TY  - JOUR
A1  - Bonn, Boris
A1  - Boy, Michael
A1  - Kulmala, Markku
A1  - Groth, Angela
A1  - Trawny, Katrin
A1  - Borchert, Sebastian
A1  - Jacobi, Stefan
T1  - A new parametrization for ambient particle formation over coniferous forests and its potential implications for the future
T2  - Atmospheric chemistry and physics
N2  - 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.
Y1  - 2009
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/7840
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30-77998
SN  - 1680-7316
SN  - 1680-7324
N1  - © Author(s) 2009. This work is distributed under the Creative Commons Attribution 3.0 License.
VL  - 9
SP  - 8079
EP  - 8090
PB  - European Geosciences Union
CY  - Katlenburg-Lindau
ER  -