Preprints
https://doi.org/10.5194/cp-2021-30
https://doi.org/10.5194/cp-2021-30

  03 May 2021

03 May 2021

Review status: this preprint is currently under review for the journal CP.

CHELSA-TraCE21k v1.0. Downscaled transient temperature and precipitation data since the last glacial maximum

Dirk Nikolaus Karger1, Michael P. Nobis1, Signe Normand2, Catherine H. Graham1, and Niklaus E. Zimmermann1 Dirk Nikolaus Karger et al.
  • 1Swiss Federal Research Institute WSL, Zürcherstrasse 111, 8903 Birmensdorf, Switzerland
  • 2Aarhus University, Ny Munkegade 116, 8000 Aarhus, Denmark

Abstract. High resolution, downscaled climate model data are used in a wide variety of applications in environmental sciences. Here we present the CHELSA-TraCE21k downscaling algorithm to create global monthly climatologies for temperature and precipitation at 30 arcsec spatial resolution in 100 year time steps for the last 21,000 years. Paleo orography at high spatial resolution and at each timestep is created by combining high resolution information on glacial cover from current and Last Glacial Maximum (LGM) glacier databases with the interpolation of a dynamic ice sheet model (ICE6G) and a coupling to mean annual temperatures from CCSM3-TraCE21k. Based on the reconstructed paleo orography, mean annual temperature and precipitation was downscaled using the CHELSA V1.2 algorithm. The data were validated by comparisons with the glacial extent of the Laurentide ice shield based on expert delineations, proxy data from Greenland ice cores, historical climate data from meteorological stations, and a dynamic simulation of species a distribution throughout the Holocene. Validations show that CHELSA TraCE21k output creates a reasonable representation of the distribution of temperature and precipitation through time at a high spatial resolution, and simulations based on the data are capable of detecting effective LGM refugia of species.

Dirk Nikolaus Karger et al.

Status: open (extended)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on cp-2021-30: Lorenz et al & adding a caveat emptor for 1km downscaling', John Williams, 11 May 2021 reply
    • AC1: 'Reply on CC1', Dirk N. Karger, 14 May 2021 reply
  • RC1: 'Comment on cp-2021-30', Anonymous Referee #1, 04 Jul 2021 reply

Dirk Nikolaus Karger et al.

Data sets

CHELSA-TraCE21k: Downscaled transient temperature and precipitation data since the last glacial maximum Dirk Nikolaus Karger; Michael P. Nobis; Signe Normand; Catherine H. Graham; Niklaus E. Zimmermann http://dx.doi.org/doi:10.16904/envidat.211

Model code and software

CHELSA_TraCE21k: Version 1.0 Dirk Nikolaus Karger https://doi.org/10.5281/zenodo.4545753

Dirk Nikolaus Karger et al.

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Latest update: 18 Sep 2021
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Short summary
Here we present global monthly climatologies for temperature and precipitation at high spatial resolution for the last 21,000 years. The topography at all time steps is created by combining high resolution information on glacial cover from current and Last Glacial Maximum glacier databases with the interpolation of an ice sheet model and a coupling to mean annual temperatures from a global circulation model.