中国1km逐月潜在蒸散发数据集（1901-2024）

数据集为中国逐月潜在蒸散发，空间分辨率为0.0083333°（约1km），时间为1901.1-2024.12，单位为0.1mm。该数据集是基于中国1km逐月均温、最低温、最高温数据集（本站已发布，Peng at al. 2019），采用Hargreaves潜在蒸散发计算式得到（Peng at al. 2017）。公式如下： PET = 0.0023 × S0 ×sqrt(MaxT – MinT)×（MeanT + 17.8）, 其中，PET为潜在蒸散发，mm/月；MaxT、MinT、MeanT分别为月最高温、最低温、均温；S0为到达地球大气层顶的理论太阳辐射，根据太阳常数、日地距离、儒略日、赤纬等计算得到。 为便于存储，数据均为int16型存于nc（NETCDF）文件中。nc数据可用ArcMAP软件打开制图，并可用Matlab、R软件提取处理。数据坐标系统建议使用WGS84。

This dataset provides monthly potential evapotranspiration (PET) over China, with a spatial resolution of 0.0083333° (approximately 1 km), covering the period from January 1901 to December 2024, with the unit of 0.1 mm.

This dataset was generated using the Hargreaves potential evapotranspiration equation (Peng et al., 2017), based on the 1-km monthly mean, minimum, and maximum temperature datasets over China, which were previously released by this platform (Peng et al., 2019). The calculation formula is as follows:
$$ ext{PET} = 0.0023 imes S_0 imes sqrt{ ext{MaxT} - ext{MinT}} imes ( ext{MeanT} + 17.8)$$
where PET is potential evapotranspiration with the unit of mm/month; MaxT, MinT, and MeanT represent monthly maximum air temperature, minimum air temperature, and mean air temperature, respectively; $S_0$ is the extraterrestrial solar radiation, calculated based on solar constant, Earth-Sun distance, solar declination, Julian day, and other relevant parameters.

For efficient storage, all data are stored as int16 type in NetCDF (nc) files. The NetCDF data can be opened and visualized for mapping using ArcMap, and extracted or processed with Matlab or R software. The WGS84 coordinate system is recommended for this dataset.

搜集汇总

背景与挑战

背景概述

该数据集提供了中国范围内1901年1月至2024年12月的逐月潜在蒸散发数据，空间分辨率高达约1公里（0.0083333°），数据以0.1毫米为单位存储，总大小为55.29 GB，采用开放获取方式共享。数据集基于已发布的温度数据，通过Hargreaves公式计算生成，并以NETCDF格式存储，便于使用ArcMap、Matlab或R等工具进行地理分析和处理。