2000-2019年全球1km地表实际蒸散发

地表实际蒸散发是陆表水循环的关键环节，同时也是能量平衡的重要支出项，且与地表碳收支密切相关，其准确估算不仅对于研究地球系统和全球气候变化具有重要意义，而且对于水资源有效开发利用、农作物需水生产管理、旱情监测和预测、天气预报等方面具有十分重要的应用价值。ETMonitor全球逐日1公里分辨率地表实际蒸散发数据集是基于多参数化、适用于不同土地覆盖类型的地表蒸散发遥感估算模型ETMonitor计算得到，输入数据主要采用的遥感数据包括GLASS产品（叶面积指数、植被覆盖度和反照率）、MODIS产品（地表覆盖、积雪覆盖）、动态地表水体覆盖、ESA CCI土壤水分、GPM降水等，并结合欧洲中期天气预报中心的ERA5全球大气再分析数据等。利用ETMonitor模型在日尺度上估算1公里分辨率像元尺度的植被蒸腾、土壤蒸发、冠层降水截留蒸发、水面蒸发和冰雪升华，并对各分量求和获得逐像元逐日蒸散发量。利用FLUXNET等地面观测数据进行直接验证，估算结果与地面实测数据一致性较好，逐日蒸散发验证RMSE为0.93mm/d，误差为0.08 mm/d，相关系数为0.75。本次发布的ETMonitor全球1公里分辨率地表实际蒸散发数据集覆盖全球，时间步长为每日，空间分辨率为1公里，单位为mm/d，数据类型为整型，缩放系数为0.01，无效值填充-1。使用该数据集时请引用参考文献: Zheng C., Jia L., Hu G. Global Land Surface Evapotranspiration Monitoring by ETMonitor Model Driven by Multi-source Satellite Earth Observations. Journal of Hydrology, 2022, 128444; https://doi.org/10.1016/j.jhydrol.2022.128444.

Actual land surface evapotranspiration (ET) is a critical component of the land surface water cycle, a major outgoing term in the surface energy balance, and closely linked to surface carbon budgets. Its accurate estimation is not only of great significance for studying Earth systems and global climate change, but also holds vital application value for efficient development and utilization of water resources, crop water demand and agricultural production management, drought monitoring and forecasting, weather forecasting, and other relevant fields.

The ETMonitor Global Daily 1-km Resolution Actual Land Surface Evapotranspiration Dataset is calculated based on the multi-parameter remote sensing-based ET estimation model ETMonitor, which is applicable to diverse land cover types. The main remote sensing input datasets include GLASS products (Leaf Area Index, Fraction of Vegetation Cover, and albedo), MODIS products (land cover, snow cover), dynamic surface water cover, ESA CCI soil moisture, GPM precipitation, etc., combined with global atmospheric reanalysis data such as ERA5 from the European Centre for Medium-Range Weather Forecasts (ECMWF).

The ETMonitor model estimates pixel-scale vegetation transpiration, soil evaporation, canopy precipitation interception evaporation, open water evaporation, and snow/ice sublimation at the daily scale for 1-km resolution pixels, and the sum of these components yields the daily actual ET for each individual pixel. Direct validation was conducted using in-situ observational data such as FLUXNET, and the estimated results show good consistency with ground-based measurements: the validation RMSE is 0.93 mm/d, error is 0.08 mm/d, and the correlation coefficient is 0.75.

The newly released ETMonitor global 1-km resolution actual land surface evapotranspiration dataset covers the entire globe, with a daily temporal resolution, spatial resolution of 1 km, unit of mm/d, integer data type, scaling factor of 0.01, and invalid values filled with -1.

Please cite the following reference when using this dataset: Zheng C., Jia L., Hu G. Global Land Surface Evapotranspiration Monitoring by ETMonitor Model Driven by Multi-source Satellite Earth Observations. Journal of Hydrology, 2022, 128444; https://doi.org/10.1016/j.jhydrol.2022.128444.

搜集汇总

背景与挑战

背景概述

该数据集提供2000年至2019年全球陆地每日1公里分辨率的实际蒸散发（ET）数据，基于ETMonitor模型结合多源卫星和气象数据估算，包括植被蒸腾、土壤蒸发等多个组分，验证显示与地面测量高度一致，适用于水文、生态和气候研究。数据以h5格式存储，需遵守引用和版权规定。