| Recently,with the development of economy,the air quality in most cities of our country is declining day by day.Aerosol particles contained in the atmosphere,which optical thickness can reflect the air quality of pollution,to a certain extent.Therefore,it is of great practical significance to research the distribution of aerosols,characteristics of aerosols,the radiation effects and environmental effects of aerosols.In this paper,the aerosol distribution in Yunnan area is studied by using The Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation(CALIPSO)lidar of the National Aeronautics and Space Administration(NASA)and AERONET(Aerosol Robotic Network)observation network.The time span is from 2013 to 2015,the aerosol distribution in Yunnan area(21 N-30 N,97 E-107 E)was studied in time,space and vertical direction.The main conclusions are as follows:(1)Compared the CALIPSO aerosol products with CE318 aerosol data,the results show that the two trends in the distribution of spatial and temporal are more consistent,but the value of CALIPSO is slightly lower than the value of CE318.(2)In generally,the AOD in Yunnan province is low,the difference of AOD space is significant,the aerosol have a higher distribution in the south than north.(3)There is a large frequency of smoke aerosol in Yunnan area,followed by polluted dust aerosol.There are few clean continental aerosol and clean marine aerosol in Yunnan area.(4)In the atmosphere of 4-6km in Yunnan,the four seasons of the scattering coefficient,the average of spring is the largest,which indicates that the source of aerosol in spring is mainly from 4-6km.In the atmosphere of 0-2km in Yunnan,the four seasons of the scattering coefficient,the average of summer is the largest,which indicates that the source of aerosol in summer is mainly from the near surface.In the autumn and winter,the mean values of attenuated backscatter coefficient are all the lowest.(5)There are more irregular particles in summer,but more regular particles in spring.(6)The color ratio of aerosol is mainly concentrated in 0.47-0.53.Particle size is larger within the range of 4-6km than 0-4km.On the one hand,it is affected by the dust aerosol,on the other hand,it may be interfered by the thin cloud particles in the upper layer,resulting color ratio is slightly larger than the other two layers in 4-6km.(7)The maximum value of the aerosol extinction coefficient in the four seasons of spring,summer,autumn and winter are all within the range of 0.5km and below,and the maximum value of the relative humidity and the inversion layer correspond well within the height range below 0.5km.(8)In January 19,2014,between 1-2.3km,the concentration of aerosol is the largest,the scattering is the strongest,and the aerosol concentration decreased with the increase of height,in the range of 4km height,there are irregular fine particles.In January 19th,the main dust aerosol is smoke aerosol.Analysis of the meteorological factors in January 19,2014,the wind speed is very small or static wind weather easily lead to the accumulation of aerosol concentration.Changes in relative humidity can lead to the emergence of larger aerosol extinction coefficients,and temperature inversion may lead to the formation of the vertical structure of multilayer aerosols. |
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