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Study on Typical Weather System Clouds and Preciptation with Their Multi-scale Structures in Henan

Author: SuAiFang
Tutor: ZhouZuoZuo
School: Nanjing University of Information Engineering
Course: Meteorology
Keywords: Low slot - shear cloud system Stratiform precipitation Satellite Data Macro and micro structure Precipitation Enhancement Potential
CLC: P426.6
Type: Master's thesis
Year: 2007
Downloads: 72
Quote: 0
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Henan spring and autumn precipitation processes affect the system and cloud field characteristics using conventional data analysis, Henan spring and autumn precipitation typical weather patterns. Select the satellite data, radar data, precipitation data, and NCAR / NCEP reanalysis data, the typical stratiform low slot - shear type structure of multi-scale cloud systems and their precipitation mechanism-depth study, and finally combined with case analysis such stratiform precipitation precipitation enhancement potential is discussed. The main conclusions are as follows: Henan spring and autumn precipitation altitude is low groove and the low slot - shear type, the main ground type in East cold front type and inverted Groove, such low-altitude configuration has better moisture conditions and power convergence conditions, Henan typical spring and autumn precipitation type. Satellite data analysis shows the low groove cloud system has a different structure and precipitation characteristics and shear line cloud, the low slot Cloud Department distributed temperate low light, uneven structure; shear line cloud structure is more uniform, TBB than high. Eastward shift of the trough of low cloud system with shear line northward cloud system superimposed on the region and its nearby superimposed mesoscale cloud clusters, these are formed between the upper trough before and 700hPa and 850hPa shear line β-scale cloud 700hPa shear line the south side of strong precipitation a good correlation between the brightness temperature of the sample area average precipitation and showed similar trends; 700hPa shear on the north side of brightness temperature values ??with rain strong correspondence relationship uncertain. Macro-structural analysis of precipitation clouds Henan in the precipitation process is mainly affected by the more uniform precipitation echoes affect small and medium-scale cloud area strength a 35 ~ 40dBZ flocculent echo development, spread eastward, columnar precipitation radar RHI echo development, and other parts of the cloud with weak precipitation echoes. TRMM (PR) 700hPa shear line the south side of the precipitation cloud with embedded the strong rainfall values ??center stratiform clouds with the overall relatively uniform background under certain spatial extent of the ups and downs together. Similarly, satellite retrieval of cloud-top height cloud system in the development and evolution of cloud top height some ups and downs, is not very uniform. 700hPa shear line the south side has a better power convergence conditions and moisture conditions conducive to the formation of natural precipitation, its north side with convective instability conditions, but the poor conditions of low-altitude water vapor, the power of convergence and uplift conditions are relatively weak natural precipitation is low. The precipitation cloud microphysical structure analysis showed that the cloud system development at different stages and in different parts of the cloud system, microphysical structure difference. Cloud, snow, sleet, supercooled cloud water formation and enhanced precipitation has an important role. Henan eastward shift of the low slot Cloud and North lift cut variable cloud system precipitation enhancement potential, and 18-24 hours in advance to determine. The potential conditions 700hPa shear line the south side is better than the north side. Discussion the precipitation cloud microscopic precipitation enhancement potential seen south of 700hPa shear line in line the catalytic - supply \the various hydrometeors water content increased precipitation enhancement potential is qualified This analysis is consistent with the macroeconomic potential.

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CLC: > Astronomy,Earth Sciences > Atmospheric science (meteorology ) > Meteorological elements,atmospheric phenomenon > Water vapor,condensation,and precipitation > Precipitation
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