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Study on the Statistic Feature of the Low Level South-Westerly Strong Wind and the South-westerly LLJ in China and Analysis of the Role of the Inertial Stability

Author: ZhangWenLong
Tutor: ZhouJun
School: Nanjing Institute of Meteorology
Course: Meteorology
Keywords: Low-rise high winds LLJ Statistical characteristics Inertial Stability Symmetric stability
CLC: P425
Type: Master's thesis
Year: 2003
Downloads: 144
Quote: 0
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Abstract

Southwest of low-rise high winds phenomenon can be basically divided into two categories, a class of independent low-rise high winds nuclear structure, and those that do not have the independent the windy nuclear structure. China LLJ statistical analysis, these two types of low-level strong winds are generally considered low-level jet. This article learn from the way of thinking of the North American study LLJ climatic characteristics, combined with the weather characteristics, single station on the southwest of China's low-rise high winds, the southwest wind LLJ seedless southwest of low-rise high winds phenomenon is defined on this basis using the sounding reported data from 98 January -02 December 5, the statistics on the the 89 radiosonde station southwest of low-rise high winds the number of activities made analysis results show that: the lower two southwest gale Activity Center monthly variation of Jiangnan and northeast regions, both activities are located and the diurnal variation of certain differences; June to August, the the southwest Lower gale activities concomitant regional rainstorm and the Yangtze River basin, near the middle and lower reaches of the Yangtze River and two lakes basin The southwest of low-rise high winds activities obvious diurnal variation. Then, the southwest wind LLJ - independent gale nuclear southwest of low-rise high winds, made a comparative analysis with the activities of non-nuclear southwest of the lower windy times, results show that: the activities of the two seasons, the spatial distribution of the diurnal variation of different corresponding pressure field in the vertical cross-sectional view of the situation, and wind speed are also significantly different, there are some differences in the the Jiangnan LLJ northeast LLJ. In addition, the role of inertial stability not taken seriously in the past, this article through the southwest low rapids left front and high-altitude northerly gale right axis inertial stability and symmetry of the rear stability theory analysis and examples show that the inertial stability in associated Low Level Jets rainstorm important, revealing a rainy rainstorm, a new level of jet coupling mechanism: LLJ left front inertial stability to the presence of large value area is conducive to the accumulation of low-level moist heat energy, low-level tilt convection instability in the development of more expectations conditional symmetric instability or convective instability; altitude northerly gale-axis (the presence of the westerly jet), the right rear (right) symmetric instability favorable conditions, altitude is relatively easy dry symmetric instability; inertial stability, so that the lower inclined convection more inclined in the vertical direction, is conducive to the development of convection, the senior tilt convection is more inclined to the horizontal direction, and is conducive to high-level divergence.

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