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| Titel |
Contribution from biogenic organic compounds to particle growth during the 2010 BEACHON-ROCS campaign in a Colorado temperate needleleaf forest |
| VerfasserIn |
L. Zhou, R. Gierens, A. Sogachev, D. Mogensen, J. Ortega, J. N. Smith, P. C. Harley, A. J. Prenni, E. J. T. Levin, A. Turnipseed, A. Rusanen, S. Smolander, A. B. Guenther, M. Kulmala  , T. Karl, M. Boy |
| 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. 15 ; Nr. 15, no. 15 (2015-08-06), S.8643-8656 |
| Datensatznummer |
250119947
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| Publikation (Nr.) |
 copernicus.org/acp-15-8643-2015.pdf |
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| Zusammenfassung |
| New particle formation (NPF) is an important atmospheric phenomenon. During
an NPF event, particles first form by nucleation and then grow further in
size. The growth step is crucial because it controls the number of particles
that can become cloud condensation nuclei. Among various physical and
chemical processes contributing to particle growth, condensation by organic
vapors has been suggested as important. In order to better understand the
influence of biogenic emissions on particle growth, we carried out modeling
studies of NPF events during the BEACHON-ROCS (Bio–hydro–atmosphere interactions of Energy, Aerosol,
Carbon, H2O, Organics & Nitrogen – Rocky Mountain Organic Carbon Study) campaign at Manitou
Experimental Forest Observatory in Colorado, USA. The site is representative
of the semi-arid western USA. With the latest Criegee intermediate reaction
rates implemented in the chemistry scheme, the model underestimates sulfuric
acid concentration by 50 %, suggesting either missing sources of
atmospheric sulfuric acid or an overestimated sink term. The results
emphasize the contribution from biogenic volatile organic compound emissions
to particle growth by demonstrating the effects of the oxidation products of
monoterpenes and 2-Methyl-3-buten-2-ol (MBO). Monoterpene oxidation products
are shown to influence the nighttime particle loadings significantly, while
their concentrations are insufficient to grow the particles during the day.
The growth of ultrafine particles in the daytime appears to be closely related to
the OH oxidation products of MBO. |
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