Radar-based Characteristics and Formation Environment of Supercells in the Landfalling Typhoon Mujigae in 2015  

作　　者：Lanqiang BAI Zhiyong MENG Ruilin ZHOU Guixing CHEN Naigeng WU Wai-Kin WONG 

机构地区：[1]School of Atmospheric Sciences,Sun Yat-sen University,and Key Laboratory of Tropical Atmosphere-Ocean System,Ministry of Education,and Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519082,China [2]Department of Atmospheric and Oceanic Sciences,School of Physics,Peking University,Beijing 100871,China [3]Institute of Tropical and Marine Meteorology,China Meteorological Administration,Guangzhou 510640,China [4]Hong Kong Observatory,Hong Kong 999077,China

出　　处：《Advances in Atmospheric Sciences》2022年第5期802-818,共17页大气科学进展（英文版）

基　　金：funded fun-ded by the National Natural Science Foundation of China(Grant Nos.41875051 and 41905043);the China Postdoctoral Sci-ence Foundation(Grant No.2019M653146)。

摘　　要：This study presents the radar-based characteristics and formation environment of supercells spawned by the tornadic landfalling Typhoon Mujigae(2015)in October 2015.More than 100 supercells were identified within a 24-hour period around the time of the typhoon’s landfall,of which three were tornadic with a rotational intensity clearly stronger than those of non-tornadic supercells.The identified supercells were concentrated within a relatively small area in the northeast quadrant beyond 140 km from the typhoon center.These supercells were found more likely to form over flat topography and were difficult to maintain in mountainous regions.During the study period,more supercells formed offshore than onshore.The mesocyclones of the identified supercells were characterized by a small diameter generally less than 5 km and a shallow depth generally less than 4 km above ground level.An environmental analysis revealed that the northeast quadrant had the most favorable conditions for the genesis of supercell in this typhoon case.The nondimensional supercell composite parameter(SCP)and entraining-SCP(E-SCP)were effective in separating supercell from non-supercell environment.Even though the atmosphere in the typhoon’s northeast quadrant was characterized by an E-SCP/SCP value supportive of supercell organization,orography was an impeditive factor for the supercell development.These findings support the use of traditional parameters obtained from midlatitude supercells to assess the supercell potential in a tropical cyclone envelope.

关 键 词：SUPERCELL tropical cyclone atmospheric environment radar meteorology 

分 类 号：P444[天文地球—大气科学及气象学] P412.25