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<article language="en">
	<journal>
		<journal_title>Atmospheric Chemistry and Physics Discussions</journal_title>
		<journal_url>www.atmos-chem-phys-discuss.net</journal_url>
		<issn>1680-7367</issn>
		<eissn>1680-7375</eissn>
		<volume_number>9</volume_number>
		<issue_number>1</issue_number>
		<publication_year>2009</publication_year>
	</journal>
	<doi>10.5194/acpd-9-3041-2009</doi>
	<article_url>http://www.atmos-chem-phys-discuss.net/9/3041/2009/</article_url>
	<abstract_html>http://www.atmos-chem-phys-discuss.net/9/3041/2009/acpd-9-3041-2009.html</abstract_html>
	<fulltext_pdf>http://www.atmos-chem-phys-discuss.net/9/3041/2009/acpd-9-3041-2009.pdf</fulltext_pdf>
	<start_page>3041</start_page>
	<end_page>3094</end_page>
	<publication_date>2009-01-29</publication_date>
	<article_title content_type="html">Photochemical production of aerosols from real plant emissions</article_title>
	<authors>
		<author numeration="1" affiliations="1">
			<name>Th. F. Mentel</name>
			<email>t.mentel@fz-juelich.de</email>
		</author>
		<author numeration="2" affiliations="2">
			<name>J. Wildt</name>
		</author>
		<author numeration="3" affiliations="1">
			<name>A. Kiendler-Scharr</name>
		</author>
		<author numeration="4" affiliations="2">
			<name>E. Kleist</name>
		</author>
		<author numeration="5" affiliations="1">
			<name>R. Tillmann</name>
		</author>
		<author numeration="6" affiliations="1">
			<name>M. Dal Maso</name>
		</author>
		<author numeration="7" affiliations="1">
			<name>R. Fisseha</name>
		</author>
		<author numeration="8" affiliations="1">
			<name>Th. Hohaus</name>
		</author>
		<author numeration="9" affiliations="1">
			<name>H. Spahn</name>
		</author>
		<author numeration="10" affiliations="2">
			<name>R. Uerlings</name>
		</author>
		<author numeration="11" affiliations="1">
			<name>R. Wegener</name>
		</author>
		<author numeration="12" affiliations="3">
			<name>P. T. Griffiths</name>
		</author>
		<author numeration="13" affiliations="4">
			<name>E. Dinar</name>
		</author>
		<author numeration="14" affiliations="4">
			<name>Y. Rudich</name>
		</author>
		<author numeration="15" affiliations="1">
			<name>A. Wahner</name>
		</author>
	</authors>
	<affiliations>
		<affiliation numeration="1" content_type="html">Institute for Chemistry and Dynamics of the Geosphere, Institute 2: Troposphere, Research Centre Jülich, 52425 Jülich, Germany</affiliation>
		<affiliation numeration="2" content_type="html">Institute for Chemistry and Dynamics of the Geosphere, Institute 3: Phytosphere, Research Centre Jülich, 52425 Jülich, Germany</affiliation>
		<affiliation numeration="3" content_type="html">Centre for Atmospheric Science, Department of Chemistry, Lensfield Road, University of Cambridge, Cambridge, CB2 1EW, UK</affiliation>
		<affiliation numeration="4" content_type="html">Department of Environmental Sciences, Weizmann Institute, Rehovot 76100, Israel</affiliation>
	</affiliations>
	<abstract content_type="html">By emission of volatile organic compounds (VOC) which on oxidation form
secondary organic aerosols (SOA) the vegetation is coupled to atmosphere and
climate. New particle formation from tree emissions was investigated in a
new setup: a plant chamber coupled to a reaction chamber for oxidizing the
plant emissions and for forming SOA. The boreal tree species birch, pine,
and spruce were studied and α-pinene was used as reference compound.
Under the experimental conditions OH radicals were essential for inducing
new particle formation, although O&lt;sub&gt;3&lt;/sub&gt; (&amp;le;80 ppb) was always present
and a part of the monoterpenes and the sesquiterpenes reacted already with
ozone before OH was generated. Formation rates of 3 nm particles were
linearly related to the carbon mixing ratios of the VOC, as were the maximum
observed volume and the condensational growth rates. The threshold of new
particle formation was lower for the tree emissions than for α-pinene.
It was lowest for birch with the largest fraction of oxygenated
VOC (OVOC) suggesting that OVOC may play a pivotal role in new particle
formation. Incremental mass yields were &amp;asymp;5% for pine, spruce and
α-pinene, and &amp;asymp;10% for birch. α-Pinene was a
good model compound to describe the yield and the growth of SOA particles
from coniferous emissions. The mass fractional yields agreed well with
observations for boreal forests. Despite our somewhat enhanced VOC and OH
concentrations our results may thus be up-scaled to eco-system level. Using
the mass fractional yields observed for the tree emissions and weighting
them with the abundance of the respective trees in boreal forests we
calculate SOA mass concentrations which agree within 6% with field
observations. For a future VOC increase of 50% we predict a particle mass
increase due to SOA of 19% assuming today&apos;s mass contribution of
pre-existing aerosol.</abstract>
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