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| Titel |
BVOC-aerosol-climate interactions in the global aerosol-climate model ECHAM5.5-HAM2 |
| VerfasserIn |
R. Makkonen, A. Asmi, V.-M. Kerminen, M. Boy, A. Arneth, A. Guenther, M. Kulmala  |
| 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 ; 12, no. 21 ; Nr. 12, no. 21 (2012-11-02), S.10077-10096 |
| Datensatznummer |
250011554
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| Publikation (Nr.) |
 copernicus.org/acp-12-10077-2012.pdf |
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| Zusammenfassung |
| The biosphere emits volatile organic compounds (BVOCs) which, after oxidation
in the atmosphere, can partition on the existing aerosol population or even
form new particles. The large quantities emitted provide means for a large
potential impact on both aerosol direct and indirect effects. Biogenic
responses to atmospheric temperature change can establish feedbacks even in
rather short timescales. However, due to the complexity of organic aerosol
partitioning, even the sign of these feedbacks is of large uncertainty. We
use the global aerosol-climate model ECHAM5.5-HAM2 to explore the effect of
BVOC emissions on new particle formation, clouds and climate. Two BVOC
emission models, MEGAN2 and LPJ-GUESS, are used. MEGAN2 shows a 25%
increase while LPJ-GUESS shows a slight decrease in global BVOC emission
between years 2000 and 2100. The change of shortwave cloud forcing from year
1750 to 2000 ranges from −1.4 to −1.8 W m−2 with 5 different
nucleation mechanisms. We show that the change in shortwave cloud forcing
from the year 2000 to 2100 ranges from 1.0 to 1.5 W m−2. Although
increasing future BVOC emissions provide 3–5% additional CCN, the effect
on the cloud albedo change is modest. Due to simulated decreases in future
cloud cover, the increased CCN concentrations from BVOCs can not provide
significant additional cooling in the future. |
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