Abstract：
Abstract：Based on conventional meteorological data, intensive AWS data, NCEP 1°×1 ° reanalysis data, satellite brightness temperature
data, Doppler radar data, VDRAS data and wind profiler data, two torrential rain events in July 2012 were analyzed. The results showed that:
(1) as to the causes of the precipitation, the“7·21”event belonged to a“frontal precipitation”, which had more favorable dynamic conditions,
while the“7·25”event belonged to a“warm area precipitation”, which had statically more unstable conditions. (2) The southeast airflow at
the top of typhoon“Vicent”, and the southerly airflow at the edge of subtropical high constitute water vapor channels for the two heavy rain
events in North China, although their convergence areas were different. (3) After cold air intrusion, the convective system of the“7·21”event
was more well-organized, while the“7·25”event was triggered by the convergence in southerly flow. The maintaining mechanism of the two
torrential rain events were both related to the convergence of thunderstorm outflow and the southerly flow. The MCS in the ”7·21”event
moved from northwest to southeast, as the trough line moving to the east, but the MCS in the“7·25”events moved from southwest to northeast,
which was forced by southwesterly flow.
.2014. Multi-scale comparative analysis of two torrential rain events in Tianjin on the edge of the Subtropical
High[J].
Torrential Rain and Disasters, 33(4): 372-379.
