一次东北冷涡背景下MCS过程多尺度能量相互作用研究  

Multi-scale energy interaction study in the MCS process under a Northeast Cold Vortex

作　　者：沈新勇[1,2] 张弛 肖云清 沙莎 王林 李小凡[6] SHEN Xinyong;ZHANG Chi;XIAO Yunqing;SHA Sha;WANG Lin;LI Xiaofan(Key Laboratory of Meteorological Disaster,Ministry of Education/Joint International Research Laboratory of Climate and Environment Change/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science and Technology,Nanjing 210044,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519082,China;Key Laboratory for Meteorological Disaster Monitoring and Early Warning and Risk Management of Characteristic Agriculture in Arid Regions,CMA,Yinchuan 750002,China;Yinchuan Meteorological Bureau,Yinchuan 750002,China;Shanghai Marine Meteorological Center,Shanghai 201306,China;School of Earth Sciences,Zhejiang University,Hangzhou,Zhejiang 310027,China)

机构地区：[1]南京信息工程大学气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心,江苏南京210044 [2]南方海洋科学与工程广东省实验室(珠海),广东珠海519082 [3]中国气象局旱区特色农业气象灾害监测预警与风险管理重点实验室,甘肃银川750002 [4]银川市气象局,甘肃银川750011 [5]上海海洋中心气象台,上海201306 [6]浙江大学地球科学学院,浙江杭州310027

出　　处：《大气科学学报》2020年第3期447-457,共11页Transactions of Atmospheric Sciences

基　　金：国家重点研发计划(2019YFC1510400);国家自然科学基金资助项目(41530427;41790471;41975054;41930967;41775040);中国科学院战略性先导科技专项(XDA20100304);中国气象局预报员专项(CMAYBY2019-132)。

摘　　要：采用WRF模式对东北冷涡背景下MCS过程进行模拟,利用Barnes滤波将模式数据分解为3个尺度,分别代入相应的能量方程中进行计算,从能量角度研究MCS发展过程,多尺度系统能量相互转化,以及动能与降水的联系。研究表明:在此次过程中各尺度之间都有位能向动能的大量转化,为系统发展提供能量。在对流单体发展到MCS成形前,中低层天气尺度动能减少,天气尺度动能向β中小尺度动能转换,促进对流单体的发展;高层天气尺度动能增强,对应高空急流增强,促进对流系统发展;β中小尺度系统在中层对α中尺度系统有动能输送,促进MCS形成。在MCS形成和发展阶段,各尺度位能向α中尺度和β中小尺度动能转化达到最大。在MCS减弱阶段,天气尺度系统和α中尺度系统在中高层对β中小尺度系统有一定的抑制作用,使β中小尺度系统发展减弱。此次过程中β中小尺度系统是降水的直接成因,动能变化的正值中心对应大的降水中心。In this study,the MCS process under the background of Northeast Cold Vortex is simulated using the WRF model.A Barnes filter is used to decompose the model data into three scales,which are then substituted into the corresponding energy equation for calculation.Next,the development process of MCS,energy conversion of multi-scale system,and relationship between kinetic energy and precipitation are studied from the perspective of energy.The research results show that in this process a large amount of potential energy is transferred to kinetic energy,which provides energy for the development of the system.During the development of convection cell to MCS forming,the large scale kinetic energy in the middle and lower layers decreased,while the large-scale kinetic energy changed the small-and medium-scale kinetic energy,which in turn promoted the development of the convective monomer.The enhancement of large-scale kinetic energy in the upper layer corresponds to that of the upper jet stream,and promotes the development of the convection system.The β mesoscale system performs kinetic energy transfer to the α mesoscale system in the middle layer,which promotes the formation of the MCS.During the formation and development of the MCS,the conversion of potential energy at various scales to kinetic energy at the α and β mesoscales reached its maximum.During the MCS weakening phase,the large-scale system and the α mesoscale system have a certain inhibitory effect on the β mesoscale system at the middle and upper levels,thus weakening the development of the β mesoscale system.In this process,the β mesoscale scale system acts as the direct cause of precipitation,while the positive center of kinetic energy change corresponds to the large precipitation center.

关 键 词：东北冷涡 MCS 多尺度 能量 相互作用 

分 类 号：P458[天文地球—大气科学及气象学]