“一带一路”及其毗邻区域地表蒸散发数据集(2015)

地表蒸散发既包括土壤和植物表面的水分蒸发和冰雪表面升华，也包括通过植物表面和植物体内的水分蒸腾。地表蒸散过程是土壤–植物–大气系统中水分运动的重要过程。“一带一路”及其毗邻区域地表蒸散发数据集(2015) (ETMonitor_ET_B&R_1km_2015) 是基于地表蒸散发估算ETMonitor模型（胡光成等，2015）计算得到，该模型的特点是多参数化、适用于不同土地覆盖类型。计算过程中主要采用遥感数据包括多源协同定量遥感产品生产系统MuSyQ提供的植被指数和反照率数据、MODIS土地覆盖数据、ASCAT土壤水分数据、以及CMORPH降水数据，结合欧洲中期天气预报中心的ERA-Interim全球大气再分析数据等。基于ETMonitor模型在日尺度上估算植被蒸腾、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日蒸散发量，最终累计获得2015年蒸散发总量。利用黑河流域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。该数据集覆盖范围包括亚洲、非洲、欧洲和大洋洲约170个国家和地区，陆地总面积94,765 km&sup2。该数据集采用Sinusoidal Tile Grid分幅，共138个数据文件（138景，每景一个数据文件），每景覆盖的经纬度范围为10&degX10&deg，空间分辨率为1 km。数据以.hdf标准格式存储，数据量379 MB，压缩后数据量为136 MB。

Land surface evapotranspiration (ET) encompasses water evaporation from soil and plant surfaces, sublimation on ice and snow surfaces, as well as transpiration of water through plant surfaces and within plant tissues. The land surface evapotranspiration process is a critical component of water movement in the soil-plant-atmosphere system. The "Belt and Road Initiative (BRI) and its adjacent regions" land surface evapotranspiration dataset (2015) (ETMonitor_ET_B&R_1km_2015) was calculated using the ETMonitor-based land surface evapotranspiration estimation model (Hu Guangcheng et al., 2015), which features a multi-parametric formulation and is suitable for diverse land cover types. The calculation primarily utilized remote sensing products and reanalysis data, including vegetation index and albedo data from the Multi-source Synergized Quantitative Remote Sensing Product Production System (MuSyQ), MODIS land cover data, ASCAT soil moisture data, CMORPH precipitation data, as well as the ERA-Interim global atmospheric reanalysis dataset from the European Centre for Medium-Range Weather Forecasts (ECMWF). The ETMonitor model was utilized to estimate five components of evapotranspiration at daily scale: vegetation transpiration, soil evaporation, canopy precipitation interception evaporation, open water evaporation, and snow/ice sublimation. Daily total evapotranspiration was derived by summing these components, and the annual total evapotranspiration for 2015 was obtained via cumulative aggregation. Direct validation using ground observation data from the Heihe River Basin showed that the estimated results exhibited good consistency with in-situ measured data. This dataset covers approximately 170 countries and regions across Asia, Africa, Europe and Oceania, with a total land area of 94,765 km². The dataset is tiled using the Sinusoidal Tile Grid, consisting of 138 data files (138 scenes, one file per scene), with each scene covering a 10°×10° geographic extent and a spatial resolution of 1 km. The data is stored in the standard .hdf format, with an uncompressed size of 379 MB and a compressed size of 136 MB.

搜集汇总

背景与挑战

背景概述

该数据集是2015年‘一带一路’及其毗邻区域的地表蒸散发数据，基于ETMonitor模型和多源卫星数据（如MuSyQ、MODIS、ASCAT等）估算，空间分辨率为1km，覆盖约170个国家和地区，总陆地面积约94765 km²，数据格式为.hdf，总大小379 MB。数据集通过地面观测验证，适用于水循环、气象和生态研究。