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The Numerical Simulation and Diagnostic Analysis of the Influence of Mesoscale Terrain on Severe Convective Weather of Henan Province

Author: XiShiPing
Tutor: ShouShaoWen
School: Nanjing University of Information Engineering
Course: Meteorology
Keywords: Strong convective Numerical Simulation Atmospheric row entropy index Wet entropy differential advection Hook echo
CLC: P445
Type: Master's thesis
Year: 2007
Downloads: 113
Quote: 0
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Abstract


Henan is located in the middle and lower reaches of the Yellow River, in the Qinling area bordered to the Huang-Huai Plain, located in subtropical to warm temperate transition region, the territory of the terrain generally includes four major types of plains, mountains, hills and basins. Because of the role of the provincial terrain factors, the strong convective weather in the western mountains and the eastern plains distribution has obvious seasonal and regional characteristics. Henan Province, multiple zones of strong convective weather, every summer, across the province will be different degrees of thunderstorms and strong winds, hail, short-time heavy rainfall and other weather disasters, to cause a lot of loss of life and property of the local people. This paper first analyzes the characteristics of Henan Province, the geographical distribution of severe convective weather climate, typing on background of strong convective weather. Mesoscale numerical model MM5 Valley on June 19, 2006 under the clear sky atmospheric wind simulation, and on July 19, 2002, Henan Province, a wide range of strong convective weather simulation under different resolution terrain The results showed that: different terrain dynamic and thermal effects caused by local circulation in the local circulation of this change in the Taihang Mountain the foothill and Xiong'ershan east side will be obvious role in the occurrence of severe convective development process the presence of complex terrain under local circulation and will certainly affect the distribution of severe convective weather in the province. July 19, 2002, strong convective weather, weather background and the meticulous physical factors as well as the physical quantity of diagnostic analysis, the results showed that: the lower atmosphere under the influence of the high-altitude cold eddy wet and dry hollow of unstable stratification by savings of energy release; the atmospheric removal entropy index analysis shows that the role of atmospheric negative entropy flow to make our province the atmosphere over the increase in the degree of order, is conducive to the instability enhancement and development of strong convection; the most favorable wet entropy of the high and low altitude differential advection analysis the that senior θ_s advection is less than the lower θ_s advection province over the gas is increasingly unstable, atmospheric convective instability enhancements; vertical wind shear that high-altitude jet stream high in rapid decline, its kinetic energy conversion of the lower perturbation to strengthen and help to stimulate the generation of unstable weather; 300 hPa at 850hPa differential bit warm advection that the day 300hPa high-level cold advection and the 850hPa low-level warm advection difference, heating and air forces are strong, so the temperature field configuration conducive to the increase of instability, strong convection process. Zhengzhou City 714CD radar echo: strong convective echoes across the Taihang, the Echo further development due to the uplift of the terrain, to strengthen the \appeared through a thunderstorm winds and hail local weather.

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CLC: > Astronomy,Earth Sciences > Atmospheric science (meteorology ) > Synoptic > Small and medium scale weather phenomena
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