Global Aridity Index and Potential Evapotranspiration (ET0) Climate Database v2

The Global Aridity Index (Global-Aridity_ET0) and Global Reference Evapotranspiration (Global-ET0) Version 2 dataset provides high-resolution (30 arc-seconds) global raster climate data for the 1970-2000 period, related to evapotranspiration processes and rainfall deficit for potential vegetative growth, based upon the implementation of a Penman Monteith Evapotranspiration equation for reference crop. The dataset follows the development and is based upon the WorldClim 2.0: http://worldclim.org/version2<br> Aridity Index represent the ratio between precipitation and ET0, thus rainfall over vegetation water demand (aggregated on annual basis). Under this formulation, Aridity Index values increase for more humid conditions, and decrease with more arid conditions. The Aridity Index values reported within the Global Aridity Index_ET0 geodataset have been multiplied by a factor of 10,000 to derive and distribute the data as integers (with 4 decimal accuracy). This multiplier has been used to increase the precision of the variable values without using decimals.<br>The Global-Aridity_ET0 and Global-ET0 datasets are provided for non-commercial use in standard GeoTiff format, at 30 arc seconds or ~ 1km at the equator.<br>

全球干旱指数（Global Aridity Index，简称Global-Aridity_ET0）与全球参考蒸散量（Global Reference Evapotranspiration，简称Global-ET0）版本2数据集，提供了1970-2000年时段的30弧秒高分辨率全球栅格气候数据，其内容关联潜在植被生长所需的蒸散过程与降水亏缺情况，研发基于参考作物彭曼-蒙特斯蒸散方程的计算实现。本数据集依托WorldClim 2.0开发，详情可访问：http://worldclim.org/version2。
干旱指数为降水量与参考蒸散量的比值，即按年尺度汇总后的降雨量与植被需水量之比。按照该定义，干旱指数数值随环境湿度升高而增大，随干旱程度加剧而降低。Global-Aridity_ET0地理数据集所记录的干旱指数数值已乘以10000倍，以整数形式存储并分发数据（保留4位小数精度），该缩放系数用于在不使用浮点小数的前提下提升变量数值的精度。
Global-Aridity_ET0和Global-ET0数据集以标准GeoTIFF格式提供，分辨率为30弧秒（赤道地区约合1公里），仅可用于非商业用途。

搜集汇总

背景与挑战

背景概述

该数据集提供1970-2000年期间高分辨率（约1公里）的全球干旱指数和潜在蒸散量气候数据，基于Penman Monteith方程计算，用于评估降雨与植被水分需求的平衡。数据以GeoTiff格式存储，适用于非商业用途，主要服务于气候学和农业管理研究。