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| Titel |
Air-sea fluxes of methanol, acetone, acetaldehyde, isoprene and DMS from a Norwegian fjord following a phytoplankton bloom in a mesocosm experiment |
| VerfasserIn |
V. Sinha, J. Williams, M. Meyerhöfer, U. Riebesell, A. I. Paulino, A. Larsen |
| 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 ; 7, no. 3 ; Nr. 7, no. 3 (2007-02-14), S.739-755 |
| Datensatznummer |
250004562
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| Publikation (Nr.) |
 copernicus.org/acp-7-739-2007.pdf |
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| Zusammenfassung |
| The ocean's influence on volatile organic compounds (VOCs) in the atmosphere
is poorly understood. This work characterises the oceanic emission and/or
uptake of methanol, acetone, acetaldehyde, isoprene and dimethyl sulphide
(DMS) as a function of photosynthetically active radiation (PAR) and a suite
of biological parameters. The measurements were taken following a
phytoplankton bloom, in May/June 2005 with a proton transfer reaction mass
spectrometer (PTR-MS), from mesocosm enclosures anchored in the Raunefjord,
Southern Norway. The net flux of methanol was always into the ocean, and was
stronger at night. Isoprene and acetaldehyde were emitted from the ocean,
correlating with light (ravcorr, isoprene=0.49; ravcorr,
acetaldehyde=0.70) and phytoplankton abundance. DMS was also emitted to
the air but did not correlate significantly with light (ravcorr, dms=0.01).
Under conditions of high biological activity and a PAR of ~450 μmol photons
m−2 s−1, acetone was emitted from the ocean,
otherwise it was uptaken. The inter-VOC correlations were highest between
the day time emission fluxes of acetone and acetaldehyde (rav=0.96),
acetaldehyde and isoprene (rav=0.88) and acetone and isoprene
(rav=0.85). The mean fluxes for methanol, acetone, acetaldehyde,
isoprene and DMS were −0.26 ng m−2 s−1,
0.21 ng m−2 s−1,
0.23 ng m−2 s−1, 0.12 ng m−2 s−1
and 0.3 ng m−2 s−1,
respectively. This work shows that compound specific PAR
and biological dependency should be used for estimating the influence of the
global ocean on atmospheric VOC budgets. |
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