| 湿地边界层通量影响热带气旋登陆维持和降水的数值试验 |
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| 引用本文： | 李英,陈联寿.湿地边界层通量影响热带气旋登陆维持和降水的数值试验[J].气象学报,2005,63(5):683-693. |
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| 作者姓名： | 李英 陈联寿 |
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| 作者单位： | 中国气象科学研究院灾害天气国家重点实验室,北京,100081 |
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| 基金项目： | 科技部国家重点基础研究发展规划项目(2004CB4181301)，国家自然科学基金项目(40575018) |
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| 摘 要： | 用MM5v3模式及其TC Bogus方案对台风Nina(7503)在中国大陆上的维持加强过程进行模拟,并通过各种敏感性试验,研究了饱和湿地对热带气旋在大陆上维持和降水的影响。结果表明:湿地边界层内各通量对登陆热带气旋的强度、结构及其降水具有明显影响。潜热通量和感热通量均有利于热带气旋的维持和加强,其中潜热输送的作用显著,感热输送的作用较小。潜热和感热通量有利于热带气旋雨带螺旋结构的维持,对台风降水分布有明显影响,动量通量对热带气旋风场有显著的削弱作用,是其能量耗散、低压填塞的主要原因,但对台风降水具有局地增幅作用。
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| 关 键 词： | 湿地 边界层通量 登陆台风 数值试验。 |
| 收稿时间： | 5/6/2005 12:00:00 AM |
| 修稿时间： | 2005年5月6日 |
NUMERICAL STUDY ON IMPACTS OF BOUNDARY LAYER FLUXES OVER WETLAND ON SUSTENTION AND RAINFALL OF LANDFALLING TROPICAL CYCLONE |
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| Li Ying and Chen Lianshou.NUMERICAL STUDY ON IMPACTS OF BOUNDARY LAYER FLUXES OVER WETLAND ON SUSTENTION AND RAINFALL OF LANDFALLING TROPICAL CYCLONE[J].Acta Meteorologica Sinica,2005,63(5):683-693. |
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| Authors: | Li Ying and Chen Lianshou |
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| Institution: | State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081;State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081 |
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| Abstract: | Typhoon Nina(1975) moved into inland and then stagnated and sustained for 4-5 days after it made landfall in Fujian province of China on Aug.4,1975.Nina re-strengthened over inland resulting in severe flooding with the extreme rainfall of 1062 mm in 24 hours.Previous analysis indicated that the landfalling TC could sustain a longer time if it stagnated over a huge surface of a lake,reservoir or saturated wet land.Severe rainfall disaster may be arised from a certain TC remnant sunstained over land.The impacts of land-air fluxes in saturated wet land boundary layer on TC sustention have been discussed.The PSU/NCAR non-hydrostatic mesoscale model MM5v3 and its TC Bogus scheme were employed to perform several sets of numerical simulation.Bi-directional feed-back double nested grid mesh was used and Grell and Kain-Fritsch convective parameterization schemes were adopted for coarse and fine mesh respectively.Reiser's scheme and the Blackadar PBL parameterization were employed in those experiments.The results have shown that the vertical transfer of the physical quantities of the boundary layer over saturated wet land would affect the structure,intensity and rainfall of a landfalling typhoon to a great degree.Fluxes of latent and sensible heatings are favorable to tropical cyclone sustention and intensification,but the latent heat flux would play a major role in tropical cyclone intensification and sustention of spiral rain-band.They also affect the rainfall distribution.On the other hand,momentum flux would weaken TC circulation obviously and consume TC energy remarkably,but it somewhat increases the TC rainfall in local area. |
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| Keywords: | Wet land Boundary layer fluxes Landfalling TC Numerical experiments |
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