A deep stratospheric intrusion associated with an intense cut-off low event over East Asia  

作　　者：LI Dan BIAN JianChun FAN QiuJun 

机构地区：[1]Key Laboratory of Middle Atmosphere and Global Environment Observation,Institute of Atmospheric Physics,Chinese Academy of Sciences [2]College of Earth Science,University of Chinese Academy of Sciences

出　　处：《Science China Earth Sciences》2015年第1期116-128,共13页中国科学（地球科学英文版）

基　　金：supported by the National Basic Research Program of China(Grant No.2010CB428602);the National Natural Science Foundation of China(Grant No.41175040)

摘　　要：European Centre for Medium-Range Weather Forecasts Re-Analysis Interim(ERA-Interim)reanalysis data and satellite data,and trajectory model were applied to analyze the dynamical,thermo-dynamical,and chemical structure in the upper troposphere and lower stratosphere(UTLS)of an intense cut-off low(COL)event occurring over East Asia during June 19-23,2010,and to characterize the process and transport pathway of deep stratospheric intrusion.The Atmospheric Infrared Sounder(AIRS)ozone data and the Global Positioning System Ozone(GPSO3)sonde data showed that the air mass originating from the polar formed a region with relatively high values of potential vorticity(PV)and ozone in the center of COL,and a secondary ozone peak appeared in the upper troposphere during mature stage of the COL.Forward trajectory simulation suggested that during the first stage of COL,deep stratospheric intrusion associated with strong northerly wind jet on the west side of the upper-level trough transported ozone-rich air from the polar lower stratosphere into the middle and lower troposphere in the mid-latitude,and increased the ozone concentration there.During the mature stage of the COL,stratospheric air was transported counterclockwise into the troposphere.Backward trajectory model was used to find the source regions of air mass within the COL during its mature stage.Model results show that air masses with high ozone concentration in the center of the COL have two source regions:one is the subpolar vortex which lies in northern part of Center Siberia,where ozone-rich air plays a major role in increasing the ozone concentrations,and the other is the strong shear region which is near by the cyclonic side of the extratropical jet axis(west of 90°E,near 50°N).The air masses with low ozone concentration around the COL also have two source regions:one is the anticyclonic side of the extratropical jet axis,where the air mass with the relatively low ozone concentration at the bottom of the COL is mainly controlled by horizontal movement,and the European Centre for Medium-Range Weather Forecasts Re-Analysis Interim （ERA-Interim） reanalysis data and satellite data, and trajectory model were applied to analyze the dynamical, thermo-dynamical, and chemical structure in the upper tropo- sphere and lower stratosphere （UTLS） of an intense cut-off low （COL） event occurring over East Asia during June 19-23, 2010, and to characterize the process and transport pathway of deep stratospheric intrusion. The Atmospheric Infrared Sounder （AIRS） ozone data and the Global Positioning System Ozone （GPSO3） sonde data showed that the air mass originating from the polar formed a region with relatively high values of potential vorticity （PV） and ozone in the center of COL, and a second- ary ozone peak appeared in the upper troposphere during mature stage of the COL. Forward trajectory simulation suggested that during the first stage of COL, deep stratospheric intrusion associated with strong northerly wind jet on the west side of the upper-level trough transported ozone-rich air from the polar lower stratosphere into the middle and lower troposphere in the mid-latitude, and increased the ozone concentration there. During the mature stage of the COL, stratospheric air was trans- ported counterclockwise into the troposphere. Backward trajectory model was used to find the source regions of air mass within the COL during its mature stage. Model results show that air masses with high ozone concentration in the center of the COL have two source regions： one is the subpolar vortex which lies in northern part of Center Siberia, where ozone-rich air plays a major role in increasing the ozone concentrations, and the other is the strong shear region which is near by the cyclonic side of the extratropical jet axis （west of 90~E, near 50~N）. The air masses with low ozone concentration around the COL also have two source regions： one is the anticyclonic side of the extratropical jet axis, where the air mass with the relatively low ozone concentration at the

关 键 词：deep stratospheric intrusion cut-off low stratosphere-troposphere exchange 

分 类 号：P421.32[天文地球—大气科学及气象学]