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IPRC Convection Scheme in the WRF Model

IPRC Convection Scheme in the WRF Model. C. Zhang, Y. Wang, and K. Hamilton ( Monthly Weather Review, 2011).

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IPRC Convection Scheme in the WRF Model

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  1. IPRC Convection Scheme in the WRF Model C. Zhang, Y. Wang, and K. Hamilton (Monthly Weather Review, 2011) Simulating the extensive low clouds over the world’s subtropical oceans has been a particular challenge for numerical climate models. A new parameterization derived from the Tiedtke convective scheme was developed for the IPRC regional Atmospheric Model (iRAM). When this new scheme was implemented in the widely used community Weather Research and Forecasting (WRF) model, results showed that the IPRC scheme produces much more realistic simulations of the extensive low cloud decks off the west coast of South America than three other schemes offered as standard options in WRF. IPRC scientists were therefore invited to implement their scheme into the latest official community version of WRF (version 3.3 released April 2011). The cloud-water mixing ratio (shading) and virtual potential temperature (contours, K) in a section along 20°S, averaged over 5 days during October 2008 simulated by the WRF model with different convection parameterizations: (a) the IPRC parameterization derived from the Tiedtke scheme, (b) the Kain-Frisch scheme, (c) the Betts-Miller-Janjic scheme, (d) the simplified Arakawa-Schubert scheme. The thick contours outline regions of high static stability.

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