Analysis Of Aerosol Types Based On Global AERONET Ground Observations

Identified four kinds of basic aerosols among 52 stations around the world by utilizing particle linear depolarization ratio(PLDR)and single scatter albedo(SSA)in 1020 nm from AERONET(Aerosol Robotic Network)Level 2.0 dataset,investigate their spatial and temporal distribution,their radiative forcing efficiency properties,and the result will be compared with VIIRS(Visible Infrared Imaging Radiometer Suite)Deep Blue production.The results reveal that the area with large magnitude of net radiative forcing from dust and dust dominated aerosols and pollution dominated mixture are mainly located at western of Africa,Arabian Peninsula.South Africa,South America and northern of Australia is the major emission source of strongly absorbing aerosols.High values of net radiative forcing from weakly absorbing aerosols are exist in the eastern of Asia,India and Nepal region.The spatial distribution of four kinds of aerosols from VIIRS Deep Blue production is similar to those from AERONET.In the 20 stations among typical area locate at eastern of Asia and Southeast Asia,the article obtains several categories of aerosols by the more accurate classification,and further analyze the spatial and temporal distribution,radiative forcing from fine mode and coarse mode aerosols in multiple levels of atmosphere,the seasonal variation of AAE(absorption Angstr(?)m exponent),AAOD(absorption aerosol optical depth),net radiative forcing and radiative forcing efficiency from coarse mode and fine mode aerosols.There is large magnitude of strongly absorbing aerosols in the northern of China during November to February,producing more net radiative forcing in winter.In the Southern of China,the values of net radiative forcing form coarse and fine mode aerosols reach to minimum(20.3W/m~2 and 35.7 W/m~2).Compared with northern of China,coarse mode aerosols play a dominated rule in northwestern of Asia,while fine mode aerosols are prevailed in September.Accompany with the frequent biomass burning to the southern of Qinghai-Tibet Plateau in September,Lumbini station with the highest net radiative forcing efficiency(110.3 W/m~2)from fine mode aerosols in autumn.In Southeast Asia,strongly absorbing aerosols and non-absorbing aerosols takes up high proportion during winter and summer,respectively.Lastly,the article analyzes the 72 hours backward trajectory of aerosols mass and fire point data under the condition of different aerosol incidents among three stations by the use of Hysplit(hybrid single-particle Lagrangian integrated trajectory model),wind field and Fire Information for Resource Management System,improve the understanding about several kinds of aerosols incident in Asia typical areas.