By using conventional observation data, radar reflectivity, 1°×1° NCEP reanalysis data and unconventional observations including wind profile radar and ground-based radiometer data, the cold air and its influence was studied according to a strong convective storm in Beijing area on 23 June 2011. The main results are as follows: The dry zone and high potential area above middle-level corresponded well with dark zone in WV image, which showed the dry intrusion was obvious. The temperature, humidity and wind changed instinctly which was observed by the ground-based radiometer and profile radar, the storm was triggered just after the temperature and humidity above 5 km decreased to the lowest. The dry intrusion caused the low θse center just over the high θse center, which led to strong convective instability. The lower level northeast airflow was cold and dry, and the corresponding temperature front was distinct under 850 hPa, which provided dynamical and thermal effect for the development of the convective system. The backflow cold formed anticyclone on the east of Beijing, which was good for the convective system to stay at Beijing and the rainfall to sustain longer.
WU Qingmei
,
ZHANG Shengjun
,
LIU Zhuo
,
ZHAO Wei
. Activities of Cold-Dry Air and Its Impact on Convective Heavy Rain Process in Beijing[J]. Plateau Meteorology, 2015
, 34(6)
: 1690
-1698
.
DOI: 10.7522/j.issn.1000-0534.2014.00081
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