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Heating due to biomass burning aerosol is not balanced by additional TOA, and based on the observed cloud properties at Ascension Island, theĬloud albedo is not large enough to overcome this.
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WhenĬonsidered under clear conditions, the aerosol has a cooling effect at the Of the aerosol can be felt elsewhere in the atmospheric column. Within the aerosol layer above Ascension Island can locally range between 2Īnd 8 K d −1 depending on the aerosol optical properties, though impacts Values for the single-scattering albedo (SSA) demonstrate that shortwave (SW) heating RRTM with and without aerosols and a range of Lagrangian Integrated Trajectory (HYSPLIT) model. Ocean using an ensemble of back trajectories from the Hybrid Single Particle Radiative heating is also assessed across the southeast Atlantic Profiles of the radiative heating rate due to aerosols and clouds wereĬomputed. Humidity, and clouds from the field campaign alongside aerosol opticalĪnalysis for Research and Applications, Version 2 (MERRA-2), as input for the Rapid Radiation Transfer Model (RRTM), The deployment of the first Atmospheric Radiation Measurement (ARM) Mobileįacility (AMF1) in support of the Layered Atlantic Smoke Interactions with Cloudsįield campaign provided a unique opportunity to collect observations ofĬloud and aerosol properties during two consecutive biomass burning seasonsĭuring July through October of 20 over Ascension Island (7.96 ∘ S, 14.35 ∘ W). Within the aerosol layer has the potential to alter the thermodynamicĮnvironment and therefore the cloud structure however, limited work hasīeen done to quantify this along the trajectory of the aerosol plume in the Plume progresses across the southeast Atlantic Ocean, radiative heating Further uncertainties in theĬloud structure arise in the presence of biomass burning carbonaceousĪerosol, as is the case over the southeast Atlantic Ocean, where biomassīurning aerosol is transported from the African continent. Prediction and general circulation models. Stratocumulus to cumulus, are poorly represented in numerical weather Marine boundary layer clouds, including the transition from
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