Based on conventional ground data, typhoon best track from Shanghai Typhoon Institute, sounding data, black body temperature equivalent (TBB) of FY-2 meteorological satellite from National Satellite Meteorological Center, and high-resolution NCEP/NCAR global reanalysis data, the physical development mechanism and strong precipitation mechanism in Northeast China during typhoon Lionrock (1610) merging into extratropical cyclone process was analyzed. The result indicated that symmetric tropical cyclone cloud system developed into asymmetric baroclini cloudsystem, and finally evolved into mature extratropical cyclone cloud system. Meanwhile, Lionrock entered into the strong vertical wind shear environment gradually, and typhoon vortex circulation, water-vapor transfer and vertical movement showed remarkable asymmetric and vertical westward tilt feature. Furthermore, warm-core structure was destroyed, water-vapor transfer gradually went away from typhoon circulation. Under the interaction between upper and low-level jet, extratropical cyclone appeared obvious frontogenesis for the positive vertical vorticity advection, which enhanced the development of extratropical cyclone. Under the co-effect of Lionrock and extratropical cyclone, enhanced dynamic, water vapor and energy transport caused by development cyclone, was the main reason for the heavy rain in northeast China. It was found that precipitation in Northeast China mainly occurred in warm advection, high value of thickness gradient had good direct a indicative function. It was also found that heavy precipitation was influenced by strong upper levels divergence and low levels convergence of dynamic and water vapor, meanwhile corresponded to strong temperature advection and vertical upward motion. Long time duration of rainfall and ending slow, was related with weak dry cold air intrusion from high to low level slowly. The precipitation process was sustainability, with relatively strong convective precipitation occurring locally.
LIU Shuo
,
LI Deqin
,
SAI Han
,
TIAN Li
,
ZHAO Ming
. The Physical Mechanism and Strong Precipitation in Northeast China Analysis during Typhoon "Lionrock" Merging into Extratropical Cyclone Process[J]. Plateau Meteorology, 2019
, 38(4)
: 804
-816
.
DOI: 10.7522/j.issn.1000-0534.2018.00109
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