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Atmos. Chem. Phys. Discuss., 10, 4649-4672, 2010
www.atmos-chem-phys-discuss.net/10/4649/2010/ doi:10.5194/acpd-10-4649-2010 © Author(s) 2010. This work is distributed under the Creative Commons Attribution 3.0 License. |
Size-dependent aerosol deposition velocities during BEARPEX'07
1College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, OR, 97331 USA
2Joint Institute for the Study of Atmospheres and Oceans, University of Washington, Seattle, WA, USA
Abstract. Aerosol concentrations and 3-D winds were measured from 9 to 25 September 2007 above a pine forest in California. The measurements were combined using the eddy covariance (EC) technique to determine aerosol eddy fluxes as a function of particle diameter within the accumulation mode size range (0.25 μm< dia <1μm here). Measured heat and water vapor fluxes were utilized to correct the aerosol eddy fluxes for aerosol hygroscopic growth. The hygroscopic growth correction was necessary despite the low RH and relatively hygrophobic nature of the particles. Uncertainties associated with particle counting also were evaluated from the data. Aerosol deposition velocities (Vd = EC turbulent flux/mean particle concentration) during daytime were shown to vary from −0.2 to −1.0 cm s−1; |Vd| increases with friction velocity and particle diameter.
Citation: Vong, R. J., Vong, I. J., Vickers, D., and Covert, D. S.: Size-dependent aerosol deposition velocities during BEARPEX'07, Atmos. Chem. Phys. Discuss., 10, 4649-4672, doi:10.5194/acpd-10-4649-2010, 2010.