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| Titel |
Day-time concentrations of biogenic volatile organic compounds in a boreal forest canopy and their relation to environmental and biological factors |
| VerfasserIn |
H. K. Lappalainen, S. Sevanto, J. Bäck, T. M. Ruuskanen, P. Kolari, R. Taipale, J. Rinne, M. Kulmala  , P. Hari |
| 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. 15 ; Nr. 9, no. 15 (2009-08-03), S.5447-5459 |
| Datensatznummer |
250007552
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| Publikation (Nr.) |
 copernicus.org/acp-9-5447-2009.pdf |
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| Zusammenfassung |
| Atmospheric concentrations of methanol, acetaldehyde, acetone, isoprene and
monoterpenes were measured using PTR-MS (proton transfer reaction mass
spectrometry) in a boreal forest site in Hyytiälä, Finland (61°51' N,
24°17' E). The concentration measurements were made in the upper canopy of
a Scots pine forest during 6 June, 2006–31 August, 2007. Meteorological
variables such as temperature and photosynthetically active radiation were
measured simultaneously. We also detected biologically sensitive turnover
points such as the onsets of photosynthetic activity, onset of growing
season, bud burst and stem growth during the annual cycle and compared them
to changes in BVOC (biogenic volatile organic compound) concentrations. A
typical seasonal pattern of winter minimum and summer maximum was found for
all studied compounds except acetaldehyde. Spring time methanol and acetone
concentrations increased together with photosynthetic capacity. The day-time
daily median BVOC concentrations correlated best with air temperature. The
intercorrelations between compounds and the analysis of meteorological
conditions indicated that the measured concentrations presented well the
local source. During an exceptional summer drought period the concentrations
were neither connected with photosynthesis nor transpiration, but they were
regulated by some other, yet unknown factors. |
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