CHELSA-W5E5 v1.0: W5E5 v1.0 downscaled with CHELSA v2.0

The CHELSA-W5E5 dataset was created to serve as observational climate input data for the impact assessments carried out in phase 3a of the Inter-Sectoral Impact Model Intercomparison Project (ISIMIP3a).<br>Version 1.0 of the CHELSA-W5E5 dataset covers the entire globe (except the Arctic Ocean beyond 84°N) at 30 arcsec horizontal and daily temporal resolution from 1979 to 2016. Data sources of CHELSA-W5E5 are version 1.0 of WFDE5 over land merged with ERA5 over the ocean (W5E5; Lange, 2019; Cucchi et al., 2020), the ERA5 global reanalysis (Hersbach et al. 2020) and the Global Multi-resolution Terrain Elevation Data 2010 (GMTED2010; Danielson and Gersch, 2011).<br>Variables (with short names and units in brackets) included in the CHELSA-W5E5 dataset are Daily Mean Precipitation (pr, kg m-2 s-1), Daily Mean Surface Downwelling Shortwave Radiation (rsds, W m-2), Daily Mean Near-Surface Air Temperature (tas, K), Daily Maximum Near Surface Air Temperature (tasmax, K), Daily Minimum Near Surface Air Temperature (tasmin, K), Surface Altitude (orog, m), and the CHELSA-W5E5 land-sea mask (mask, 1).<br>Version 1.0.1 of this dataset resolved the caveat described at https://data.isimip.org/caveats/6/.<br>Version 1.0.2 added data with coarser resolution (90 arcsec = 1.5 arcmin, 360 arcsec = 6 arcmin, 1800 arcsec = 30 arcmin = 0.5°), which were generated from version 1.0.1 of the 30 arcsec data via spatial aggregation.<br>Version 1.0.3 replaced the 360 arcsec = 6 arcmin resolution data with 300 arcsec = 5 arcmin resolution data. The switch is motivated by feedback from ISIMIP modelers suggesting that non-climate input data are more widely available at 5 arcmin resolution.

CHELSA-W5E5数据集旨在作为ISIMIP3a（跨部门影响模型比较项目）第三阶段a阶段进行的冲击评估的观测气候输入数据。该数据集的1.0版本涵盖了全球范围（除北极洋84°N以北地区外），以30弧秒的水平分辨率和每日时间分辨率，从1979年至2016年。CHELSA-W5E5数据集的数据来源包括WFDE5版本1.0在陆地上的数据与ERA5在海洋上的数据（W5E5；Lange，2019；Cucchi等，2020）的合并，ERA5全球再分析（Hersbach等，2020）以及全球多分辨率地形高程数据2010（GMTED2010；Danielson和Gersch，2011）。该数据集包含的变量（括号内为简称和单位）包括每日平均降水量（pr，kg m^-2 s^-1）、每日平均地表下行短波辐射（rsds，W m^-2）、每日平均近地表空气温度（tas，K）、每日最高近地表空气温度（tasmax，K）、每日最低近地表空气温度（tasmin，K）、地表高程（或og，m）以及CHELSA-W5E5陆地-海洋掩膜（mask，1）。该数据集的1.0.1版本解决了在https://data.isimip.org/caveats/6/所描述的缺陷。1.0.2版本增加了粗分辨率的数据（90弧秒=1.5弧分，360弧秒=6弧分，1800弧秒=30弧分=0.5°），这些数据由1.0.1版本的30弧秒数据通过空间聚合生成。1.0.3版本将360弧秒=6弧分分辨率的 数据替换为300弧秒=5弧分分辨率的 数据。这一变更源于ISIMIP模型员的反馈，他们认为非气候输入数据在5弧分分辨率下更为广泛可用。