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Chongqing lightning activity patterns and analysis of surface conditions

Author: LiZheng
Tutor: XiaoWenAn
School: Nanjing University of Information Engineering
Course: Of lightning scientific and technical
Keywords: Lightning activity patterns LLS LIS Underlying surface
CLC: P427.32
Type: Master's thesis
Year: 2011
Downloads: 95
Quote: 1
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Abstract


As the United Nations recognized the lightning of the ten worst natural disasters can not only directly cause human and animal casualties , but also for aviation, electric power, petrochemical, computer networks and buildings and other hazards are obvious. Master lightning activity lightning protection laws provide for the appropriate reference , while the lightning activity , you can make accurate forecasts while avoiding disadvantages , to minimize disasters caused by lightning . Lightning activity in the analysis of the previous law , generally are used in a single lightning information and, if using ground lightning location data , space-based satellite positioning data or artificial thunderstorm observed data . These types of data in the analysis of regional advantages and disadvantages when lightning activity patterns . Ground lightning location data is recorded to flash the main information on the large-scale lightning activity indicates poor ; space-based satellite positioning data by satellite over the top time of impact on a regional lightning activity records were incomplete ; while thunderstorms manual observation daily data only for the year the number of days of thunderstorms that occur make a record of thunderstorm activity patterns indicative of specific difference . To address this situation , this paper 1998-2005 TRMM satellite carries Lightning Imaging Sensor (Lightning Imaging Sensor-LIS) observed lightning data , power systems LLS lightning location information and Chongqing area information on artificial thunderstorm lightning activity patterns in Chongqing a statistical analysis , from the time and space analysis of lightning activity patterns . And analysis of large-scale weather circulation , surface conditions , topography and other factors on the characteristics of Chongqing shaped lightning effects , the results showed that: ( 1 ) the distribution of Chongqing lightning significant seasonal variation , mainly concentrated in the summer months Lightning 4-9 months, including July lightning up , Chongqing lightning occurs mainly at night , night flash ratio reached 60% ; ( 2 ) Chongqing lightning distribution affected by topography significantly , lightning mainly concentrated in the mountains , valleys nearby ; ( 3 ) above sea level height change on lightning characteristics to a certain extent , the proportion of high-altitude am flash , flash amplitude is substantially significantly increased the value of lightning ; ( 4 ) distribution of surface conditions on the Lightning have a certain impact , lightning occurs mostly in farmland , water , and pastures.

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CLC: > Astronomy,Earth Sciences > Atmospheric science (meteorology ) > Meteorological elements,atmospheric phenomenon > Atmospheric phenomena > Atmospheric electricity phenomena ( atmospheric electricity ) > Unstable weather of the electric
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