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Characteristics of an Explosive Cyclone over Northeast China Revealed by satellite water vapor imagery

Journal of Tropical Meteorology 2022年第3期28卷 261-272页

作者： YANG Xiao-liang YAO Xiu-ping YANG Yue YANG Min CHEN Bi-ying Hebei Meteorological Observatory Shijiazhuang 050021 China Hebei Laboratory for Meteorological and Ecoenvironment Shijiazhuang 050021 China State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesBeijing 100081 China China Meteorological Administration Training Centre Beijing 100081 China Shijiazhuang Meteorological Bureau Shijiazhuang 050081 China Hebei Provincial Meteorological Administrative&Technical Service Center Shijiazhuang 050021 China

In this paper,an explosive cyclone(EC)that occurred over Northeast China in the spring of 2016 is studied by using 6.7μm FY satellite water vapor(WV)imagery and NCEP(1°×1°)reanalysis ***,the evolutions of the upper-level jet stream(ULJ),the vertical motions,and the potential vorticity(PV)are analyzed in *** show that different shapes of the WV image dark zones could reflect different stages of the *** the pre-explosion stage,a small dark zone and an S-shaped baroclinic leaf cloud can be found on the WV *** the dark zone expands and the leaf cloud grows into a comma-shaped cloud at the explosively developing *** the post-explosion stage,the dark zone brightens,and the spiral cloud *** whole process can be well described by the WV *** dynamic dry band associated with the sinking motion and the ULJ can develop into the dry intrusion later,which is an important signal in forecasting the EC and should be paid attention to when analyzing the WV ***,the mechanism is also analyzed in detail in this *** usually occurs in the left-exit region of the 200-h Pa jet and the region ahead of the 500-h Pa trough where there is significant positive vorticity advection(PVA).When the EC moves onto the sea surface,the decreased friction would favour the development of the *** upper-level PVA,the strong convergence at low level,and the divergence at high levels can maintain the strong ***,the high PV zone from the upper levels extends downward,approaching the ***,they keep the cyclone deepening continuously.

关键词： satellite water vapor imagery explosive cyclone dry intrusion physical quantity configuration

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