Spatial-Temporal Distribution Of Ozone And Its Influencing Factors In China Based On OMI Data

Ozone as one of the important component of the atmosphere,the global ecological environment and the plants and animals have great connection with human survival and development,with the development of the human society industrialization process,it brings not only social progress but also environmental pollution.Among them,atmospheric pollution has a direct impact on human activities.As an important participant and generator of photochemical smog pollution,ozone content in the atmosphere has long exceeded the standard and is one of the important pollutants in the atmospheric environment.Since the 18 th National Congress of the CPC,we have vigorously advocated the construction of ecological civilization.Premier Li Keqiang also put forward the slogan of "defending the blue sky" at the 5th session of the 12 th national people's congress.Therefore,mastering the changes of ozone concentration in the atmosphere,the spatial and temporal distribution characteristics,the influencing factors and the scale of influence is conducive to the relevant departments to make the correct response and prevention mechanism,at the same time,is beneficial to improve the quality of ecological environment and people's living standards.Compared with ground data monitoring,remote sensing satellite monitoring can obtain more regional and spatial data on a continuous time scale,which is convenient for the analysis and research of related indicators in a large range.This paper takes the whole country as the research area,USES the OMIO3 monitoring data feedback from the OMI sensor on Aura satellite,selects,processes,calculates and maps the ozone remote sensing data from 2010 to 2018 through software such as hdf-view,ArcGIS,Origin and VB program,and makes correlation analysis and evaluation based on the NDVI vegetation index,temperature,precipitation and various factors affecting human activities in the corresponding year.At the same time,the country is roughly divided into three regions,and the monthly,seasonal and annual variation characteristics of the total ozone concentration in each region are studied.Through the research,it is found that the overall ozone concentration of the whole country from 2010 to 2018 increases with the increase of latitude,and gradually decreases from northeast to southwest,with qinling mountain huai river as the boundary,it can be divided into high and low ozone concentration areas..The nine-year averagemaximum value was 360.678 DU,and the minimum value was 260.649 DU.The total ozone concentration was always high in the northeast of the three eastern provinces and Inner Mongolia,and low in the southwest of xizang and yunnan.;The distribution of ozone concentration levels was the most in spring,which was the only season with high values,and the number of ozone concentration levels was the least in autumn.The overall ozone concentration in the first half of the year was higher than that in the second half of the year.In terms of time change,the variation of total ozone concentration in China decreased in the past 9 years,but the range was small.The average concentration was the highest in 2011 and the lowest in 2016.In terms of seasons,the values of ozone concentration from large to small are spring,summer,winter and autumn.Monthly changes,the highest in February,the lowest in December.The analysis of the variation of ozone concentration between different regions shows that the monthly mean variation of ozone concentration is > in the north and > in the south.Seasonal aspect,the four seasons of the highest concentrations of ozone seasons are spring,this is the three regions have in common,and the Tibetan region is one of the most obvious seasonal variation.Years change,the annual average peak appeared in2010,the northern region is most obvious gap between the maximum and minimum and mean annual.Influence factors analysis,the monthly mean temperature and precipitation and nearly nine years the ozone concentration is present a positive and negative correlation between the mean,with a slightly stronger positive correlation,and their influences are related to topography,latitude and monsoon circulation.The overall negative correlation between vegetation index NDVI and monthly average ozone concentration occupies a large area,among which the positive correlation is stronger in northwest China,which is related to weak human influence,little vegetation cover in drought climate and high ultraviolet radiation.In terms of human factors,SO2 and NO2 emissions,as well as the growth rate of total petroleum consumption,were strongly positively correlated with the national ozone concentration,while the negative factors were strongly correlated with the natural growth rate of population,the growth rate of civilian car ownership and hot water heating capacity.Among the remaining 13 human factors,the positive and negative correlation was relatively weak.