Difference Of Relationship Between Tropopause Pressure And Total Ozone In Tropical And Extratropical Regions

In terms of reanalysis(ERA-Interim)monthly data by the European Centre for Medium-Range Weather Forecasts(ECWMF)for the period 1979-2016(38-yr)and according to the temperature lapse rate interpolation method,the tropopause pressure of global are calculated.The climatic distribution characteristics of global tropopause pressure and total column ozone are analyzed,and the causal relationship between tropical and extratropical regions is mainly discussed on the basis of the analysis of the correlation between them.The possible mechanism between tropopause pressure and total column ozone is explained according to different regions.The results shows that:(1)The global tropopause pressure and total column ozone are basically zonal distribution,The variation of total ozone in the tropics is stronger than tropopause,while in the extratropical region it is the opposite,in the last 38 years(1979-2016)both show a downward trend,tropical region tropopause pressure and total column ozone trend of seasonal change is not obvious;The decrease of total column ozone(tropopause pressure)was the most severe in the northern hemisphere in spring,in the southern hemisphere in autumn and winter(summer and autumn)decreased amplitude was fierce.(2)In the tropical region(10°S~10°N,120°W~160°E),there is a significant positive correlation between the tropopause pressure and the total column ozone,and the effect of the total column ozone on the tropopause pressure may be due to the increase(decrease)of the total ozone.This leads to a(increase)decrease in the absorption of radiation,resulting in an increase(decrease)in stratospheric thickness and,in turn,an increase(decrease)in tropopause pressure.(3)Changes in tropopause pressure in the high latitudes of the Southern Hemisphere(60°S~75°S,90°E~150°E)will result in changes in the total ozone,resulting in negative(positive)anomalies in ascending motion due to positive(negative)anomalies in the tropopause pressure in the Southern Hemisphere.When the average stratospheric temperature increases(decreases),resulting in an increase(decrease)in ozone content.(4)The Arctic region(80°N~90°N,90°W~90°E is also the effect of tropopause pressure on ozone.The variation of total ozone and tropopause pressureis directly related to polarvortex and stratospheric temperature,and with the increasing of polar vortex,the temperature of the stratosphere decreases.Tropospheric pressure gradually decreased,ozone depletion increased,resulting in a decrease in total column ozone.