| Numerical Study on Impact of the Boundary Layer Fluxes over Wetland on Sustention and Rainfall of Landfalling Tropical Cyclones |
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| 作者姓名： | LI Ying CHEN Lianshou |
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| 作者单位： | State Key Laboratory of Severe Weather Chinese Academy of Meteorological Sciences，State Key Laboratory of Severe Weather，Chinese Academy of Meteorological Sciences，Beijing 100081，Beijing 100081 |
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| 基金项目： | 国家重点基础研究发展计划(973计划);国家自然科学基金 |
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| 摘 要： | Numerical studies have been carried out to investigate the sustention and intensification of Typhoon Nina (7503), and the impacts of saturated wetland on the sustention and rainfall of tropical cyclone (TC) over land through sensitivity experiments, using the PSU/NCAR non-hydrostatic mesoscale model MM5v3 and its TC bogus scheme. The results show that the vertical transfer of fluxes in the boundary layer over saturated wetland has significant influence on the intensity, structure, and rainfall of a landfalling TC. The latent heating flux and the sensible heating flux are both favourable for TC sustaining and intensification on which the latent heating transfer is more favourable than the sensible heating transfer. They are also favourable for the maintenance of the spiral structure, and have an evident effect on the distribution of TC rainfall. The momentum flux weakens the TC vortex wind fields significantly, and is the dominant factor to dissipate and fill in a low pressure system, while it increases the local precipitation induced by a typhoon.
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| 关 键 词： | 热带气旋 登陆台风 湿地 风力维持 降雨 边界层通量 数值实验研究 |
| 收稿时间： | 1/4/2007 12:00:00 AM |
Numerical Study on Impact of the Boundary Layer Fluxes over Wetland on Sustention and Rainfall of Landfalling Tropical Cyclones |
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| LI Ying,CHEN Lianshou.Numerical Study on Impact of the Boundary Layer Fluxes over Wetland on Sustention and Rainfall of Landfalling Tropical Cyclones[J].Acta Meteorologica Sinica,2007,21(1):34-46. |
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| Authors: | LI Ying and CHEN Lianshou State Key Laboratory of Severe Weather Chinese Academy of Meteorological Sciences Beijing |
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| Institution: | State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081 |
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| Abstract: | Numerical studies have been carried out to investigate the sustention and intensification of Typhoon Nina (7503), and the impacts of saturated wetland on the sustention and rainfall of tropical cyclone (TC) over land through sensitivity experiments, using the PSU/NCAR non-hydrostatic mesoscale model MM5v3 and its TC bogus scheme. The results show that the vertical transfer of fluxes in the boundary layer over saturated wetland has significant influence on the intensity, structure, and rainfall of a landfalling TC. The latent heating flux and the sensible heating flux are both favourable for TC sustaining and intensification on which the latent heating transfer is more favourable than the sensible heating transfer. They are also favourable for the maintenance of the spiral structure, and have an evident effect on the distribution of TC rainfall. The momentum flux weakens the TC vortex wind fields significantly, and is the dominant factor to dissipate and fill in a low pressure system, while it increases the local precipitation induced by a typhoon. |
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| Keywords: | wetland boundary layer fluxes landfall typhoon numerical experiments |
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