Influence of bias-correcting global climate models for regional climate simulations over the CORDEX-Australasia domain using WRF

Wamahiu, K., Kala, J.ORCID: 0000-0001-9338-2965 and Andrys, J. (2020) Influence of bias-correcting global climate models for regional climate simulations over the CORDEX-Australasia domain using WRF. Theoretical and Applied Climatology, 142 . pp. 1493-1513.

Abstract

Regional climate models (RCMs) are used to dynamically downscale global climate models (GCMs) to provide high-resolution projections of future climate change to better inform policy and decision making at the regional scale. However, biases from GCMs are transferred to RCMs and this can limit the usefulness of the regional climate projections. This paper investigates the influence of bias correcting 4 GCMs from the Coupled Model Intercomparison Project 3, for regional climate simulations over the CORDEX-Australasia domain using Weather Research and Forecasting. The GCM outputs are bias corrected against ERA-Interim reanalysis as a surrogate truth. Results show that over decadal time scales bias correction removes large systematic precipitation and temperature biases. However, bias correction also introduced biases where there were none, introduced biases of the opposite sign, or enhanced existing biases in other regions in some instances. The dynamical mechanisms driving the changes in the biases are explored.

Item Type:	Journal Article
Murdoch Affiliation(s):	Environmental and Conservation Sciences Harry Butler Institute
Publisher:	Springer Verlag
Copyright:	© 2020 Springer Nature Switzerland AG.
URI:	http://researchrepository.murdoch.edu.au/id/eprint/58011

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