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A global simulation of brown carbon: implications for photochemistry and direct radiative effect

Jo, Duseong S ; Park, Rokjin J ; Lee, Seungun ; Kim, Sang-Woo ; Zhang, Xiaolu

Atmospheric chemistry and physics, 2016-03, Vol.16 (5), p.3413-3432 [Periódico revisado por pares]

Katlenburg-Lindau: Copernicus GmbH

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Título:
A global simulation of brown carbon: implications for photochemistry and direct radiative effect
Autor: Jo, Duseong S ; Park, Rokjin J ; Lee, Seungun ; Kim, Sang-Woo ; Zhang, Xiaolu
Assuntos: Absorption ; Aerosol effects ; Aerosol Robotic Network ; Aerosols ; Albedo ; Albedo (solar) ; Aromatic compounds ; Atmospheric models ; Biodiesel fuels ; Biofuels ; Biomass ; Biomass burning ; Burning ; Carbon ; Carbon aerosols ; Carbon cycle ; Carbon cycle (Biogeochemistry) ; Chemical properties ; Chemical transport ; Computer simulation ; Cooling effects ; Electromagnetic absorption ; Emissions ; Environmental aspects ; Light absorption ; Observations ; Optical properties ; Organic carbon ; Oxidation ; Ozone ; Photochemistry ; Photolysis ; Pollution monitoring ; Radiative cooling ; Scattering ; Seasonal variation ; Seasonal variations ; Simulation ; Solar radiation ; Spring ; Spring (season) ; Surface chemistry ; Three dimensional models ; Water chemistry
É parte de: Atmospheric chemistry and physics, 2016-03, Vol.16 (5), p.3413-3432
Descrição: Recent observations suggest that a certain fraction of organic carbon (OC) aerosol effectively absorbs solar radiation, which is also known as brown carbon (BrC) aerosol. Despite much observational evidence of its presence, very few global modelling studies have been conducted because of poor understanding of global BrC emissions. Here we present an explicit global simulation of BrC in a global 3-D chemical transport model (GEOS-Chem), including global BrC emission estimates from primary (3.9 ± 1.7 and 3.0 ± 1.3 TgC yr−1 from biomass burning and biofuel) and secondary (5.7 TgC yr−1 from aromatic oxidation) sources. We evaluate the model by comparing the results with observed absorption by water-soluble OC in surface air in the United States, and with single scattering albedo observations at Aerosol Robotic Network (AERONET) sites all over the globe. The model successfully reproduces the seasonal variations of observed light absorption by water-soluble OC, but underestimates the magnitudes, especially in regions with high secondary source contributions. Our global simulations show that BrC accounts for 21 % of the global mean surface OC concentration, which is typically assumed to be scattering. We find that the global direct radiative effect of BrC is nearly zero at the top of the atmosphere, and consequently decreases the direct radiative cooling effect of OC by 16 %. In addition, the BrC absorption leads to a general reduction of NO2 photolysis rates, whose maximum decreases occur in Asia up to −8 % (−17 %) on an annual (spring) mean basis. The resulting decreases of annual (spring) mean surface ozone concentrations are up to −6 % (−13 %) in Asia, indicating a non-negligible effect of BrC on photochemistry in this region.
Editor: Katlenburg-Lindau: Copernicus GmbH
Idioma: Inglês

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A global simulation of brown carbon: implications for photochemistry and direct radiative effect

Jo, Duseong S ; Park, Rokjin J ; Lee, Seungun ; Kim, Sang-Woo ; Zhang, Xiaolu

Katlenburg-Lindau: Copernicus GmbH

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