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Monoterpene pollution episodes in a forest environment: indication of anthropogenic origin and association with aerosol particles.

Authors :
Li Lia
Maso, Miikka Dal
Taipale, Risto
Rinne, Janne
Ehn, Mikae
Junninen, Heikki
Äijälä, Mikko
Nieminen, Tuomo
Alekseychik, Pavel
Hulkkonen, Mira
Worsnop, Douglas R.
Kerminen, Veli-Matti
Kulmala, Markku
Source :
Boreal Environment Research; 2011, Vol. 16 Issue 4, p288-303, 16p
Publication Year :
2011

Abstract

We used a monoterpene volume mixing ratio dataset measured from 12 June 2006 to 24 September 2007 and from 1 June 2008 to 3 March 2009 at the SMEAR II station to quantify the magnitude of anthropogenic monoterpene emissions aside from biogenic origins, to examine the anthropogenic sources, and to look at other associated pollutants. We discuss the relations between increased monoterpene mixing ratios and particle concentrations. We also characterize chemical properties of aerosol particles during two monoterpene pollution episodes in case studies. Out of 580 days analyzed, anthropogenic monoterpene pollution episodes were found on 341 (58.8%) days. The average monoterpene mixing ratio increased from 0.19 to 0.26 ppbv due to the presence of anthropogenic monoterpenes, which is equal to an increase of 36.8%. The observed anthropogenic monoterpenes were mostly from the Korkeakoski sawmill. Other gas pollutants might occasionally be emitted during the episodes, but did not show clear association with anthropogenic monoterpenes. Aerosol particle concentrations substantially increased during episodes, and monoterpene mixing ratios showed strong connections with Aitken mode particles both in number and volume concentrations. Particles associated with monoterpene episodes reached a CCN (cloud concentration nucleus) size. The chemical characterizations of aerosol particles in case studies show that the increase in aerosol particle mass was mainly from secondary organic aerosol. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
12396095
Volume :
16
Issue :
4
Database :
Supplemental Index
Journal :
Boreal Environment Research
Publication Type :
Academic Journal
Accession number :
66935733