Constraining global aerosol emissions using POLDER/PARASOL satellite remote sensing observations

Chen, Cheng; Dubovik, Oleg; Henze, Daven K.; Chin, Mian; Lapyonok, Tatyana; Schuster, Gregory L.; Ducos, Fabrice; Fuertes, David; Litvinov, Pavel; Li, Lei; Lopatin, Anton; Hu, Qiaoyun; Torres, Benjamin

We invert global black carbon (BC), organic carbon (OC) and desert dust (DD) aerosol emissions from POLDER/PARASOL spectral aerosol optical depth (AOD) and aerosol absorption optical depth (AAOD) using the GEOS-Chem inverse modeling framework. Our inverse modeling framework uses standard a priori emissions to provide a posteriori emissions that are constrained by POLDER/PARASOL AODs and AAODs. The following global emission values were retrieved for the three aerosol components: 18.4 Tg yrinline-formula−1 for BC, 109.9 Tg yrinline-formula−1 for OC and 731.6 Tg yrinline-formula−1 for DD for the year 2010. These values show a difference of inline-formula+166.7 %, inline-formula+184.0 % and inline-formula−42.4 %, respectively, with respect to the a priori values of emission inventories used in “standard” GEOS-Chem runs. The model simulations using a posteriori emissions (i.e., retrieved emissions) provide values of 0.119 for global mean AOD and 0.0071 for AAOD at 550 nm, which are inline-formula+13.3 % and inline-formula+82.1 %, respectively, higher than the AOD and AAOD obtained using the a priori values of emissions. Additionally, the a posteriori model simulation of AOD, AAOD, single scattering albedo, Ångström exponent and absorption Ångström exponent show better agreement with independent AERONET, MODIS and OMI measurements than the a priori simulation. Thus, this study suggests that using satellite-constrained global aerosol emissions in aerosol transport models can improve the accuracy of simulated global aerosol properties.



Chen, Cheng / Dubovik, Oleg / Henze, Daven K. / et al: Constraining global aerosol emissions using POLDER/PARASOL satellite remote sensing observations. 2019. Copernicus Publications.


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