Analysis Of Total Ozone Distribution And Its Influencing Factors In Western China Based On Satellite Remote Sensing

Ozone is an important trace gas in the atmosphere.It is an important pollutant affe-cting the quality of urban atmospheric environment.Due to their role in atmospheric photochemistry and the effects on the ecological environment and human health,ozon-e has attracted widespread attention from scientists and the public.And the impact of the Western Development Strategy and the “Belt and Road” strategy.Environmental issues in the western region have also attracted more and more attention.Therefore,this paper uses western China as a research area,and uses the2007-2017 OMI remote sensing monitoring data to analyze the temporal and spatial distribution characteristics of total ozone over 11 a in the western region.And through the longitude,latitude,topography and other factors,the reasons for the distribution of total ozone concentration in the study area are analyzed and discussed.The main research conclusions include:(1)Spatial distribution: In general,from 2007 to 2017,the total amount of ozone in the western region of 11 a showed a trend of parallel distribution with latitude,and as the latitude increased,the concentration of ozone increased continuously.Interannually,from 2007 to 2011,the area of high ozone concentration is expanding,and the range of low-value areas is gradually shrinking or even missing.From 2013 to2017,the distribution areas of high-value areas gradually disappeared,and the sub-low-value areas and sub-high-value areas gradually expanded to the north.In the season,the concentration of ozone concentration in winter and spring is more distributed,and the latitude of the high value area in spring is lower than that in winter,and the distribution area is wide.In the summer and autumn,the ozone high value area is missing.In the monthly distribution,from January to June,the distribution area of the high-value area and low-value area of ozone concentration gradually narrowed to the missing area,and the range of the second-high value area and the second-low value area gradually expanded and extended to the north.From July to December,the sub-high value area and low-value area of ozone concentration were from scratch,and the area gradually expanded.(2)Time distribution: In terms of interannual variation,from 2007 to 2017,the ozone concentration first increased and then decreased,reaching a peak in 2010,which was 308.51 DU.The minimum appeared in 2017 at 278.58 DU.In the seasonal variation,there are obvious seasonal changes.The four seasons ozone concentration values are: spring>winter>summer>autumn,and the annual interannual fluctuation is the largest.On the moon,at 11 a,the monthly mean value of ozone concentration in the western region fluctuated within the range of 239~354DU,showing a sinusoidal distribution.The distribution of ozone concentration in typical provinces and cities concluded that the higher the latitude,the larger the ozone concentration value,the earlier the ozone concentration maximum occurs,and the earlier the minimum value occurs.(3)Summarize and analyze the reasons for the spatial and temporal distribution of ozone concentration in the western region.The highest concentration of ozone in2010,the highest ozone concentration in spring,and the lowest in summer and autumn are: ozone is mainly produced in the stratosphere above the equator and transported to the high latitudes through the atmospheric circulation.In the low latitude equatorial region in winter,the amount of ozone generated is large,and it is transported to the high latitude through the atmospheric circulation.The highest temperature in spring due to time lag and the lower total ozone in the northern hemisphere in autumn are opposite.(4)The analysis of the zonal variation of ozone concentration is based on the selection of three cities with different 27°N,Yulin,Jinchang and Kashi.It was found that the interannual and inter-monthly changes in ozone concentration in the three regions were consistent,and the regionally located eastward region had a slightly higher ozone concentration than the western region.The three cities of Yinchuan,Guangyuan and Guiyang were selected with 109°E longitude,and the interannual changes were found to be small,and the monthly changes were significantly different.The northern region has a larger ozone concentration than the southern region,and the ozone concentration maximum and minimum values appear earlier.Studies have shown that the difference in the total amount of ozone at the same latitude is mainly related to the latitude difference of solar radiation;and the uneven distribution of total ozone at the same latitude is mainly due to the power transmission of ozone by the planetary wave disturbance.(5)Topographical factors:27°N~33°N,75°E~113°Eareas were selected,and the seasonal spatial distribution map of ozone concentration and three different topography in the selected area(Tibet Plateau,Sichuan Basin,Middle and Lower Yangtze River Plain)were selected.The monthly mean value of ozone concentration shows that there is an obvious "ozone hole" in the Tibet Plateau in summer.The study believes that: power-heat is the reason for the emergence of low-value centers in the Tibet Plateau in summer.The comparison of monthly mean values of different topography shows that the monthly mean value of the middle and lower reaches of the Yangtze River and the Sichuan Basin does not change much,but the ozone concentration is higher than that of the Tibet Plateau.It is because the unique circulation form of the plateau terrain brings the low-level air with low ozone content to the upper level.,diluting the high-altitude ozone content,thereby affecting the ozone content of the entire atmospheric column.The topography of the basin is not conducive to the exchange of pollutants,and the humidity in the Sichuan Basin is conducive to photochemical reactions,so the ozone content is higher than that in the Tibet Plateau.(6)Sensitive control area: There is no VOCs control area in the whole of western region.Most of the areas are NOx control areas,VOCs-NOx coordinated control areas are mainly concentrated in the northwest,and there is almost no VOCs-NOx coordinated distribution area in the southwest.Overall,the distribution of NOx control zones is relatively stable,and the VOCs-NOx coordinated control zones are all NOx control zones.The reason is that there are some areas where the industrial distribution is concentrated in the northwest,but the climate is dry,the vegetation is sparse,and the desertification is serious.The mountainous areas in the southwest are humid,with sufficient precipitation and high vegetation coverage,so they are obviously affected by the NOx control area.