中国流域500m水分利用效率数据集(2002-2021年)

该数据集为中国内陆流域水分利用效率(Water Use Efficiency, WUE)网格数据集,时间跨度为2002年至2021年,主要覆盖范围为中国内陆流域区域。数据集基于MODIS遥感产品,通过集成总初级生产力(GPP)和蒸散发(ET)数据计算得到。WUE表征生态系统单位蒸散发水量所固定的碳量,是评估生态系统水碳耦合效率的核心指标。<br> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;数据集包含年度和季节两种时间尺度的WUE数据，同时提供中国流域范围矢量数据。数据格式提供栅格(.tif)和NetCDF(.nc)两种格式。栅格数据按年度和季节独立存储,年度数据命名规则为ChinaWUE[年份].tif(如ChinaWUE2002.tif),季节数据命名规则为ChinaWUE_[年份]_[季节].tif,分春夏秋季冬季四个文件夹存储;NetCDF文件将所有年度或季节的栅格数据整合为多维数组格式(时间×纬度×经度),文件体积更小,便于网络下载、数据传输和批量时序分析。数据坐标系为WGS84(EPSG:4326),空间分辨率为0.004492°(约500米)。This is a grid dataset of Water Use Efficiency (WUE) for inland basins across China, with a temporal coverage from 2002 to 2021, mainly covering inland basin regions of China. The dataset is developed based on MODIS remote sensing products, and calculated by integrating Gross Primary Productivity (GPP) and Evapotranspiration (ET) data. Water Use Efficiency (WUE) refers to the amount of carbon fixed by the ecosystem per unit of evapotranspiration water, and is a core indicator for evaluating the water-carbon coupling efficiency of ecosystems. The dataset includes WUE data at two temporal scales: annual and seasonal, and also provides vector data of China's basin boundaries. Two data formats are offered: raster (.tif) and NetCDF (.nc). Raster data are stored separately for annual and seasonal scales. The annual data follow the naming convention of ChinaWUE[Year].tif (e.g., ChinaWUE2002.tif), while the seasonal data follow ChinaWUE_[Year]_[Season].tif, and are stored in four folders corresponding to spring, summer, autumn and winter respectively. NetCDF files integrate all annual or seasonal raster data into a multi-dimensional array format (time × latitude × longitude), which features smaller file size and facilitates online downloading, data transmission and batch time-series analysis. The data uses the WGS84 coordinate system (EPSG:4326) with a spatial resolution of 0.004492° (approximately 500 meters).