摘要
利用NCEP/NCAR再分析资料、历史天气图与青藏高原低涡切变线年鉴,在普查和分析1998-2012年持续强影响青藏高原低涡移出高原与持续强盛时的500 hPa环流形势及影响系统的基础上进行了分类,并对不同类型的持续强影响高原低涡在移出高原与持续强盛时的物理场进行了合成与对比分析。结果表明:持续强影响高原低涡以两高切变东阻型对中国降水影响最大,主要影响河套地区,切变线类、热带低压影响型、低槽前部类主要影响地区分别是黄淮流域、西南地区、长江流域;持续强影响高原低涡移出高原后,对40°N以北环流形势依赖性不强,主要是受高原低涡周边对流层中层西风带天气系统、副热带天气系统与热带天气系统相互作用造成的。研究分析还揭示了各类高原低涡移出高原后持续的对流层中层共同的大尺度条件及其主要差异。
By using NCEP/NCAR reanalysis data,historic weather maps and Tibetan Plateau vortex and shear line yearbooks from 1998 to 2012,on basis of investigation and analysis of the sustained departure Plateau vortexes(SDPVs) with strong influence and their puissant period general circulation and weather systems affected them.The SDPVs are sorted into four types.Furthermore,the composite analysis and comparison analysis of physical field are carried out of different SDPVs with strong influence.The research shows:The SDPVs with strong influence of east blocking with shearing in two highs type has the greatest influence to China rainfall and mainly influences the Hetao area.The shearline type,tropical low impact type and foreside low trough type mainly influence areas are respectively the Huanghuai valley,southwest region,Changjiang river valley.The SDPVs with strong influence is not relied on the north of 40°N circulation after moved out of the plateau.They are mainly influenced by the interaction of middle level tropospheric western wind weather systems,sub-tropical weather systems and tropical weather systems near the SDPVs with strong influence.The middle tropospheric level large scale conditions of sustained departure plateau vortex types and the differences between them are revealed.
出处
《高原气象》
CSCD
北大核心
2015年第6期1540-1555,共16页
Plateau Meteorology
基金
国家自然科学基金项目(41275052
91332715)
国家重点基础研究发展计划(973)项目(2012CB417202)
关键词
青藏高原低涡
移出高原
持续
对流层中层
环流特征
Plateau vortex
Departure from the plateau
Sustain
Middle tropospheric level
Circulation Feature
