Physics
Scientific paper
Jun 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30k..39b&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 11, pp. 39-1, CiteID 1585, DOI 10.1029/2003GL017000
Physics
44
Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801), Atmospheric Composition And Structure: Biosphere/Atmosphere Interactions, Atmospheric Composition And Structure: Chemical Kinetic And Photochemical Properties
Scientific paper
Atmospheric new aerosol particle formation observed in remote areas (e.g., in Finland, Portugal and in the U.S.). is generally attributed to low-volatile oxidation products of monoterpenes (C10H16), which are emitted by the vegetation. In this article we show that this atmospheric new particle formation is not caused by monoterpene products, but most likely initiated by very low-volatile substances produced during sesquiterpene (C15H24)-ozone reactions. For this purpose, the nucleation times of the most abundant monoterpene reactions have been calculated and discussed exemplarily for the Finnish site Hyytiälä, at which nucleation events have been observed. In addition, the important negative influence of water vapor on the nucleation threshold of the β-caryophyllene-ozone reaction has been studied in detail at different dew points in the laboratory. Therein, the saturation vapor pressure of the nucleating compounds was estimated to be less than 1.2 . 10-10 hPa, which is recommended for atmospheric homogeneous nucleation of non-volatile organics.
Bonn Boris
Moortgat Geert K.
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