Characterization Of Atmospheric Aerosol Optical Properties And Calculation Of Radiative Forcing Based On Multi-source Remote Sensing

It has been proved the atmospheric aerosol is closely related to the air pollution.It is important to clarify the relationship between aerosol load and atmospheric condition.In addition,the aerosol particles can absorb and scatter solar shortwave radiation and earth longwave radiation,which have a significant impact on solar energy and local /global climate.The development of remote sensing can provide data for the study of aerosol,and the improvement of radiative transfer models greatly promotes the research of aerosol radiative forcing and climate effect.The ground-based remote sensing established in the early days can provide data with rich spectrum and variety,but the sites observation mode makes it unable to support the direct aerosol radiative forcing(DARF)assessment in continuous space.Although satellite remote sensing has high spatial coverage,it is difficult to be directly used for DARF assessment,because its applications vary from product to produc and parameters are incomplete.How to couple multi-source remote sensing data has become the key of regional DARF assessment.Thus,this article focuses on the development of satellite remote sensing aerosol product evaluation system and the establishment of satellite-based DARF assessment method.In this paper,the aerosol spatiotemporal trends in target region are characterized by aerosol optical properties obtained from the ground-based monitoring platform,and the analysis of aerosol radiative forcing effect is given through Santa Barbara DISORT Atmosphere Radiative Transfer model.Then,a satellite remote sensing aerosol product evaluation system is constructed based on statistical indicators to verify and compare the accuracy of different satellite datasets.Finally,a method of aerosol radiative forcing assessment based on Look-up table and satellite data is developed on the basis of selecting the optimal satellite dataset.The main results of this paper are as follows:(1)During the study period,the air quality in Harbin is poor and mainly effected by anthropogenic aerosol.The influencing factors of direct aerosol radiative forcing and aerosol radiative forcing efficiency are the pollution degree and the proportion of absorbing aerosol,respectively.(2)The satellite remote sensing aerosol product evaluation system can get the best aerosol product in different areas.The results show that dark target algorithm performs best in areas with high vegetation coverage,deep blue algorithm lies in desert arid areas with bright surface,and dark target-deep blue algorithm is prominent when land types are complex and aerosol sources are variable.(3)The DARF calculated by Look-up table is close to those by ground-based data,it shows that the satellite-based DARF assessment method has good accuracy and can support the study of aerosol radiative forcing under different conditions.