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| Titel |
A new parametrization for ambient particle formation over coniferous forests and its potential implications for the future |
| VerfasserIn |
B. Bonn, M. Boy, M. Kulmala  , A. Groth, K. Trawny, S. Borchert, S. Jacobi |
| 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 ; 9, no. 20 ; Nr. 9, no. 20 (2009-10-27), S.8079-8090 |
| Datensatznummer |
250007711
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| Publikation (Nr.) |
 copernicus.org/acp-9-8079-2009.pdf |
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| Zusammenfassung |
| Atmospheric new particle formation is a general phenomenon observed over
coniferous forests. So far nucleation is either parameterised as a function
of gaseous sulphuric acid concentration only, which is unable to explain the
observed seasonality of nucleation events at different measurement sites, or
as a function of sulphuric acid and organic molecules. Here we introduce
different nucleation parameters based on the interaction of sulphuric acid
and terpene oxidation products and elucidate the individual importance. They
include basic trace gas and meteorological measurements such as ozone and
water vapour concentrations, temperature (for terpene emission) and UV B
radiation as a proxy for OH radical formation. We apply these new parameters
to field studies conducted at conducted at Finnish and German measurement
sites and compare these to nucleation observations on a daily and annual
scale. General agreement was found, although the specific compounds
responsible for the nucleation process remain speculative. This can be
interpreted as follows: During cooler seasons the emission of biogenic
terpenes and the OH availability limits the new particle formation while
towards warmer seasons the ratio of ozone and water vapour concentration
seems to dominate the general behaviour. Therefore, organics seem to support
ambient nucleation besides sulphuric acid or an OH-related compound. Using
these nucleation parameters to extrapolate the current conditions to
prognosed future concentrations of ozone, water vapour and organic
concentrations leads to a significant potential increase in the nucleation
event number. |
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