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| Titel |
Modelled black carbon radiative forcing and atmospheric lifetime in AeroCom Phase II constrained by aircraft observations |
| VerfasserIn |
B. H. Samset, G. Myhre, A. Herber, Y. Kondo, S.-M. Li, N. Moteki, M. Koike, N. Oshima, J. P. Schwarz, Y. Balkanski, S. E. Bauer, N. Bellouin, T. K. Berntsen, H. Bian, M. Chin, T. Diehl, R. C. Easter, S. J. Ghan, T. Iversen, A. Kirkevåg, J.-F. Lamarque, G. Lin, X. Liu, J. E. Penner, M. Schulz, Ø. Seland, R. B. Skeie, P. Stier, T. Takemura, K. Tsigaridis, K. Zhang |
| 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 ; 14, no. 22 ; Nr. 14, no. 22 (2014-11-27), S.12465-12477 |
| Datensatznummer |
250119191
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| Publikation (Nr.) |
 copernicus.org/acp-14-12465-2014.pdf |
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| Zusammenfassung |
| Atmospheric black carbon (BC) absorbs solar radiation, and exacerbates
global warming through exerting positive radiative forcing (RF). However,
the contribution of BC to ongoing changes in global climate is under debate.
Anthropogenic BC emissions, and the resulting distribution of BC
concentration, are highly uncertain. In particular, long-range transport and
processes affecting BC atmospheric lifetime are poorly understood. Here we
discuss whether recent assessments may have overestimated present-day BC
radiative forcing in remote regions. We compare vertical profiles of BC
concentration from four recent aircraft measurement campaigns to simulations
by 13 aerosol models participating in the AeroCom Phase II intercomparison.
An atmospheric lifetime of BC of less than 5 days is shown to be essential
for reproducing observations in remote ocean regions, in line with other
recent studies. Adjusting model results to measurements in remote regions,
and at high altitudes, leads to a 25% reduction in AeroCom Phase II
median direct BC forcing, from fossil fuel and biofuel burning, over the
industrial era. The sensitivity of modelled forcing to BC vertical profile
and lifetime highlights an urgent need for further flight campaigns, close
to sources and in remote regions, to provide improved quantification of BC
effects for use in climate policy. |
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