Analysis Of Spatial And Temporal Distribution Characteristics And Influencing Factors Of SO₂ Based On OMI In Western China

After entering the 21st century,the global economy has entered a stage of rapid development,and its scale has expanded year by year and its growth rate has accelerated.However,theecologicalenvironmenthasbeendestroyedand environmental problems have emerged,especially in some developing and underdeveloped countries?regions?.Reserves are decreasing year by year.The government,the people,the experts and scholars at home and abroad also realize that regional sustainable development is inseparable from the ecological environment,which is the key to sustainable regional development.SO₂ is indispensable in trace gases and can also form acid rain.Especially in the southern part of China,acid rain disasters occur frequently,and human health is highly vulnerable to high concentrations of SO₂.Therefore,this paper analyzes the temporal and spatial distribution of tropospheric SO₂ and its influencing factors by interpreting satellite remote sensing SO₂ data.The obtained SO₂ data is filtered in the Visan program,and the filtered data is processed and processed by HDF-view software.The processed SO₂data is formatted by Arcgis software,and the Kriging interpolation method is used for interpolation.The mask,averaging and other treatments obtained the annual average,seasonal average and monthly average of the study area and plotted the corresponding spatial distribution map.Finally,the interannual and monthly trends of the provinces and cities in the western region were analyzed.Correlation analysis of natural factors such as meteorological factors,vegetation coverage and topographical conditions,and human factors such as regional GDP,primary industry added value,secondary industry added value,industrial added value,and vehicle holdings,and SO₂ column concentration values Discuss the reasons for the spatial and temporal distribution of tropospheric SO₂ in the western part of the region.The spatial characteristics of SO₂ in the western region from 2010 to 2017 are as follows:the spatial distribution has obvious gradients,and the northern part shows a high concentration distribution centered on Shaanxi and Ningxia,with a distribution pattern from east to west and decreasing from north to south;The high-concentration distribution centered on Sichuan Province and Chongqing City is a cyclical distribution pattern that decreases from Chongqing and Sichuan.The dynamic distribution of SO₂ column concentration in the western region from 2010 to 2017 is significant:the area of medium and high value areas shrinks from west to east,and the area of low value areas expands from west to east,mainly distributed in Xinjiang,Qinghai and most parts of Tibet;The seasonal distribution of SO₂ column concentration in 2010-2017 is obviously uneven,which is characterized by low winter and low summer.It has the distribution pattern of winter>autumn>spring>summer.The time characteristics of SO₂ in the western region from 2010 to 2017 are as follows:the concentration of SO₂ column in the western region fluctuated downward from 2010 to 2017,and the column concentration value ranged from 0.13DU to 0.2DU,and the annual average decrease of the concentration value was 1.8%,the average annual rate of decline is 0.015DU.The concentration of SO₂ column in the western region is higher than that in the other three seasons in winter.The average annual mean value of the season is:winter?0.16DU?>autumn?0.14DU?>spring?0.13DU?>summer?0.11DU?.The monthly mean value of SO₂ column concentration in the western region from 2010 to 2017 is“V”type,which basically conforms to the sinusoidal distribution characteristics.From January to December,the SO₂ column concentration values are all around 0.1DU,and the overall trend of SO₂ column concentration It is the first fluctuation and the volatility rises.Through the spatial correlation analysis of the annual average tropospheric SO₂column concentration in 2010-2017 and the meteorological factors from 2010 to 2017in the study area,the humidity,precipitation,temperature and wind speed in the study area are positively and negatively correlated with SO₂ in the western region.According to the correlation analysis between NDVI and SO₂,the correlation coefficient is 0.81.The vegetation coverage in the study area is low in the southeast and northwest,while the concentration of SO₂ column is low in the southeast and northwest,indicating that the vegetation has the function of absorption,degradation and purification of SO₂ in the atmosphere.Through the annual average of the tropospheric SO₂ column concentration in the study area from 2010 to 2001,and the SO₂ column concentration values of Urumqi,Lanzhou and Chongqing,and the regional GDP,the added value of the primary industry,the added value of the secondary industry,and the industrial added value.The correlation coefficient R² of the carownershipis0.507,0.476,0.345,0.4829,0.3981;0.9818,0.983,0.8074,0.5905,0.8933 and 0.9039,0.8874,0.9112,0.9342,0.865.respectively.In addition to the relatively low correlation of Urumqi,Lanzhou City and Chongqing City have high correlation,so the change of SO₂ column concentration value is closely related to human activities.