References

ACPD

Atmospheric Chemistry and Physics Discussions

ACPD

1680-7375

Copernicus GmbH

Göttingen, Germany

10.5194/acpd-10-22469-2010

Aerosol flux measurements above a mixed forest at Borden, Ontario

Gordon

¹ Staebler

R. M.

¹ Liggio

¹ Vlasenko

¹ Li

S.-M.

¹ Hayden

Science and Technology Branch, Environment Canada, Toronto, Canada

01 10 2010

10 10 22469 22513

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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. 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 for 3 to 410 nm at a rate of 1 Hz. For the size range 20<D<410 nm, 60% of fluxes were upward. The exchange velocity is between −0.5 and 2.0 mm s−1, with median values near 0.5 mm s−1 for all sizes between 24 and 280 nm. The net production rate of particles is highest for 75 nm particles and is near 0.4×106 m−2 s−1. 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. Chemically speciated flux measurements from a previous study at the same location using a Quadrupole Aerosol Mass Spectrometer (Q-AMS) demonstrate a tendency towards downward fluxes, which may be due to an organic particle component which can not be resolved by the flux mode of the Q-AMS.

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