| At present,it is more difficult to control atmospheric pollution.Improving atmospheric monitoring technologies and methods,It will help to fully grasp the current status of atmospheric SO2 in Gansu Province,the dynamic law of the distribution of pollution sources,and the relationship between SO2 column concentration and environmental factors.The prevention and control of atmospheric SO2 in Gansu Province will be significant.Based on the OMISO2 data provided by the NASA EOS-ARUR satellite-borne sensor OMI,this paper analyzes the spatial-temporal distribution characteristics of atmospheric tropospheric SO2 column concentration and its influencing factors in Gansu Province during 2008-2016,and proposes a scientific strategy for the prevention and control of sulfur dioxide pollutants.With suggestions.The results of the study are as follows:1.The spatial distribution of SO2 concentration in the atmospheric troposphere in Gansu Province is uneven,showing a tendency of high in the northwest and low in the southeast;At the same time,there are obvious high-value accumulation points,and median areas are distributed around the high-value central area.The concentration of SO2 in the eastern part of Jiuquan is the highest,followed by Jiayuguan,Jinchang,Lanzhou and Baiyin.The low value areas are mainly distributed in the southern region of Gansu Province,where Tianshui,Dingxi and Weinan are all far below the average of the province.From the numerical point of view,the SO2 column concentration ranged from 0.4292 DU to 0.7909 DU with an average value of 0.5424 DU.From the perspective of latitude and longitude,the concentration distribution of tropospheric SO2 column values in Gansu Province from 2008 to 2016 generally shows an increasing trend with increasing latitude.2.From the interannual,seasonal and monthly changes of the spatial distribution of tropospheric SO2 column concentrations in Gansu Province from 2008 to 2016:In terms of interannual variation,the high tropospheric SO2 column concentration areas are mainly concentrated in the western and central parts of Gansu,while the low values are concentrated in the south of Gansu Province.From a year-to-year perspective,the concentration of SO2 in the troposphere in 2008 shows the highest in the province in Jinchang City,as well as in Lanzhou and Baiyin,followed byQingliang City in Longdong District;In 2009,the area of tropospheric SO2 column high values narrowed to the northwest of Jinchang City and Jiuquan City;In 2010,the region with high tropospheric SO2 column concentration was expanded to the entire province;Baiyin City and the area west of Jinchang City were all high-value areas;the SO2 column volume was significantly higher than the previous two years;In 2011,the area of tropospheric SO2 column concentration decreased,mainly in the western and central regions of Jiuquan City and a small part of the eastern part of Qingyang City;High value areas in 2012-2014 all appeared in the western part of Jiuquan City;In 2015-2016,the concentration of SO2 column is still dominated by the western part of Jiuquan,and the median area is expanded to Zhangye City;the main features of “northwest high and southeast low” appear on seasonal changes;The areas with higher concentrations in spring are mainly distributed in western Gansu Province,Summer and autumn have the highest concentrations in Western Jiuquan,Followed by Jiayuguan City,Zhangye City,Lanzhou,Baiyin Area and Longdong Area;By winter,the concentration of the province is higher than the other three seasons.Jiuquan City is still the highest volume of SO2 column in the province.The rest of the region is centered on Lanzhou,Baiyin,Jinchang and Zhangye and spreads to the surrounding areas.On month-to-month changes,the high value areas were widely distributed in January,showing the distribution of the central area to the periphery,The high value areas in February are mainly in central Jiuquan,and the median areas are mainly Zhangye City,Wuwei City,Qingyang City,Pingliang City,Tianshui City,and parts of southern Jiangxi Province,In March,the median region was widely distributed,including most of Jiuquan City and Wuwei City;From April to December,the central and southern parts of Gansu Province were dominated by low-value areas,and the SO2 concentration in the northwest of Gansu Province was relatively high.3.The annual average value,seasonal mean value,and monthly average value of the spatial distribution of tropospheric SO2 column concentrations in Gansu Province have been obtained for many years.In terms of interannual variation,with the exception of 2010,the average annual value of SO2 column concentrations showed an overall downward trend,and the SO2 column values did not fluctuatesignificantly.2016 was lower than in 2008.From a year-by-year perspective,there was a slight decrease from 2008 to 2009 and a surge in 2010,reaching the maximum value of the average for the past 9 years.During the period from 2011 to 2016,the annual average value of SO2 concentration in Gansu Province increased or decreased,showing little ups and downs.For seasonal mean and monthly mean values,the SO2 column concentrations for the four seasons are ranked as:Winter> Spring> Summer>Autumn.The winter average is 1.1226 DU and the fall average is 0.2576 DU.The month-to-month variation was a "U" distribution,the maximum concentration of SO2 column appeared in February,and the minimum value appeared in September.4.Taking into account the geographic location and related conditions of the prefectures in Gansu Province and the concentration of SO2 column,the 14 prefectures in Gansu Province were divided into 5 typical areas.Their spatial and temporal distribution shows that the concentration of SO2 in all the years in Jiuquan City is the highest in the province.In the seasons,all cities are presented in spring and the concentrations of SO2 in winter are significantly higher than those in summer and autumn.One by one,the average value of Jiuquan City in each season was significantly higher than other regions,including 1.49 DU in winter.5.The main influencing factors of tropospheric SO2 column concentration are divided into natural and human factors.Natural factors include temperature,precipitation,and topographic factors;Human factors include gross domestic product per unit area,number of motor vehicles,quantity of coal,and output value of the secondary industry.The final results show that from the temperature point of view,there is a general negative correlation;from the perspective of precipitation,positive and negative correlation coexist;in regions with developed economies,Increases with increasing latitude;From the topographical perspective,there is a negative correlation with altitude;human activities are positively correlated,and regions with relatively weak economic levels have negative correlations with human activities. |
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