Convection suppression criteria applied to the MIT cumulus parameterization scheme for simulating the Asian summer monsoon

Details Convection suppression criteria applied to the MIT cumulus parameterization scheme for simulating the Asian summer monsoon Convection suppression criteria applied to the MIT cumulus parameterization scheme for simulating the Asian summer monsoon

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3324709c&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 24, CiteID L24709

Computer Science

Performance

7

Atmospheric Processes: Climatology (1616, 1620, 3305, 4215, 8408), Atmospheric Processes: Convective Processes, Atmospheric Processes: Model Calibration (1846), Atmospheric Processes: Tropical Meteorology

Scientific paper

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.

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