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Numerical Simulation and Diagnostic Analysis of Heavy Rainfall Caused by No.0509 Typhoon "Matsa"

Author: LiuHanHua
Tutor: ZhouJunï¼›ShouShaoWen
School: Nanjing University of Information Engineering
Course: Meteorology
Keywords: Typhoons and storms Numerical Simulation Improved ageostrophic wet Q vector Diagnostic analysis
CLC: P457.8
Type: Master's thesis
Year: 2006
Downloads: 254
Quote: 3
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Abstract


Firstly, using the NCEP objective analysis of data , the 0509 typhoon Matsa activities process analysis, the subtropical high is a direct impact on the system of the typhoon moving path . The use of FY-2 visible cloud picture the typhoon 's development process revealed a favorable environment for the typhoon strength weakened slowly reason , typhoons and storms . Doppler radar data to analyze the typhoon precipitation , NCEP objective analysis data , ground , high-altitude routine observations of the typhoon rainstorm weather diagnostic analysis , pointed out that the heavy rainfall coupling configuration of the Low Level Jets important reason , through the analysis of a variety of physical quantities in the process , rainstorm process system . Major changes in physical field in heavy rain on the instructions of precipitation area . Mesoscale numerical model (MM5V3.7) Numerical Simulation of Typhoon Rainstorm in the ideal simulation based on the use of the high spatial and temporal resolution of the numerical simulation output data to explore the characteristics and mechanism of the development of the heavy rain . Asymmetric structure of the flow field of the station , a direct impact on the asymmetry of the distribution of rain bands . Ageostrophic wet Q vector , the introduction of improved diagnosis : the vector can be used to diagnose the heavy precipitation process . 500hPa layer improved ageostrophic wet Q vector divergence distribution and the time evolution of typhoons and storms of heavy precipitation and its time evolution has good correspondence between the intensity of precipitation intensity change with time instructions . Vertical helicity diagnosis : 650hPa vertical helicity horizontal distribution of precipitation distribution good correspondence between the the Chia Tai value corresponding to the center of heavy rainfall center . Moist potential vorticity diagnosis : heavy precipitation occurs , the lower atmosphere is both symmetric instability , also in the convective instability . The relatively moist potential vorticity Evolution have a good indication of the role of the evolution of precipitation .

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CLC: > Astronomy,Earth Sciences > Atmospheric science (meteorology ) > Weather Forecast > Main meteorological elements of weather phenomena and forecasting > Tropical cyclones, typhoons, hurricanes forecast
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