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| Titel |
Aerosol size distribution and radiative forcing response to anthropogenically driven historical changes in biogenic secondary organic aerosol formation |
| VerfasserIn |
S. D. D'Andrea, J. C. Acosta Navarro, S. C. Farina, C. E. Scott, A. Rap, D. K. Farmer, D. V. Spracklen, I. Riipinen, J. R. Pierce |
| 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 ; 15, no. 5 ; Nr. 15, no. 5 (2015-03-02), S.2247-2268 |
| Datensatznummer |
250119482
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| Publikation (Nr.) |
 copernicus.org/acp-15-2247-2015.pdf |
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| Zusammenfassung |
Emissions of biogenic volatile organic compounds (BVOCs) have changed in the
past millennium due to changes in land use, temperature, and CO2
concentrations. Recent reconstructions of BVOC emissions have predicted that
global isoprene emissions have decreased, while monoterpene and
sesquiterpene emissions have increased; however, all three show regional
variability due to competition between the various influencing factors.
In this work, we use two modeled estimates of BVOC emissions from the years
1000 to 2000 to test the effect of anthropogenic changes to BVOC emissions
on secondary organic aerosol (SOA) formation, global aerosol size distributions, and radiative effects
using the GEOS-Chem-TOMAS (Goddard Earth Observing System; TwO-Moment Aerosol
Sectional) global aerosol microphysics model. With
anthropogenic emissions (e.g., SO2, NOx, primary aerosols) turned
off and BVOC emissions changed from year 1000 to year 2000 values, decreases
in the number concentration of particles of size Dp > 80 nm
(N80) of > 25% in year 2000 relative to year 1000 were
predicted in regions with extensive land-use changes since year 1000 which
led to regional increases in the combined aerosol radiative effect (direct
and indirect) of > 0.5 W m−2 in these regions. We test the
sensitivity of our results to BVOC emissions inventory, SOA yields, and the
presence of anthropogenic emissions; however, the qualitative response of
the model to historic BVOC changes remains the same in all cases. Accounting
for these uncertainties, we estimate millennial changes in BVOC emissions
cause a global mean direct effect of between +0.022 and +0.163 W m−2 and the global mean cloud-albedo aerosol indirect effect of between
−0.008 and −0.056 W m−2. This change in aerosols, and the associated
radiative forcing, could be a largely overlooked and important anthropogenic
aerosol effect on regional climates. |
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