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Advances in Atmospheric Sciences

, Volume 24, Issue 1, pp 35–43 | Cite as

Roles of mesoscale terrain and latent heat release in typhoon precipitation: A numerical case study

  • Li Yunying  (李昀英)
  • Huang Wei  (黄伟)
  • Zhao Jiaozhi  (赵焦枝)
Article

Abstract

The mesoscale orographic effects on typhoon Aere’s precipitation are simulated using an Advanced Regional Eta-coordinate Model (AREM) version 3.0. In particular, the effects of the latent heat release are studied by two comparable experiments: with and without condensational heating. The results show that the typhoon rainfall is tripled by the southeastern China mesoscale terrain, and the condensational heating is responsible for at least half of the increase. One role of the latent heat release is to warm the atmosphere, leading to a depression of the surface pressure, which then causes a larger pressure difference in the zonal direction. This pressure gradient guides the water vapour to flow into the foothills, which in turn amplifies the water vapour flux divergence amplified, causing the typhoon rainfall to increase eventually. The other role of the latent heat release is to make the convection more organized, resulting in a relatively smaller rain area and stronger precipitation.

Key words

latent heat release mesoscale terrain typhoon precipitation numerical modeling 

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Copyright information

© Science Press 2007

Authors and Affiliations

  • Li Yunying  (李昀英)
    • 1
    • 2
  • Huang Wei  (黄伟)
    • 3
  • Zhao Jiaozhi  (赵焦枝)
    • 4
  1. 1.State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina
  2. 2.Institute of MeteorologyPLA University of Science and TechnologyNanjingChina
  3. 3.Shanghai Typhoon InstituteChina Meteorological AdministrationShanghaiChina
  4. 4.Meteorology Center of Beijing MilitaryPLAAFBeijingChina

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