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Project: Regional climate simulations for West Africa: comparison of input bias correction methods

Team: Prof. Dr. Harald Kunstmann (University of Augsburg & Karlsruhe Institute of Technology), Dr. Dominikus Heinzeller (Karlsruhe Institute of Technology)

Research institution: Karlsruhe Institute of Technology, Institute of Meteorology and Climate Research

Abstract: Climate change is one of the most severe challenges to rural Africa in the 21st century. High-resolution regional climate simulations are a key tool to assess the impact of climate and land use change and to help developing effective adaptation and mitigation measures. Such regional climate simulations require global climate models (future projections) as initial and boundary conditions, which are known to exhibit large biases in key physical quantities.

Among the different bias correction methods, two approaches are currently favored by the climate modeling community. These methods rely on present-day comparisons with re-analysis data by different means. This project aims at the development of highly efficient codes to perform the bias correction using both methods. Shared-memory multicore techniques and a hybrid Python/Fortran code are employed for best performance. Subsequently, fully parallelized regional climate simulations will be conducted to evaluate the skills and performance of both methods.

To illustrate the severity of the model bias, the following figures display the monthly average in surface temperature (skin temperature) in January 1979 for West Africa, our region of study. Figure 1 displays data of the European Re-Analysis Interim (ERA-Interim) dataset, Fig. 2 the corresponding data of the Max-Planck Institute for Meteorology Earth System Model (MPI-ESM), and Fig. 3 the bias of the MPI-ESM with respect to ERA-Interim.

Average surface temperature (skintemp [K]) for January 1979, ERA-Interim

Average surface temperature (skintemp [K]) for January 1979, MPI-ESM

Bias [K] of MPI-ESM average surface temperature with respect to ERA-Interim

Last modified 6 years ago Last modified on Nov 2, 2013 12:34:36 PM

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