Evaluating the impacts of cumulus, land surface and ocean surface schemes on summertime rainfall simulations over East-to-southeast Asia and the western north pacific by RegCM4

Yu Bin Li, Chi Yung Tam, Wan-Ru Huang, Kevin K.W. Cheung, Zhiqiu Gao

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

This study evaluates the sensitivity of summertime rainfall simulations over East-to-southeast Asia and the western north Pacific in the regional climate model version 4 (RegCM4) to cumulus (including Grell with Arakawa–Schubert type closure, Grell with Fritsch–Chappell type closure, and Emanuel), land surface (Biosphere– atmosphere transfer scheme or BATS, and the community land model or CLM) and ocean surface (referred to as Zeng1, Zeng2 and BATS1e in the model) schemes by running the model with different combinations of these parameterization packages. For each of these experiments, ensemble integration of the model was carried out in the extended boreal summer of May–October from 1998 to 2007. The simulated spatial distribution, intensity and interannual variation of the precipitation, latent heat flux, position of the subtropical high and tropical cyclone genesis patterns from these numerical experiments were analyzed. Examinations show that the combination of Emanuel, CLM and Zeng2 (E-C-Z2) yields the best overall results, consistent with the fact that physical mechanisms considered in E-C-Z2 tend to be more comprehensive in comparison with the others. Additionally, the rainfall quantity is found very sensitive to sea surface roughness length, and the reduction of the roughness length constant (from 2 × 10−4 to 5 × 10−5 m) in our modified BATS1e mitigates the drastic overestimation of latent heat flux and rainfall, and is therefore preferable to the default value for simulations in the western north Pacific region in RegCM4.

Original languageEnglish
Pages (from-to)2487-2505
Number of pages19
JournalClimate Dynamics
Volume46
Issue number7-8
DOIs
Publication statusPublished - 2016 Apr 1

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cumulus
regional climate
land surface
sea surface
climate modeling
rainfall
latent heat flux
simulation
tropical cyclone
surface roughness
biosphere
annual variation
roughness
parameterization
experiment
spatial distribution
Southeast Asia
atmosphere
summer

Keywords

  • Cumulus scheme
  • Land surface model
  • Ocean surface scheme
  • Precipitation
  • Regional climate model

ASJC Scopus subject areas

  • Atmospheric Science

Cite this

Evaluating the impacts of cumulus, land surface and ocean surface schemes on summertime rainfall simulations over East-to-southeast Asia and the western north pacific by RegCM4. / Li, Yu Bin; Tam, Chi Yung; Huang, Wan-Ru; Cheung, Kevin K.W.; Gao, Zhiqiu.

In: Climate Dynamics, Vol. 46, No. 7-8, 01.04.2016, p. 2487-2505.

Research output: Contribution to journalArticle

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