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| Titel |
Intercomparison of shortwave radiative transfer schemes in global aerosol modeling: results from the AeroCom Radiative Transfer Experiment |
| VerfasserIn |
C. A. Randles, S. Kinne, G. Myhre, M. Schulz, P. Stier, J. Fischer, L. Doppler, E. Highwood, C. Ryder, B. Harris, J. Huttunen, Y. Ma, R. T. Pinker, B. Mayer, D. Neubauer, R. Hitzenberger, L. Oreopoulos, D. Lee, G. Pitari, G. Genova, J. Quaas, F. G. Rose, S. Kato, S. T. Rumbold, I. Vardavas, N. Hatzianastassiou, C. Matsoukas, H. Yu, F. Zhang, H. Zhang, P. Lu |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 5 ; Nr. 13, no. 5 (2013-03-01), S.2347-2379 |
| Datensatznummer |
250018459
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| Publikation (Nr.) |
 copernicus.org/acp-13-2347-2013.pdf |
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| Zusammenfassung |
| In this study we examine the performance of 31 global model radiative
transfer schemes in cloud-free conditions with prescribed gaseous absorbers
and no aerosols (Rayleigh atmosphere), with prescribed scattering-only
aerosols, and with more absorbing aerosols. Results are compared to benchmark
results from high-resolution, multi-angular line-by-line radiation models.
For purely scattering aerosols, model bias relative to the line-by-line
models in the top-of-the atmosphere aerosol radiative forcing ranges from
roughly −10 to 20%, with over- and underestimates of radiative cooling
at lower and higher solar zenith angle, respectively. Inter-model diversity
(relative standard deviation) increases from ~10 to 15% as solar
zenith angle decreases. Inter-model diversity in atmospheric and surface
forcing decreases with increased aerosol absorption, indicating that the
treatment of multiple-scattering is more variable than aerosol absorption in
the models considered. Aerosol radiative forcing results from multi-stream
models are generally in better agreement with the line-by-line results than
the simpler two-stream schemes. Considering radiative fluxes, model
performance is generally the same or slightly better than results from
previous radiation scheme intercomparisons. However, the inter-model
diversity in aerosol radiative forcing remains large, primarily as a result
of the treatment of multiple-scattering. Results indicate that global models
that estimate aerosol radiative forcing with two-stream radiation schemes may
be subject to persistent biases introduced by these schemes, particularly for
regional aerosol forcing. |
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