Plateau Meteorology

Plateau Meteorology >

2014 , Vol. 33 >Issue 2: 313 - 322

DOI: https://doi.org/10.7522/j.issn.1000-0534.2013.00177

Simulation Influences of Summer Precipitation by Two Cumulus Parameterization Schemes over Qinghai-Xizang Plateau

  • LUO Xiaoqing ,
  • YANG Meixue ,
  • WANG Xuejia ,
  • WAN Guoning ,
  • CHEN Xiaolei ,
  • LIANG Xiaowen
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  • State Key Laboratory of Cryospheric Sciences Cold and Arid Regions Environmental Engineering Research Institute, Chinese Academy Sciences, Lanzhou 730000, China;2. University of Chinese Academy Sciences, Beijing 100049, China

Received date: 2013-08-21

  Online published: 2014-04-28

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Abstract

The regional climate model RegCM4.0 was used to analyze the impacts of Tiedtke cumulus parameterization scheme and Emanuel scheme on summer precipitation simulation over Qinghai-Xizang Plateau, while JRA25 data and NCEP reanalysis data were used as comparison. The experiment indicated that monthly average precipitation has a complex variation, and precipitation over Southern Qinghai-Xizang Plateau is much larger than Northern. Convective precipitation that accounts for a large proportion in total precipitation, has an obvious daily and monthly variation. Although precipitation simulated by Tiedtke scheme is less than Emanuel scheme, it still has a good performance on daily variation of convective precipitation. Precipitation simulation obviously affected by lower troposphere humidity. Topography has a great impact on water vapor and ascending motion simulation, and except for Southeastern Qinghai-Xizang Plateau where strong ascending motion can reach upper troposphere, the scale of vertical movement in other areas is smaller. The center of Qinghai-Xizang Plateau has net income of water vapor, and the reason why Qilian mountain has more precipitation than surrounding areas is that upper air sinks and lower air rises. The study also revealed that cumulus parameterization scheme based on mass flux has some applicability over Qinghai-Xizang Plateau, but Tiedtke scheme needs great modification, especially to modify the smaller scale convective process for improving simulation ability.

Key words： RegCM4.0; Cumulus parameteriza; Qinghai-Xizang Plate; Precipitation

Cite this article

LUO Xiaoqing , YANG Meixue , WANG Xuejia , WAN Guoning , CHEN Xiaolei , LIANG Xiaowen . Simulation Influences of Summer Precipitation by Two Cumulus Parameterization Schemes over Qinghai-Xizang Plateau[J]. Plateau Meteorology, 2014 , 33(2) : 313 -322 . DOI: 10.7522/j.issn.1000-0534.2013.00177

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