Atmospheric Chemistry and Physics Discussions
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2007
10.5194/acpd-7-2357-2007
http://www.atmos-chem-phys-discuss.net/7/2357/2007/
http://www.atmos-chem-phys-discuss.net/7/2357/2007/acpd-7-2357-2007.html
http://www.atmos-chem-phys-discuss.net/7/2357/2007/acpd-7-2357-2007.pdf
2357
2388
2007-02-21
Hydrocarbon fluxes above a Scots pine forest canopy: Measurements and modeling
J. Rinne
janne.rinne@helsinki.fi
R. Taipale
T. Markkanen
T. M. Ruuskanen
H. Hellén
M. K. Kajos
T. Vesala
M. Kulmala
Department of Physical Sciences, PL 68, FI-00014 University of Helsinki, Helsinki, Finland
Department of Micrometeorology, Bayreuth University, Bayreuth, Germany
Finnish Meteorological Institute, PL 503, FI-00101 Helsinki, Finland
We measured the fluxes of several hydrocarbon species
above a Scots pine (<it>Pinus sylvestris</it>) stand using disjunct eddy covariance technique with
proton transfer reaction – mass spectrometry. The measurements were
conducted during four days in July at SMEAR II research station in
Hyytiälä, Finland. Compounds which showed significant emission
fluxes were methanol, acetaldehyde, acetone, and monoterpenes. A stochastic
Lagrangian transport model with simple chemical degradation was applied to
assess the sensitivity of the above canopy fluxes to chemistry. According to
the model, the chemical degradation had a minor effect on the fluxes
measured in this study but has a major effect on the vertical flux profiles
of more reactive compounds, such as sesquiterpenes. The monoterpene fluxes
followed the traditional exponential temperature dependent emission
algorithm but were considerably higher than the fluxes measured before at
the same site. The normalized emission potential (30°C) was 2.5 μg
g<sub>dw</sub><sup>–1</sup> h<sup>−1</sup> obtained using the temperature dependence coefficient of 0.09°C<sup>−1</sup>.
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