By using conventional meteorological observation data, TBB data, NCEP reanalysis data, a brief rainstorm happened on 14 June, 2011 in northern Jiangxi was analyzed. The results showed that: (1) Torrential rain happens with the interaction of South Asia High, subtropical high, west trough, monsoon, frontal cyclone and its meso-scale system. The stronger divergence in front of west trough on higher-levels is different from typical MeiYu. (2) Some general structural characteristics of Meiyu fronts are confirmed, such as the strong contrast of θse, the positive velocity, the wind and moisture convergence over the lower troposphere within the Meiyu front zone, etc. Especially, it is revealed that Meiyu front is highly baroclinic during the period. Besides, there are strong contrast of temper and wind shear within the front zone. (3) There exists convective instability in typical Meiyu, while symmetry instability in the event because of interactions between boundary convergence, baroclinic front zone and tropospheric jet, which make brief rain maintains.(4) More effective dynamic conditions, more stronger frontal zone and its frontogenesis process are close to the occurring of rainstorm than typical Meiyu. The strong ascending motion, strong divergence in higher-levels, strong convergence in lower-levels coupled with the development of meso-scale system, positive vorticity develops upward along the frontal zone of θse, which contributes much to the maintenance of heavy rain. (5) There is favorable vapour transfering mechanism by strong high-low level jets. The short distance between high-low level jets is effect to the coupling of high-low level jets.
ZHENG Jing
,
SUN Suqin
,
XU Aihua
,
WU Jing
. Mechanism of Formation and Maintenance for a Torrential Rain on Strong Meiyu Front[J]. Plateau Meteorology, 2015
, 34(4)
: 1084
-1094
.
DOI: 10.7522/j.issn.1000-0534.2014.00019
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