Using the Tianjin doppler radar data and the meso-scale numerical simulation method, the occurrence, developing and evolution characteristics of the thunderstorms triggered by the sea breeze front on 13 August 2007 was analysed. The results show that: The simulation not only reproduced the formation and dispersion times, morphological characteristics and locations of sea breeze front reasonably well, but also presented the physical characteristics of sea breeze front more clearly. Sea breeze front was the cross belt which converged northeaster and southeaster. Temperature decreasing and moisture increasing occurred under 850 hPa on the way of sea breeze front moving toward inland. Thermal inner boundary layer also formed behind the sea breeze front and its thickness increased as close to the sea breeze front. From the horizontal distributions of temperature and water vapor, the fore-end of the sea breeze front was the area with dense temperature and humidity gradients, while the behind was cold and moist air mass. In addition, the simulation reproduced the relatively cold and dry air and the sinking divergence motion at low level behind the gust front although the narrow radar echo line associated with gust front was not able to be simulated. Thunderstorms were more likely to form at the crossing point of the collision between gust front and sea breeze front, where convergence and upward motion were more favorable to maintain and rich CAPE and dynamic instability were provided.
WANG Yan
,
GAO Shouting
,
LIANG Zhaoming
. Analysis on the Observation and Simulation of Thunderstorms Triggered by Sea Breeze Front in Bohai Bay[J]. Plateau Meteorology, 2014
, 33(3)
: 848
-854
.
DOI: 10.7522/j.issn.1000-0534.2013.00030
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