Regional climate models (RCMs) provide finer-scale simulations than those of Global climate models (GCMs), whilst being forced by the output of the host GCMs. In this study, we examine the influence of various strengths of spectral nudging on the simulation rainfall patterns in Southern Africa. We use the Conformal-Cubic Atmospheric Model (CCAM) as RCM to downscale ERA-interim reanalysis data to a resolution of 50 km in the horizontal over the globe. A scale-selective filter (spectral nudging technique) is used for nudging the CCAM simulations. The filter is applied at length scales of 9000 km, and 4500 km. The model simulations of rainfall are compared against CRUTS3.2. Both the experiments realistically simulate the present day rainfall patterns.
Reference:
Muthige, M.S. and Engelbrecht, F.A. 2016. Impacts of spectral nudging on the simulation of present-day rainfall patterns over southern Africa. 32nd Annual Conference of the South African Society for Atmospheric Sciences (SASAS 2016), 31 October-1 November 2016, Cape Town, South Africa, pp. 92-95
Muthige, M. S., & Engelbrecht, F. A. (2016). Impacts of spectral nudging on the simulation of present-day rainfall patterns over southern Africa. Climate System Analysis Group, University of Cape Town. http://hdl.handle.net/10204/10147
Muthige, Mavhungu S, and Francois A Engelbrecht. "Impacts of spectral nudging on the simulation of present-day rainfall patterns over southern Africa." (2016): http://hdl.handle.net/10204/10147
Muthige MS, Engelbrecht FA, Impacts of spectral nudging on the simulation of present-day rainfall patterns over southern Africa; Climate System Analysis Group, University of Cape Town; 2016. http://hdl.handle.net/10204/10147 .
Paper presented at the 32nd Annual Conference of the South African Society for Atmospheric Sciences (SASAS 2016), 31 October-1 November 2016, Cape Town, South Africa
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