Simulation of the Summer Monsoon Rainfall over East Asia Using the NCEP GFS Cumulus Parameterization at Different Horizontal Resolutions
Authors:
Open Access
- 1 October 2014
- journal article
- Published by American Meteorological Society in Weather and Forecasting
- Vol. 29 (5) , 1143-1154
Abstract
The most recent version of the simplified Arakawa–Schubert (SAS) cumulus scheme in the National Centers for Environmental Prediction (NCEP) Global Forecast System (GFS) (GFS SAS) is implemented in the Weather Research and Forecasting (WRF) Model with a modification of the triggering condition and the convective mass flux in order to make it dependent on the model’s horizontal grid spacing. The East Asian summer monsoon season of 2006 is selected in order to evaluate the performance of the modified GFS SAS scheme. In comparison to the original GFS SAS scheme, the modified GFS SAS scheme shows overall better agreement with the observations in terms of the simulated monsoon rainfall. The simulated precipitation from the original GFS SAS scheme is insensitive to the model’s horizontal grid spacing, which is counterintuitive because the portion of the resolved clouds in a grid box should increase as the model grid spacing decreases. This behavior of the original GFS SAS scheme is alleviated by the modified GFS SAS scheme. In addition, three different cumulus schemes (Grell and Freitas, Kain and Fritsch, and Betts–Miller–Janjić) are chosen to investigate the role of a horizontal resolution on the simulated monsoon rainfall. Although the forecast skill of the surface rainfall does not always improve as the spatial resolution increases, the improvement of the probability density function of the rain rate with the smaller grid spacing is robust regardless of the cumulus parameterization scheme.Keywords
This publication has 39 references indexed in Scilit:
- A scale and aerosol aware stochastic convective parameterization for weather and air quality modelingEGUsphere, 2013
- Next-Generation Numerical Weather Prediction: Bridging Parameterization, Explicit Clouds, and Large EddiesBulletin of the American Meteorological Society, 2012
- Revision of Convection and Vertical Diffusion Schemes in the NCEP Global Forecast SystemWeather and Forecasting, 2011
- Sensitivity of physical parameterizations on prediction of tropical cyclone Nargis over the Bay of Bengal using WRF modelMeteorology and Atmospheric Physics, 2011
- Toward unification of the multiscale modeling of the atmosphereAtmospheric Chemistry and Physics, 2011
- Improving cold season precipitation prediction by the nested CWRF-CFS systemGeophysical Research Letters, 2011
- A sensitivity study of the Regional Climate Model (RegCM3) to the convective scheme with emphasis in central eastern and southeastern EuropeTheoretical and Applied Climatology, 2008
- An Evaluation of a Mass-Flux Cumulus Parameterization Scheme in the KMA Global Forecast SystemJournal of the Meteorological Society of Japan, 2007
- Sensitivity of Hurricane Intensity Forecast to Convective Momentum Transport ParameterizationMonthly Weather Review, 2006
- A generalized approach to parameterizing convection combining ensemble and data assimilation techniquesGeophysical Research Letters, 2002