By using the NCEP 1°×1° reanalysis daily datasets, the dynamic and thermal three-dimensional structure and evolution characteristics of a central Asian vortex causing rainstorm during 4 to 7 September 2009 were analyzed, and its development mechanisms were discussed. The results indicated that the vortex had an obvious cold core structure and developed strongly, which developed at the upper firstly (its center and evolution characteristics were evident on 300 hPa) and extended downward with time, its development-mature-weakened process was a baroclinic-barotropic-baroclinic process. In mature stage, cold center coincided with height center with the axis tending to be vertical; there was a positive vorticity center on both western and eastern flank of vortex center on 300 hPa which were symmetrical and the vorticity almost was positive in troposphere; the lower troposphere was convergence while the upper troposphere was divergence, making conditions favorable for ascending motion and vortex development. In weaken period, the axis-line tilted toward the west and cold center declined significantly; there was negative vorticity in the middle and upper troposphere and no obviously divergence/convergence and ascending motion in almost all of troposphere over vortex center. During this process, ascend motion combined with ample water vapor condition causing the heavy precipitation. The “upper dry, lower wet” spatial structure in troposphere, the cold air moved downward as well as the intrusion and downward motion of high potential vorticity were conducive to the development of this vortex and played a significant role in its development and evolution.
LI Man
,
YANG Lianmei
,
ZHANG Yunhui
. Dynamic and Thermal Structure and Evolution Characteristics of a Central Asian Vortex[J]. Plateau Meteorology, 2015
, 34(6)
: 1711
-1720
.
DOI: 10.7522/j.issn.1000-0534.2014.00077
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