The China Basin-Scale Water Use Efficiency Dataset (CBS-WUE), 2002–2021, 500 m Resolution, Annual and Seasonal

This dataset provides annual and seasonal water use efficiency (WUE) estimates at the basin scale across China from 2002 to 2021. WUE is calculated as the ratio of gross primary production (GPP) to evapotranspiration (ET), with both GPP and ET derived from MODIS remotely sensed vegetation and meteorological data. The dataset contains spatially explicit raster files at 500 m resolution for 25 major Chinese river basins. Annual WUE values are computed as averages over all months (January to December) of each year, while seasonal WUE values are derived from three-month averages for spring (March–May), summer (June–August), autumn (September–November), and winter (December–February).本数据集提供了2002年至2021年中国范围内流域尺度的年度与季节水分利用效率（water use efficiency, WUE）估算结果。其中水分利用效率（WUE）定义为总初级生产力（gross primary production, GPP）与蒸散发（evapotranspiration, ET）的比值，GPP与ET两项参数均由MODIS遥感植被及气象数据反演得到。本数据集包含中国25个主要江河流域的空间显式500米分辨率栅格文件。年度水分利用效率值以各年份1月至12月的月均值计算得到，而季节尺度水分利用效率值则分别基于春季（3月—5月）、夏季（6月—8月）、秋季（9月—11月）与冬季（12月—次年2月）的三个月时段均值推导得出。