CHELSA-TraCE21k – high-resolution (1 km) downscaled transient temperature and precipitation data since the Last Glacial Maximum

Abstract. High-resolution, downscaled climate model data are used in a wide variety of applications across environmental sciences. Here we introduce new, high-resolution dataset, CHELSA-TraCE21k. It is obtained by downscaling TraCE-21k data, using the “Climatologies at high resolution for earth's land surface areas” (CHELSA) V1.2 algorithm with objective to create global monthly climatologies temperature and precipitation 30 arcsec spatial 100-year time steps last 21 000 years. Paleo-orography each step created combining information on glacial cover from current Last Glacial Maximum (LGM) glacier databases interpolations isostasy (ICE-6G_C) coupling mean annual temperatures TraCE21k (Transient Climate Evolution years) based Community System Model version 3 (CCSM3). Based reconstructed paleo-orography, were CHELSA algorithm. The validated comparisons extent Laurentide ice sheet expert delineations, proxy Greenland cores, historical meteorological stations, dynamic simulation species distributions throughout Holocene. Validations show that CHELSA-TraCE21k V1.0 dataset reasonably represents distribution through an unprecedented 1 km resolution, simulations capable detecting known LGM refugia species.