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Regional climate model sensitivities to parametrizations of convection and non-precipitating subgrid-scale clouds over South America

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Abstract

This study provides a first thorough evaluation of the COnsortium for Small scale MOdeling weather prediction model in CLimate Mode (COSMO-CLM) over South America. Simulations are driven by ERA-Interim reanalysis data. Besides precipitation, we examine the surface radiation budget, cloud cover, 2 m temperatures, and the low level circulation. We evaluate against reanalysis data as well as observations from ground stations and satellites. Our analysis focuses on the sensitivity of results to the convective parametrization in comparison to their sensitivity to the representation of non-precipitating subgrid-scale clouds in the parametrization of radiation. Specifically, we compare simulations with a relative humidity versus a statistical subgrid-scale cloud scheme, in combination with convection schemes according to Tiedtke (Mon Weather Rev 117(8):1779–1800, 1989) and from the European Centre for Medium-Range Weather Forecasts Integrated Forecasting System (IFS) cycle 33r1. The sensitivity of simulated tropical precipitation to the parametrizations of convection and subgrid-scale clouds is of similar magnitude. We show that model runs with different subgrid-scale cloud schemes produce substantially different cloud ice and liquid water contents. This impacts surface radiation budgets, and in turn convection and precipitation. Considering all evaluated variables in synopsis, the model performs best with the (both non-default) IFS and statistical schemes for convection and subgrid-scale clouds, respectively. Despite several remaining deficiencies, such as a poor simulation of the diurnal cycle of precipitation or a substantial austral summer warm bias in northern Argentina, this new setup considerably reduces long-standing model biases, which have been a feature of COSMO-CLM across tropical domains.

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Acknowledgments

This paper was developed within the scope of the IRTG 1740/TRP 2011/50151-0, funded by the DFG/FAPESP. Map plots were made using the R package ncdf4Utils (Bhend and Rockel 2011). The authors appreciate observational data provision by the TRMM, ISCCP, NASA/GEWEX, CRU, ECMWF, and INPE/CPTEC. We thank Celso von Randow for his help on the flux tower data and Jürgen Kurths for his encouragement to write this paper. Comments by two anonymous reviewers helped to improve the quality of the manuscript and are gratefully acknowledged.

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Authors and Affiliations

  1. Potsdam Institute for Climate Impact Research, Potsdam, Brandenburg, Germany

    Stefan Lange & Jan Volkholz

  2. Department of Physics, Humboldt University, Berlin, Germany

    Stefan Lange

  3. Institute of Coastal Research, Helmholtz-Zentrum Geesthacht, Geesthacht, Schleswig-Holstein, Germany

    Burkhardt Rockel

  4. Department of Geography, University of California, Santa Barbara, CA, USA

    Bodo Bookhagen

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  1. Stefan Lange
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  2. Burkhardt Rockel
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  3. Jan Volkholz
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  4. Bodo Bookhagen
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Correspondence to Stefan Lange.

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Lange, S., Rockel, B., Volkholz, J. et al. Regional climate model sensitivities to parametrizations of convection and non-precipitating subgrid-scale clouds over South America. Clim Dyn 44, 2839–2857 (2015). https://doi.org/10.1007/s00382-014-2199-0

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  • DOI: https://doi.org/10.1007/s00382-014-2199-0

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