陆面同化及再分析降水资料在内蒙古地区的适用性

doi:10.13866/j.azr.2021.06.14

Abstract

Abstract:

Monthly precipitation data observed at 115 weather stations in Inner Mongolia during 1982-2018 was compared with land data assimilation and reanalysis precipitation datasets [Famine Early Warning Systems Network (FEWS NET) Land Data Assimilation System (FLDAS), the Fifth Generation of ECMWF Reanalysis (ERA5), China Meteorological Administration, Global Land surface Reanalysis (CRA40/Land), and Global Land Data Assimilation System (GLDAS)]. The reliability of the four precipitation datasets was analyzed and accuracy of monthly variation was also evaluated. The results showed that the four precipitation datasets captured features of precipitation distribution. Precipitation levels decreased from the northeast to west and were lower in winter and higher in summer. By analyzing correlation coefficients, mean absolute errors, mean bias errors, root mean square errors, and Nash-Sutcliffe efficiency coefficients, the four precipitation datasets showed the best performance in summer and the worst performance in winter, and better values in eastern semi-humid and semiarid areas than western arid and extremely arid areas. Compared with ERA5 and GLDAS, FLDAS, and CRA40/Land showed the lowest differences from observed values and the best statistical characteristics. ERA5 data mostly overestimated precipitation in Inner Mongolia during most of the study period, while GLDAS underestimated it. Particularly in winter, GLDAS showed almost no observation capability for snow precipitation, while the newly released FLDAS data performed better. Overall, FLDAS and CRA40/Land precipitation datasets performed best with better statistical power.

Key words: precipitation, land assimilation data, reanalysis data, applicability

SONG Haiqing,ZHU Zhongyuan,LI Yunpeng. Validation of land data assimilation and reanalysis precipitation datasets over Inner Mongolia[J].Arid Zone Research, 2021, 38(6): 1624-1636.

Figures/Tables 11

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气候分区	年均降水/mm	气象站数量
半湿润区	400≤年均降水<800	28
半干旱区	200≤年均降水<400	68
干旱区	100≤年均降水<200	16
极干旱区	年均降水<100	3

资料	相关系数	平均绝对误差	均方根误差	纳什效率系数
FLDAS	0.984^*	3.7578	6.119	0.9607
ERA5	0.9865^*	7.3865	9.1851	0.9116
CRA40/Land	0.9874^*	2.5021	5.0748	0.973
GLDAS	0.9789^*	4.0333	6.4475	0.9564

Validation of land data assimilation and reanalysis precipitation datasets over Inner Mongolia

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