Regional climate simulations of summer diurnal rainfall variations over East Asia and Southeast China

Wan-Ru Huang, Johnny C.L. Chan, Andie Y.M. Au-Yeung

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1625-1642
Number of pages18
JournalClimate Dynamics
Volume40
Issue number7-8
DOIs
Publication statusPublished - 2013 Jan 1

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regional climate
rainfall
summer
simulation
diurnal variation
climate modeling
cumulus
moisture flux
formation mechanism
temporal evolution
Asia
parameterization
physics
plateau

Keywords

  • Cumulus schemes
  • Diurnal variation
  • Precipitation
  • Regional climate model

ASJC Scopus subject areas

  • Atmospheric Science

Cite this

Regional climate simulations of summer diurnal rainfall variations over East Asia and Southeast China. / Huang, Wan-Ru; Chan, Johnny C.L.; Au-Yeung, Andie Y.M.

In: Climate Dynamics, Vol. 40, No. 7-8, 01.01.2013, p. 1625-1642.

Research output: Contribution to journalArticle

Huang, Wan-Ru ; Chan, Johnny C.L. ; Au-Yeung, Andie Y.M. / Regional climate simulations of summer diurnal rainfall variations over East Asia and Southeast China. In: Climate Dynamics. 2013 ; Vol. 40, No. 7-8. pp. 1625-1642.
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