A Study Of The Impact Of Tropical Indian Ocean Temperature On The Ozone Layer In East Asia Region

This article uses monthly mean reanalysis data such as SST,ozone and atmospheric circulation provided by the Hadley Center of the United Kingdom,NASA,NCEP/NCAR from 1980 to 2015,discussion on the Multi-scale characteristics of the two main modes of sea temperature variation in the tropical Indian Ocean,analysis the effects of changes in the tropical Indian Ocean's sea surface temperature on the distribution of the ozone layer in East Asia,focusing on the relationship between tropical stratospheric ozone distribution and the tropical Indian Ocean basin model(IOB)and dipole(IOD),at the same time,this paper also discusses the dynamic transport of atmospheric ozone to the Hadley circulation and residual circulation in the Northern Hemisphere,then explores the intrinsic mechanism of the tropical Indian Ocean SST variation affecting the distribution of ozone layer in East Asia.The results show:The SST changes in the tropical Indian Ocean have seasonal,interannual,and other multi-scale changes,the IOB has a significant linear growth trend;the IOD positive and negative phases have weakened after 2002;the IOB and IOD have significant interannual variations of less than 8 years.In the 36-year period studied,no long-term changes in components were observed for more than 10 years.The changes of the SST in the tropical Indian Ocean have a significant impact on the distribution of the ozone layer in East Asia,and it is particularly evident at the heights of 70 hPa and 40 hPa in the stratosphere in spring and autumn.Specifically,when the positive(negative)IOB occurs,the SST in the tropical Indian Ocean will be warm(cold),and the stratospheric ozone content will be reduced(increased)in the low latitudes in East Asia,and the ozone content will increase(decrease)in the mid-latitudes in East Asia;When a positive(negative)IOD occurs,the SST in the tropical Indian Ocean will show western warm(cold)and cold east(warm),the ozone content in middle and low latitudes of East Asia will increase(decrease).The results ofthe study also show that although the impact of ENSO signals at low latitudes has been demonstrated,it will not cause a fundamental change in the process of the influence of the tropical Indian Ocean SST variations on the distribution of the ozone layer in East Asia.When a positive(negative)IOB occurs,the Hadley circulation in the Northern Hemisphere will increase(decrease),the residual circulation will also increase(decrease),which will result in the atmospheric circulation strengthening(weakening)of ozone transport,and thus affecting the ozone layer in East Asia.Distribution situation.When a positive(negative)IOD occurs,the Hadley circulation in the Northern Hemisphere will weaken(enhance),and the residual circulation will also weaken(enhance),which will lead to the weakening(strengthening)of the advection flow of the atmospheric circulation to ozone and affecting East Asian region.This will eventually affect the spatial and temporal distribution of the atmospheric ozone layer.