A Study Of The Impact Of Modoki Events On The Circulation Field And Atmospheric Ozone Layer In Winter In Asia Pacific Region

The Modoki event play an important role in the circulation field of atmosphere in the Asian-Pacific region,and the temperature of stratosphere as a key reason to climate change is determined by the content of ozone.Based on the former research to understand that Modoki event and ozone content are both more obvious in winter,so I want to find the correlation between SSTA and ozone differences during Modoki events in winter.The analysis data come from Hadley Center and NCEP(National Centers of Environment Prediction),total column Ozone data come from ECMWF and ozone layer data come from NOAA-MERRA.el.The 36 winters are classified into three time periods(El-Nino Modoki.La-Nina Modoki and Normal Year)through 0.7 the seasonal standard deviation to the analysis of typical characteristics of different periods,got the following conclusions:1,The average longitude circle circulation structure are completed during winter of the three period,especially Hadley circulation,and the positive center is located near 10°N,negative center is located in 30°N;2,The ozone content in low latitude tropical is generally lower,the total ozone of central Pacific in El-Nino Modoki is less,compared with the La-Nina Modoki winter;3,During different periods of Modoki,the location of the total ozone maximum center is roughly located in 500hPa geopotential height in the East Asia trough;4,The region of winter total ozone anomaly was changed with negative EMI in the Middle-east Equator Pacific Ocean obviously and the significant region of analysis and synthesis of ozone were the same,so regard the area(180-120°W,10-30°N)as Modoki ozone sensitive areas;5,The different model of EOF-1 in different periods of SST anomalies present the largest difference in the Western Pacific(140 °E-140°W,26°-46°N),as the key area SST anomaly;6,The variance contribution rate of first modal of SVD analysis was 84.75%,the modal correlation coefficient as high as 0.71,the changes of SST in the east of Japan and the North Pacific are negatively related to total ozone of the ozone key area during the El-Nino Modoki.There was a significant area located in the central North Pacific Area arc distribution during the La-Nina Modoki period 'The variance contribution rate was 76.83%and the two modal correlation coefficient was 0.51 with positive correlationbetween SST and ozone;7,The results of SVD between total ozone of ozone key area and SST in A region showed that in most areas of ozone and SST show a negative correlation and The distribution of correlation coefficient El-Nino Modoki was also closed to the period of the background;8,During the winter of El-Nino Modoki,the tropopause height was higher than that during the winter of La-Nina Modoki overall,and the maximum different value over 500m in the east of ozone key area.The zonal mean height of the tropopause is lower than that of the other two periods in the La-Nina Modoki period.;9,The backward trajectory analysis of the ozone critical region also indicates that the upper vertical air mass in the area is mainly from the mid latitude region in accordance with the northwestern critical-area of SST;10,The change of SST in the North Pacific were consistent during the period of ozone increase or decrease in El-Nino Modoki and La-Nina Modoki,especially in the northwestern area of the Pacific Ozone anomaly increased when the SSTA increase and the ozone anomaly reduced when the SSTA decreased.