References

ACPD

Atmospheric Chemistry and Physics Discussions

ACPD

1680-7375

Copernicus GmbH

Göttingen, Germany

10.5194/acpd-8-10531-2008

Measurements of size-resolved hygroscopicity in the California coastal zone

Hegg

D. A.

¹ Covert

D. S.

¹ Jonsson

H. H.

Department of Atmospheric Sciences, University of Washington, Seattle, WA, USA

Meteorology Department, Naval Post Graduate School, Monterey, CA, USA

03 06 2008

8 3 10531 10560

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Aircraft – based measurements of aerosol hygroscopicity, both in the form of size-resolved, diameter growth factors and in the dependence of particle light scattering on relative humidity, are presented for the marine boundary layer of the southern California coastal zone. The chemical composition of the aerosol is collated with the hygroscopicity data, both to examine the nature of aerosol aging and as input for receptor type modeling. The data suggest an increase in aerosol hygroscopicity with altitude, possibly associated with oxidation of organic films. The receptor modeling suggests three distinct aerosol types/sources for this venue: marine, biomass burning and pollution. Model output is used in regression analyses to derive a prognostic mixing rule for the hygroscopicity of aerosol with these three sources.

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