Tracking Surface Cyclones with Moist Potential Vorticity  

作　　者：Zuohao CAO Da-Lin ZHANG 

机构地区：[1]Meteorological Service of Canada, Ontario, Canada Department of Meteorology, University of Maryland, College Park, Maryland

出　　处：《Advances in Atmospheric Sciences》2004年第5期830-835,共6页大气科学进展（英文版）

摘　　要：Surface cyclone tracks are investigated in the context of moist potential vorticity (MPV). A prognostic equation of surface absolute vorticity is derived which provides a basis for using negative MPV (NMPV) in the troposphere as an alternative approach to track surface cyclones. An observed case study of explosive lee cyclogenesis is performed to test the e?ectiveness of the MPV approach. It is shown that when a surface cyclone signal is absent due to the blocking of the Rocky Mountains, the surface cyclone can be well identi?ed by tracing the peak NMPV.Surface cyclone tracks are investigated in the context of moist potential vorticity (MPV). A prognostic equation of surface absolute vorticity is derived which provides a basis for using negative MPV (NMPV) in the troposphere as an alternative approach to track surface cyclones. An observed case study of explosive lee cyclogenesis is performed to test the e?ectiveness of the MPV approach. It is shown that when a surface cyclone signal is absent due to the blocking of the Rocky Mountains, the surface cyclone can be well identi?ed by tracing the peak NMPV.

关 键 词：cyclone track moist potential vorticity lee cyclogenesis 

分 类 号：P4[天文地球—大气科学及气象学]