Research On Pollution Characteristics Of PM₁₀ In Jinan And Inversion Of Aerosol Optical Thickness

With rapid development of economy，the pollution of the atmosphere becomes more and moreserious．In most of cities，PM₁₀becomes the critical pollution which affects the air quality．Thesatellite remote sensing retrieval method has much more advantages in comparing with thetraditional detection，such as convenient accessing to information，wide area coverage，fastdetection etc．It can also be more efficient in accessing information of atmospheric．This paper takes mass concentration of PM₁₀of Jinan during the whole 2010，and takes thesame time day after day meteorological element observed value and gets the dependence of PM₁₀concentration and different meteorological elements．Then calculate aerosol optical depth basedon MODIS data of 2010．Then proceed the regression analysis by multiple methods for visibilityand AOD，and for mean value of PM₁₀and AOD．At last，retrieval the aerosol optical thicknessover the Jinan city in four seasons.The main conclusions are as follows：（1）The extended dense dark vegetation algorithm is suit to retrieval the aerosol opticalthickness in Jinan. This method that find dark vegetation with less than0.125can find dispersion dark vegetation in Jinan.（μis the cosine of satellite zenithangle）（2）The aerosol model in this paper is urban model, and AOD that calculated is between 0.215to 1.17, this result is in accordance with general urban aerosol concentration distribution range.（3） It’s significantly correlation between AOD and PM₁₀（R=0.74）．By comparing the fivetype of regression model between AOD and PM₁₀，it shows that the Logarithmic function modelsis the best fitting model which can reflect AOD and PM₁₀．（R2is closer to 1，standard error is thesmallest，F is the most，significance F is closr to 0）．（4）The results show that the particulate air pollution in Jinan is serious，but the overall level isimproved in recent seven years．The average PM₁₀mass concentration in spring and winter ishigher than that in autumn and summer，The concentration distribution in space shows a highZhongzizhan and Kegansuo lower feature，but interannual variability of PM₁₀concentration ofall four sites exceeds Standard II．（5） On the spatial distribution，there is one high-value area of AOD and PM₁₀which is located in the north Yellow River of Jinan.The dust AOD is the main reason．In the five districts ofJinan，Tianqiao District has the highest value of AOD and PM₁₀，the other four districts arealmost the same．On the seasonal distribution，In spring，there is a great change in space of AOD and PM₁₀because of dust and coal-burned emission．In summer，the spatial distribution of AOD and PM₁₀is uniform and stable in the five districts.In autumn，due to the harvesting of crops and strawburning，the particulate matter increase，AOD and PM₁₀is higher in urban.In winter，because ofthe increasing in emissions of air pollutants and the spread of adverse conditions，the airpollution was very serious for one year，AOD and PM₁₀is the highest in urban．（6）In autumn and winter，the relationship between PM₁₀concentration and air temperature orRH is significantly and positive correlation，but it’s not obvious in spring and summer．Therelationship between PM₁₀concentration and sunshine hours is negative correlation，Therelationship between PM₁₀concentration and wind speed is not obvious．（7）The relationship between PM₁₀concentration and inversion frequency or inversion depth orstrength is significantly and positive correlation while it’s opposite between PM₁₀concentrationand the strength of untouched ground inversion．Overall，in winter，the atmosphere dilution anddiffusion ability is the smallest，it’s adverse to air quality．...