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  Aerosol absorption and radiative forcing

Stier, P., Seinfeld, J. H., Kinne, S., & Boucher, O. (2007). Aerosol absorption and radiative forcing. Atmospheric Chemistry and Physics, 7, 5237-5261. doi:10.5194/acp-7-5237-2007.

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 Creators:
Stier, P.1, 2, Author              
Seinfeld, J. H., Author
Kinne, S.1, 3, Author              
Boucher, O., Author
Affiliations:
1The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society, ou_913550              
2IMPRS on Earth System Modelling, MPI for Meteorology, Max Planck Society, Bundesstraße 53, 20146 Hamburg, DE, ou_913547              
3Observations and Process Studies, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society, ou_913575              

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 Abstract: We present a comprehensive examination of aerosol absorption with a focus on evaluating the sensitivity of the global distribution of aerosol absorption to key uncertainties in the process representation. For this purpose we extended the comprehensive aerosol-climate model ECHAM5-HAM by effective medium approximations for the calculation of aerosol effective refractive indices, updated black carbon refractive indices, new cloud radiative properties considering the effect of aerosol inclusions, as well as by modules for the calculation of long-wave aerosol radiative properties and instantaneous aerosol forcing. The evaluation of the simulated aerosol absorption optical depth with the AERONET sun-photometer network shows a good agreement in the large scale global patterns. On a regional basis it becomes evident that the update of the BC refractive indices to Bond and Bergstrom (2006) significantly improves the previous underestimation of the aerosol absorption optical depth. In the global annual-mean, absorption acts to reduce the shortwave anthropogenic aerosol top-of-atmosphere (TOA) radiative forcing clear-sky from -0.79 to -0.53Wm(-2) (33%) and all-sky from -0.47 to -0.13 Wm(-2) (72%). Our results confirm that basic assumptions about the BC refractive index play a key role for aerosol absorption and radiative forcing. The effect of the usage of more accurate effective medium approximations is comparably small. We demonstrate that the diversity in the AeroCom land-surface albedo fields contributes to the uncertainty in the simulated anthropogenic aerosol radiative forcings: the usage of an upper versus lower bound of the AeroCom land albedos introduces a global annual-mean TOA forcing range of 0.19W m(-2) (36%) clear-sky and of 0.12 Wm(-2) (92%) all-sky. The consideration of black carbon inclusions on cloud radiative properties results in a small global annual-mean all-sky absorption of 0.05Wm(-2) and a positive TOA forcing perturbation of 0.02 Wm(-2). The long-wave aerosol radiative effects are small for anthropogenic aerosols but become of relevance for the larger natural dust and sea-salt aerosols.

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Language(s): eng - English
 Dates: 2007
 Publication Status: Published in print
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 350934
DOI: 10.5194/acp-7-5237-2007
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Title: Atmospheric Chemistry and Physics
  Alternative Title : Atmos. Chem. Phys
Source Genre: Journal
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Pages: - Volume / Issue: 7 Sequence Number: - Start / End Page: 5237 - 5261 Identifier: -