Annual distributions and sources of Arctic aerosol components, aerosol optical depth, and aerosol absorption

摘要: Radiative forcing by aerosols and tropospheric ozone could play a significant role in recent Arctic warming. These species are general poorly accounted for climate models. We use the GEOS-Chem global chemical transport model to construct 3-D representation of that is consistent with observations can be used simulations. focus on 2008, when extensive were made from different platforms as part International Polar Year. Comparison aircraft, surface, ship cruise suggests provides successful year-round simulation black carbon (BC), organic (OC), sulfate, dust aerosol. BC has major fuel combustion boreal fire sources, OC mainly fires, sulfate mix anthropogenic natural mostly Sahara. The simulating aerosol optical depth (AOD) Aerosol Robotics Network stations Arctic; sharp drop spring summer appears driven smaller size summer. contribution AOD factor 4 larger than sulfate. Simulation absorbing (AAOD) indicates non-BC (OC dust) contributed 24% AAOD at 550 nm 37% mass deposited snow pack 2008. Open fires half deposition snowpack.