1-km Monthly Precipitation Climatological Background Field Dataset for the Tarim River Basin (1981-2010)
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DOI:10.3974/geodb.2026.06.07.V1
Published:June. 2026
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Key Words：
Tarim River Basin,CMFD V2,WorldClim,topographic correction,water balance constraint,
Abstract：
The 1-km Monthly Precipitation Climatological Background Field Dataset for the Tarim River Basin (1981-2010) was developed based on the WorldClim 1 km precipitation background field and the multi-year average precipitation from CMFD V2. Firstly, monthly precipitation observations from automatic weather stations within the Tarim River Basin and its surrounding areas were used, combined with terrain similarity weights for spatial residual correction, to improve the representation of topographic precipitation gradients. Subsequently, a water balance method at the headwater regions was employed to estimate the annual total precipitation of the basin, applying a secondary total-amount constraint to the corrected annual precipitation, thereby ensuring consistency between the spatial distribution of precipitation and the regional water balance closure. Validation results indicate that the root mean square error (RMSE) of the corrected annual total precipitation across the entire basin decreased from 107.03 mm to 73.38 mm, the percent bias (PBIAS) decreased from 29.50% to 2.76%, and the correlation coefficient reached 0.82. For the warm season (from April to October), the correlation coefficient for precipitation increased from 0.79 to 0.85, demonstrating significant improvements in both magnitude and spatial distribution compared to the original products. The dataset comprises monthly multi-year average precipitation and annual average precipitation for the period 1981-2010. The data has a spatial resolution of 0.008333° (approximately 1 km) and the unit is mm. The dataset is archived in .tif data format, and consists of 13 data files with data size of 233 MB (compressed into one file with 68.9 MB).
Foundation Item：
Chinese Academy of Sciences (072GJHZ2023086MI); Ministry of Science and Technology of P. R. China (2022xjkk0104)；
Data Citation：
1. 1-km Monthly Precipitation Climatological Background Field Dataset for the Tarim River Basin (1981-2010)[J/DB/OL]. Digital Journal of Global Change Data Repository, 2026. https://doi.org/10.3974/geodb.2026.06.07.V1. .
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