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GEOPHYSICAL RESEARCH LETTERS,
VOL. 33,
L24709,
6 PP., 2006
doi:10.1029/2006GL028026
Convection suppression criteria applied to the MIT cumulus parameterization scheme for simulating the Asian summer monsoon
City U-IAP Laboratory for Atmospheric Sciences and Department of Physics and Materials Science, City University of Hong Kong, Hong Kong
City U-IAP Laboratory for Atmospheric Sciences and Department of Physics and Materials Science, City University of Hong Kong, Hong Kong
Abdus Salam International Centre for Theoretical Physics, Trieste, Italy
Abdus Salam International Centre for Theoretical Physics, Trieste, Italy
It is shown in this study that applying some convection suppression criteria to the MIT or Emanuel cumulus parameterization scheme may significantly improve the performance of a regional climate model to simulate the Asian summer monsoon precipitation, particularly the precipitation over southeastern China and the Mei-yu rainband over the East Asian region. With the original MIT cumulus scheme, the precipitation over the ocean particularly the South China Sea (SCS) region is generally over-estimated, which may result in the under-estimation of precipitation over China. It is found that the relative vorticity criterion (which shuts down the convection when the low-level flow is anticyclonic and stronger than a certain threshold value) has the largest impact on suppressing the over-estimated precipitation over the SCS.
Received 30 August 2006; accepted 22 November 2006; published 29 December 2006.
Citation: (2006), Convection suppression criteria applied to the MIT cumulus parameterization scheme for simulating the Asian summer monsoon, Geophys. Res. Lett., 33, L24709, doi:10.1029/2006GL028026.
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