Study On The Influence Of Urban Industrial Suburbanization On The Concentration Of NO₂ And SO₂ In The Troposphere On The Northern Slope Of Tianshan Mountains

The city on the northern slope of Tianshan Mountain is one of the key construction cities during the"Thirteenth Five-Year Plan".In recent years,industries have been continuously shifting to the suburbs,causing pollution to the suburban environment.Therefore,this article uses MAX-DOAS to monitor the representative cities on the northern slope of Tianshan Mountain from January 2018 to December2019:Fukang,Urumqi,Shihezi and Bole,and inverted the NO₂ and SO₂ vertical columns in the troposphere.Concentration,combined with land use images,emission inventory,industrial layout,topography,wind direction and speed,industrial GDP,etc.,the main conclusions are as follows:（1）From the perspective of industrial spatial distribution,the power and industrial sectors of cities on the northern slope of Tianshan Mountain are the sectors that contribute the most to the anthropogenic NO₂ and SO₂ emission sources of cities on the northern slope of Tianshan Mountain;the number of light industry in the cities on the northern slope of Tianshan Mountain>the number of heavy industry>the number of power plants,The total number of industries in the suburban industrial zones is less than that of the urban areas;between 2010 and 2018,the land use area of the cities on the northern slope of the Tianshan Mountains has a significant increase in other construction land areas,and the urban industries on the northern slope of the Tianshan Mountains are mostly vertical in space.Mainly distributed,industrial areas are now mostly located in the suburbs of cities,and the suburban industrial areas are mostly dominated by heavy industries,while the urban areas are mostly dominated by light industries,and the phenomenon of industrial suburbanization is obvious.（2）From the analysis of the time changes of NO₂ and SO₂ concentrations in the troposphere of the study area,the daily variation range of NO₂ vertical column concentration in the study area is 0.87-38.57×10¹⁵molec·cm^-2,and the daily variation of atmospheric tropospheric SO₂ vertical column concentration The range is1.01-16.85×10¹⁵ molec·cm^-2,all presenting the characteristics of"high in the morning and evening,low at noon".The vertical column concentration of NO₂ and SO₂ in the troposphere in winter is the highest and the range of change is the largest,and the vertical column concentration of NO₂ and SO₂ in the troposphere in summer The lowest and the trend of change is relatively gentle.（3）From the analysis of the spatial changes of atmospheric tropospheric NO₂ and SO₂ concentrations in the study area,the urban atmospheric tropospheric NO₂ and SO₂ vertical column concentrations on the northern slope of the Tianshan Mountains are mostly in urban areas smaller than suburban industrial areas.The characteristic of“low summer”;the concentration of NO₂ in the vertical troposphere column is higher than the concentration of SO₂ in the troposphere,and there is little difference in the concentration of atmospheric SO₂ between cities on the northern slope of Tianshan Mountain;Urumqi has the highest concentration of NO₂ in the troposphere,and the closer the atmosphere is to the surrounding areas The concentration of NO₂ in the troposphere is also relatively high;the more remote cities are to the west,the concentration of SO₂ in the troposphere is relatively higher.（4）From the analysis of the influence of industrial suburbanization on the atmospheric tropospheric NO₂ and SO₂ concentration in the study area,the cities on the northern slope of Tianshan Mountains are dominated by westerly and northerly winds of 1-7m/s.They are all valley-type and have large temperature differences.Air pollutants that produce an inversion layer are not easy to diffuse;due to different industrial layouts,air pollution in other research areas except Bole City will increase when westerly winds;2005-2018 total industrial GDP:Urumqi City>Shihezi City>Fukang City>In Bole City,the industrial GDP of the study area is positively correlated with atmospheric NO₂ concentration,but only Shihezi City has a significant positive correlation（p<0.05）,and industrial GDP has a significant negative correlation with atmospheric SO₂ concentration（p<0.05）,Urumqi City showed a very significant negative correlation（p<0.01）and Bole City showed a significant positive correlation（p<0.05）.The urban industrial SO₂ emission reduction effect on the northern slope of the Tianshan Mountains is better,and the industrial NO₂ emission reduction efforts should continue to be strengthened.