information Science and Technology, Donghua University, Shanghai 201620, PR China
3State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081, PR China
*Corresponding author:

ABSTRACT: The regional climate model RegCM version 4.6, developed by the European Centre for Medium-Range Weather Forecasts Reanalysis, was used to simulate the radiation budget over China. Clouds and the Earth’s Radiant Energy System (CERES) satellite data were utilized to evaluate the simulation results based on 4 radiative components: net shortwave (NSW) radiation at the surface of the earth and top of the atmosphere (TOA) under all-sky and clear-sky conditions. The performance of the model for low-value areas of NSW was superior to that for high-value areas. NSW at the surface and TOA under all-sky conditions was significantly underestimated; the spatial distribution of the bias was negative in the north and positive in the south, bounded by 25°N for the annual and seasonal averaged difference maps. Compared with the all-sky condition, the simulation effect under clear-sky conditions was significantly better, which indicates that the cloud fraction is the key factor affecting the accuracy of the simulation. In particular, the bias of the TOA NSW under the clear-sky condition was <±10 W m-2 in the eastern areas. The performance of the model was better over the eastern monsoon region in winter and autumn for surface NSW under clear-sky conditions, which may be related to different levels of air pollution during each season. Among the 3 areas, the regional average biases overall were largest (negative) over the Qinghai-Tibet alpine region and smallest over the eastern monsoon region.

KEY WORDS: Regional climate mode · RegCM4.6 · China · Net shortwave radiation

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Cite this article as: Liu X, Kang Y, Liu Q, Guo Z and others (2020) Evaluation of net shortwave radiation over China with a regional climate model. Clim Res 80:147-163.

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