Underestimated tropical stratiform precipitation in the National Center for Atmospheric Research (NCAR) Community Climate Model (CCM3)

Details Underestimated tropical stratiform precipitation in the National Center for Atmospheric Research (NCAR) Community Climate Model (CCM3) Underestimated tropical stratiform precipitation in the National Center for Atmospheric Research (NCAR) Community Climate Model (CCM3)

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3124101s&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 24, CiteID L24101

Physics

2

Meteorology And Atmospheric Dynamics: Numerical Modeling And Data Assimilation, Meteorology And Atmospheric Dynamics: Precipitation (1854), Meteorology And Atmospheric Dynamics: Tropical Meteorology

Scientific paper

The ratio between stratiform and convective precipitation simulated by the NCAR CCM3 is examined. Stratiform rain only accounts for about 1.5% of the total rain amount in CCM3 between 20°N and 20°S, far lower than 40% estimated from Tropical Rainfall Measuring Mission (TRMM) data. Preliminary study suggests that the serious underestimation of stratiform precipitation in CCM3 could be responsible for failed simulations of intraseasonal oscillation (ISO) and seasonal migration of the intertropical convergence zone (ITCZ) precipitation across the equator. Sensitivity experiment with artificially enhanced stratiform precipitation indicates that increase of stratiform rain fraction can improve the simulations of ISO and seasonal migration of the ITCZ precipitation. This study suggests that reasonable partition of stratiform and convective precipitation is crucial for a climate model to project realistic climate features.

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