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Numerical Simulation and Diagnostic Analysis of the Landfall Typhoon Rainstorm

Author: LinWeiHua
Tutor: ShenTongLi
School: Nanjing University of Information Engineering
Course: Meteorology
Keywords: Typhoons and storms MM5 model Numerical experiments Research
CLC: P458.121.1
Type: Master's thesis
Year: 2007
Downloads: 145
Quote: 0
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Abstract


MM5 model simulated typhoons and storms landed in Fujian in 2005 , and achieved good results . The simulated typhoon rainfall center strength and the location and distribution of precipitation with live basically. Precipitation in the coastal areas of Fujian main physical mechanisms : (1) the typhoon landed in Fujian before and after stratification over the coastal areas of Fujian quite unstable ; (2) due to the typhoon circulation asymmetry in the north of the center of the typhoon on the middle and lower than strong rapids and relative humidity , positive vorticity , convergence , vertical velocity of the center ; ( 3 ) sets the asymmetric structure of the flow field of the vorticity , divergence , vertical velocity and potential vorticity distribution is asymmetric and Fujian coastal topography features, the direct impact of the rain with the distribution of non- symmetry . Different terrain height to simulate the period of typhoon precipitation process , the test results show a significant increase in the role of the the special Fujian eastern coastal terrain on the typhoon landed in Fujian in central coastal rainfall . (a) terrain can increase the typhoon center and near the precipitation . The typhoon landed in Fujian in central coastal Fujian eastern coast of the two mountains Taimushan , Daiyunshan Mountains on the local typhoon storm has a significant role in the increase . (b) higher terrain and terrain can make more uneven rainfall distribution . (c) In addition to the west side of the typhoon , especially the increase in precipitation in the sea and the center of the typhoon and its nearby precipitation changes was the relationship between anti-phase change . ( d ) typhoon precipitation influenced by terrain showing a distribution of positive and negative changes in the white column - class gravity waves . Finally , different convective parameterization schemes affect the of typhoon precipitation process before and after the typhoon landed , typhoons and storms process simulation tests showed that the different parameters of the program there are differences . Increase the role of topographic uplift caused by convective precipitation not exist without the introduction of cumulus convective parameterization scheme , lead to the simulated precipitation significantly reduced and the positional deviation . Different resolutions, the effect of simulated precipitation differences , the thickness grid precipitation simulation results are very similar , but more accurate fine grid simulation of precipitation distribution , a more detailed description of typhoons and storms process fine grid simulation of rainfall distribution has more detailed meso-β scale the rain group information .

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CLC: > Astronomy,Earth Sciences > Atmospheric science (meteorology ) > Weather Forecast > Weather analysis of the process > Profile analysis > Individual analysis > Analysis of the precipitation process > Analysis of torrential rain
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