Characteristic of Precursor Environment of Mesoscale Convective System during Summer in Central-Eastern China

ZENG Bo; CHEN Yun; LI Zechun

doi:10.7522/j.issn.1000-0534.2015.00003

Plateau Meteorology >

2016 , Vol. 35 >Issue 2: 460 - 468

DOI: https://doi.org/10.7522/j.issn.1000-0534.2015.00003

Characteristic of Precursor Environment of Mesoscale Convective System during Summer in Central-Eastern China

ZENG Bo ,
CHEN Yun ,
LI Zechun

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Institute of Plateau Meteorological, China Meteorological Administration/Heavy Rain and Drought-Flood Disasters in Plateau and Basin Key Laboratory of Sichuan Province, Chengdu 610072, China;2. Chengdu University of Information Technology, Chengdu 610225, China;3. National Meteorological Center, Beijing 100081, China

Received date: 2014-04-09

Online published: 2016-04-28

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Abstract

NCEP reanalysis data were used to examine the environment fields prior to mesoscale convective system (MCS) development and null MCS during summer (June-August) of 2008-2010 in central-eastern China. The significant differences were found between environments that support development of MCSs and those that do not support convective organization of MCSs. About 6 hours prior to development for MCS, strong southwest wind controls the middle and low troposphere, and the West Pacific subtropical high strengthens westward. Meanwhile, the South Asia high extends eastward and upper-level jet exists in north. Over the location of MCS generation, positive vorticity and convergence exist in low level, and negative vorticity and divergence exist in upper level, causing ascending motion almost through the whole troposphere. Around the location of MCS generation, there are an obvious warm advection transported from eastern ocean and a southwest-northeast vapor transportation belt whose water vapor is mainly originated from the Bay of Bengal and South China Sea in middle and low troposphere. Meanwhile, intensive unstable at low layer, thick neutral stratification in middle troposphere and stability in upper troposphere exist.

Key words： Central-eastern Chin; Summer; MCS; Environment

Cite this article

ZENG Bo , CHEN Yun , LI Zechun . Characteristic of Precursor Environment of Mesoscale Convective System during Summer in Central-Eastern China[J]. Plateau Meteorology, 2016 , 35(2) : 460 -468 . DOI: 10.7522/j.issn.1000-0534.2015.00003

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