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The Characteristics of Summer Precipitation Diurnal Variations in Three Reanalysis Datasets over China

DAI Zejun~(1,3) YU Rucong~2 LI Jian~2 CHEN Haoming~2 1 State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029 2 State Key Laboratory of Severe Weather,Chinese Academy of Meteorological Sciences,Beijing 100081 3 Graduate School of the Chinese Academy of Sciences,Beijing 100039  
The characteristics of summer precipitation diurnal variations in three reanalysis datasets (NCEP,ERA40 and JRA25) over China were analyzed by comparing with those in station rain gauge observations. Results show that the summer precipitation diurnal variations in the three reanalysis products all present obvious deficiencies.Analyzing the percentages of daytime and nighttime rainfall show that the percentage of the daytime(08-20 BT) rainfall to the whole day rainfall is larger than that of nocturnal(20 -08 BT) rainfall in all reanalysis datasets over the most region of China while comparing with the station gauge data.Further analyses demonstrate that the percentage of the morning(08-14 BT) rainfall is the smallest in the station gauge data,but in NCEP and ERA40 products it is obviously more than that in the station observations.The proportion of the daytime rainfall to nocturnal rainfall in NCEP products over Southwest China is almost reverse to that of station rain gauge data.Generally,the diurnal variations of precipitation amount and frequency in JRA25 products and precipitation intensity in NCEP products are closest to the corresponding components in station data,but the nocturnal rainfall over Southwest China is only partly reproduced by ERA40 products.
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