On the Mechanism of a Terrain-Influenced Snow Burst Event during Midwinter in Northeast China

作     者：Na LI Baofeng JIAO Lingkun RAN Xinyong SHEN Yanbin QI Na LI;Baofeng JIAO;Lingkun RAN;Xinyong SHEN;Yanbin QI

作者机构：Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Key Laboratory of Meteorological DisasterMinistry of Education/Joint International Research Laboratory of Climate and Environment Change/Collaborative Innovation Center on Forecast and Evaluation of Meteorological DisastersNanjing University of Information Science and TechnologyNanjing 210044China Jilin Weather Modification OfficeChangchun 130062China 

出 版 物：《Advances in Atmospheric Sciences》 (大气科学进展（英文版）)

年 卷 期：2021年第38卷第5期

页      面：800-816页

核心收录：

学科分类：07[理学] 070601[理学-气象学] 0706[理学-大气科学] 

基　　金：the Chinese Academy of Sciences(Grant No.XDA17010105) the National Key Research and Development Project(Grant No.2018YFC1507104) The Key Scientific and Technology Research and Development Program of Jilin Province(Grant No.20180201035SF) the National Natural Science Foundation of China(Grant Nos.41875056,41575065 and 41790471,42075013) Chongqing Technology Innovation and Application Development Special Key Project(Grant No.cstc2019jscxtjsbX0007) 

主　　题：terrain-influenced snow burst snowband instability lifting 

摘      要：Short-duration snow bursts with heavy snow represent one type of hazardous weather in winter which can be easily missed by the winter weather warnings but often results in great *** this paper,the mechanism for the occurrence of such events was investigated with the aid of a localized terrain-influenced snow burst event in Northeast *** snow burst was produced by an eastward-moving cold-frontal snowband which encountered the downstream complex terrain of the Changbai Mountains and *** ascertain the role of orography on the snow burst,numerical experiments,together with a parallel sensitivity experiment removing Changbai Mountains,were performed to attempt to distinguish the contributions of cold-frontal system and orographic effects to produce the heavy *** showed that without the influence of Changbai Mountains,the release of conditional instability(CI)and inertial instability(II)within a weak frontogenetical environment was responsible for the snowband *** effects played important roles in enhancing the snowband and increasing the snowfall *** enhancement mechanism was related to the interactions of the cold-frontal snowband and the *** the one hand,orographic frontogenesis and persistent ascent,created by orographic gravity waves over the terrain,greatly enhanced the orographic *** intensification of the lifting promoted the release of CI and thus enhanced the *** the other hand,pre-existing orographic instabilities were released due to the passing of the cold-frontal snowband,which could also serve to intensify the snowband over terrain and thus increase the snowfall.