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| Titel |
Aerosol flux measurements above a mixed forest at Borden, Ontario |
| VerfasserIn |
M. Gordon, R. M. Staebler, J. Liggio, A. Vlasenko, S.-M. Li, K. Hayden |
| 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 ; 11, no. 14 ; Nr. 11, no. 14 (2011-07-18), S.6773-6786 |
| Datensatznummer |
250009915
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| Publikation (Nr.) |
 copernicus.org/acp-11-6773-2011.pdf |
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| Zusammenfassung |
| Aerosol fluxes were measured above a mixed forest by Eddy Covariance (EC)
with a Fast Mobility Particle Sizer (FMPS) at the Borden Forest Research
Station in Ontario, Canada between 13 July and 12 August 2009. Chemically
speciated flux measurements were made at a height of 29 m at the same
location between 19 July and 2 August, 2006 using a Quadrupole Aerosol Mass
Spectrometer (Q-AMS). The Q-AMS measured an average sulphate deposition
velocity of 0.3 mm s−1 and an average nitrate deposition velocity of
4.8 mm s−1. The FMPS, mounted at a height of 33 m (approximately 10 m
above the canopy top) and housed in a temperature controlled enclosure,
measured size-resolved particle concentrations from 3 to 410 nm diameter at
a rate of 1 Hz. For the size range 18 < D < 452 nm, 60 % of fluxes were
upward. The exchange velocity was between −0.5 and 2.0 mm s−1, with
median values near 0.5 mm s−1 for all sizes between 22 and 310 nm. The
size distribution of the apparent production rate of particles at 33 m
peaked at a diameter of 75 nm. Results indicate a decoupling of the above
and below canopy spaces, whereby particles are stored in the canopy space at
night, and are then diluted with cleaner air above during the day. |
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