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The Diagnostic Analysis of Instability about a Heavy Rain Process in Southwest China

Author: WuZheHong
Tutor: DingZhiYing
School: Nanjing University of Information Engineering
Course: Meteorology
Keywords: Rainstorm Moist potential vorticity Conditional Symmetric Instability (CSI) Numerical Simulation
CLC: P458.121.1
Type: Master's thesis
Year: 2007
Downloads: 75
Quote: 1
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Abstract


Firstly, using ground altitude conventional data and NCEP 1 ° × 1 ° global reanalysis data on May 29, 2004 to the 30th heavy rain in Guizhou diagnostic analysis : the process in the lower southwest airflow strengthening stimulate the secondary circulation rising branch of the left side of the upper westerly jet stream southward wind speed increase as well as senior spokes finish strengthen , help produce heavy rain . MPV in the process of rainfall , the lower < 0, the high-level MPV > 0, | of MPV1 | > | MPV2 | the main pre MPV1 mainly late frontal southward the negative MPV2 area appear . Pre- symmetric instability mainly for convective instability , convective instability energy effect precipitation began , the convective instability District and CAPE energy big value began to accumulate before the start of the precipitation , precipitation increased convective instability energy dissipation , have the symmetric unstable energy development . The mesoscale MM5 (V3.6) mode to simulate the main features of the precipitation , and the use of high-resolution numerical simulation output data to explore the characteristics and mechanism of the development of the heavy rainfall occurred : The model simulated the north and south rainfall center , south of the corresponding rainfall in Guizhou Center pre prefrontal warm sector torrential rain , the precipitation of late as the frontal southward to the frontal zone . Shear line formed in the flow field simulation southwest vortex is generated in the highlands , the eastward shift of the cold front to promote and southwesterly airstream strengthen South caused by precipitation . The simulation results of the high - level flow field in the lower sub - domain simulation of the flow field is better than the parent domain . Generally speaking, the analog is successful. The warm sector torrential rain , the low-level vortex shear and high-level divergence trigger convective instability release , making in the high - level θe line steep slantwise vorticity development , so that the low-level positive vorticity increase , and further promote the low-level low the value of system development , upward motion to strengthen the precipitation increase ; At the same time , due to the release of the of θe line steep and unstable energy , high level of conditional symmetric instability development , the symmetric instability and further strengthen the upward motion . When the front moved south , symmetric instability weakened rapidly weakens precipitation .

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CLC: > Astronomy,Earth Sciences > Atmospheric science (meteorology ) > Weather Forecast > Weather analysis of the process > Profile analysis > Individual analysis > Analysis of the precipitation process > Analysis of torrential rain
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