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| Titel |
Aerosol nucleation spikes in the planetary boundary layer |
| VerfasserIn |
J.-P. Chen, T.-S. Tsai, S.-C. Liu |
| 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 ; 11, no. 14 ; Nr. 11, no. 14 (2011-07-21), S.7171-7184 |
| Datensatznummer |
250009939
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| Publikation (Nr.) |
 copernicus.org/acp-11-7171-2011.pdf |
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| Zusammenfassung |
| Photochemically driven nucleation bursts, which typically occur within a few
hours after sunrise, often produce strong aerosol number concentration (ANC)
fluctuations. The causes of such ANC spikes were investigated using a
detailed aerosol model running in the parcel mode. Two potential mechanisms
for the ANC spikes were proposed and simulated. The blocking of actinic flux
by scattered clouds can significantly influence new particle production, but
this does not cause strong fluctuations in the number of aerosols within
sizes greater than the detection limit of our measurements. A more plausible
mechanism is the turbulence eddy effect. Strong aerosol nucleation may occur
in both updrafts and downdrafts, while the cloud formation at the boundary
layer top strongly reduces the number of aerosols. As the number of aerosols
is sensitive to turbulence eddy and cloud formation properties, a changing
turbulence condition would result in large fluctuations in the evolution of
ANC similar to that observed at the surface. |
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