TY - JOUR
T1 - Regional climate simulations of summer diurnal rainfall variations over East Asia and Southeast China
AU - Huang, Wan-Ru
AU - Chan, Johnny C.L.
AU - Au-Yeung, Andie Y.M.
PY - 2013
Y1 - 2013
N2 - This study evaluates the performance of RegCM3 (Regional Climate Model Version 3) in simulating the East Asian rainfall, with emphasis on the diurnal variations of rainfall over Southeast China during the 1998-2002 summer (June-August) seasons. The evaluation focuses on the sensitivity of the choice of cumulus parameterizations and model domain. With the right setup, the spatial and temporal evolution of diurnal rainfall over Southeast China, which has not been well simulated by past studies, can be accurately simulated by RegCM3. Results show that the Emanuel cumulus scheme has a more realistic simulation of summer mean rainfall in East Asia, while the GFC (Grell scheme with the Frisch-Chappell convective closure assumption) scheme is better in simulating the diurnal variations of rainfall over Southeast China. The better performance of these two schemes [relative to the other two schemes in RegCM3: the Kuo scheme and the GAS (Grell scheme with the Arakawa-Schubert closure assumption) scheme] can be attributed to the reasonable reproduction of the major formation mechanism of rainfall-the moisture flux convergence-over Southeast China. Furthermore, when the simulation domain covers the entire Tibetan Plateau, the diurnal variations of rainfall over Southeast China are found to exhibit a noticeable improvement without changes in the physics schemes. © 2012 Springer-Verlag.
AB - This study evaluates the performance of RegCM3 (Regional Climate Model Version 3) in simulating the East Asian rainfall, with emphasis on the diurnal variations of rainfall over Southeast China during the 1998-2002 summer (June-August) seasons. The evaluation focuses on the sensitivity of the choice of cumulus parameterizations and model domain. With the right setup, the spatial and temporal evolution of diurnal rainfall over Southeast China, which has not been well simulated by past studies, can be accurately simulated by RegCM3. Results show that the Emanuel cumulus scheme has a more realistic simulation of summer mean rainfall in East Asia, while the GFC (Grell scheme with the Frisch-Chappell convective closure assumption) scheme is better in simulating the diurnal variations of rainfall over Southeast China. The better performance of these two schemes [relative to the other two schemes in RegCM3: the Kuo scheme and the GAS (Grell scheme with the Arakawa-Schubert closure assumption) scheme] can be attributed to the reasonable reproduction of the major formation mechanism of rainfall-the moisture flux convergence-over Southeast China. Furthermore, when the simulation domain covers the entire Tibetan Plateau, the diurnal variations of rainfall over Southeast China are found to exhibit a noticeable improvement without changes in the physics schemes. © 2012 Springer-Verlag.
KW - Cumulus schemes
KW - Diurnal variation
KW - Precipitation
KW - Regional climate model
UR - http://www.scopus.com/inward/record.url?scp=84875757449&partnerID=8YFLogxK
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-84875757449&origin=recordpage
U2 - 10.1007/s00382-012-1457-2
DO - 10.1007/s00382-012-1457-2
M3 - RGC 21 - Publication in refereed journal
SN - 0930-7575
VL - 40
SP - 1625
EP - 1642
JO - Climate Dynamics
JF - Climate Dynamics
IS - 7-8
T2 - European Geosciences Union General Assembly 2012
Y2 - 22 April 2012 through 27 April 2012
ER -