Idealized Numerical Simulations of Tropical Cyclone Formation Associated with Monsoon Gyres  

作　　者：LIANG Jia WU Liguang ZONG Huijun 

机构地区：[1]Key Laboratory of Meteorological Disasters of the Ministry of Education,Nanjing University of Information Science and Technology [2]State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences

出　　处：《Advances in Atmospheric Sciences》2014年第2期305-315,共11页大气科学进展（英文版）

基　　金：supported by the typhoon research project (Grant No. 2009CB421503) of the National Basic Research Program of China;the National Natural Science Foundation of China (Grant No. 41275093);the social commonwealth research program of the Ministry of Science;Technology of the People’s Republic of China (Grant No. GYHY200806009);the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)

摘　　要：Monsoon gyres have been identified as one of the important large-scale circulation patterns associated with tropical cyclone （TC） formation in the western North Pacific.A recent observational analysis indicated that most TCs form near the center of monsoon gyres or at the northeast end of the enhanced low-level southwesterly flows on the southeast-east periphery of monsoon gyres.In the present reported study,idealized numerical experiments were conducted to examine the tropical cyclogenesis associated with Rossby wave energy dispersion with an initial idealized monsoon gyre.The numerical simulations showed that the development of the low-level enhanced southwesterly flows on the southeasteast periphery of monsoon gyres can be induced by Rossby wave energy dispersion.Mesoscale convective systems emerged from the northeast end of the enhanced southwesterly flows with mid-level maximum relative vorticity.The simulated TC formed in the northeast of the monsoon gyre and moved westward towards the center of the monsoon gyre.The numerical experiment with a relatively smaller sized initial monsoon gyre showed the TC forming near the center of the initial monsoon gyre.The results of the present study suggest that Rossby wave energy dispersion can play an important role in TC formation in the presence of monsoon gyres.Monsoon gyres have been identified as one of the important large-scale circulation patterns associated with tropical cyclone （TC） formation in the western North Pacific.A recent observational analysis indicated that most TCs form near the center of monsoon gyres or at the northeast end of the enhanced low-level southwesterly flows on the southeast-east periphery of monsoon gyres.In the present reported study,idealized numerical experiments were conducted to examine the tropical cyclogenesis associated with Rossby wave energy dispersion with an initial idealized monsoon gyre.The numerical simulations showed that the development of the low-level enhanced southwesterly flows on the southeasteast periphery of monsoon gyres can be induced by Rossby wave energy dispersion.Mesoscale convective systems emerged from the northeast end of the enhanced southwesterly flows with mid-level maximum relative vorticity.The simulated TC formed in the northeast of the monsoon gyre and moved westward towards the center of the monsoon gyre.The numerical experiment with a relatively smaller sized initial monsoon gyre showed the TC forming near the center of the initial monsoon gyre.The results of the present study suggest that Rossby wave energy dispersion can play an important role in TC formation in the presence of monsoon gyres.

关 键 词：monsoon gyre tropical cyclone formation idealized numerical simulation 

分 类 号：P425.42[天文地球—大气科学及气象学] P444