Page 241 - 《高原气象》2022年第5期

高 原 气 象 41 卷
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Applicability Evaluation of China’s First Generation of Global Land
Surface Reanalysis（CRA40/Land）Air Temperature and
Precipitation Products in China Mainland

WANG Caixia ，HUANG Anning ，ZHENG Peng ，LIU Kai ，HOU Min 1
1
3
2
4
（1. Tianjin Binhai New Area Bureau of Meteorology，Tianjin 300457，China；
2. School of Atmospheric Sciences，Nanjing University，Nanjing 210023，Jiangsu，China；
3. College of Oceanic and Atmospheric Sience，Ocean University of China，Qingdao 266100，Shandong，China；
4. Shandong Shouxin Project Management Co. Ltd. ，Dezhou 253000，Shandong，China）

Abstract：The applicability of first-generation of Chinese land surface reanalysis dataset（CRA40/Land）has
been evaluated with the observations from 2231 national meteorological stations and further compared with the
ERA5 and CFSR datasets in terms of the spatial and temporal variations of monthly air temperature and precipita‐
tion. Triangulation linear interpolation is used to interpolate grid data into stations，and station data into grid. The
China mainland is divided into four regions according to the stations distribution and topographic features. The bi‐
as，standard deviation ratio，root mean square error（RMSE），correlation coefficient and model skill of the 3 re‐
analysis datasets in four regions are computed to compare the accuracy and evaluate the application. The compar‐
ative results suggest that the CRA40，ERA5 and CFSR datasets can reproduce similar spatio-temporal distribu‐
tion patterns of the monthly air temperature and precipitation with the observations in Mainland of China. In par‐
ticular，they all show much better performance in the eastern China than in western China and in winter than in

summer. For the monthly air temperature，the mean errors of the 3 reanalysis datasets are generally within 2 ℃，
with slightly better performance for the CRA40 and ERA5 datasets. For the monthly precipitation，the errors of
the 3 reanalysis datasets show large differences，the CRA40 performs the best and shows the highest applicability
over Mainland of China among the 3 datasets.
Key words：CRA40；ERA5；CFSR；reanalysis data；applicability evaluation，China