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Minchao Wu

Researcher

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Representation of precipitation and top-of-atmosphere radiation in a multi-model convection-permitting ensemble for the Lake Victoria Basin (East-Africa)

Author

  • Nicole P.M.van Lipzig
  • Jonas Van de Walle
  • Danijel Belušić
  • Ségolène Berthou
  • Erika Coppola
  • Matthias Demuzere
  • Andreas H. Fink
  • Declan L. Finney
  • Russell Glazer
  • Patrick Ludwig
  • John H. Marsham
  • Grigory Nikulin
  • Joaquim G. Pinto
  • David P. Rowell
  • Minchao Wu
  • Wim Thiery
Show all

Summary, in English

The CORDEX Flagship Pilot Study ELVIC (climate Extremes in the Lake VICtoria basin) was recently established to investigate how extreme weather events will evolve in this region of the world and to provide improved information for the climate impact community. Here we assess the added value of the convection-permitting scale simulations on the representation of moist convective systems over and around Lake Victoria. With this aim, 10 year present-day model simulations were carried out with five regional climate models at both PARameterized (PAR) scales (12–25 km) and Convection-Permitting (CP) scales (2.5–4.5 km), with COSMO-CLM, RegCM, AROME, WRF and UKMO. Most substantial systematic improvements were found in metrics related to deep convection. For example, the timing of the daily maximum in precipitation is systematically delayed in CP compared to PAR models, thereby improving the agreement with observations. The large overestimation in the total number of rainy events is alleviated in the CP models. Systematic improvements were found in the diurnal cycle in Top-Of-Atmosphere (TOA) radiation and in some metrics for precipitation intensity. No unanimous improvement nor deterioration was found in the representation of the spatial distribution of total rainfall and the seasonal cycle when going to the CP scale. Furthermore, some substantial biases in TOA upward radiative fluxes remain. Generally our analysis indicates that the representation of the convective systems is strongly improved in CP compared to PAR models, giving confidence that the models are valuable tools for studying how extreme precipitation events may evolve in the future in the Lake Victoria basin and its surroundings.

Department/s

  • MERGE: ModElling the Regional and Global Earth system
  • Dept of Physical Geography and Ecosystem Science

Publishing year

2023

Language

English

Pages

4033-4054

Publication/Series

Climate Dynamics

Volume

60

Issue

11-12

Document type

Journal article

Publisher

Springer

Topic

  • Earth and Related Environmental Sciences

Keywords

  • Convection permitting simulations
  • CORDEX Flagship Pilot Study
  • Equatorial Africa
  • Extreme weather events
  • Kilometer-scale resolution
  • Lake Victoria basin
  • Regional climate models
  • Tropical deep convection

Status

Published

ISBN/ISSN/Other

  • ISSN: 0930-7575