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Kleefeld, C,O'Dowd, CD,O'Reilly, S,Jennings, SG,Aalto, P,Becker, E,Kunz, G,de Leeuw, G
2002
September
Journal Of Geophysical Research-Atmospheres
Relative contribution of submicron and supermicron particles to aerosol light scattering in the marine boundary layer
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light scattering sea-salt aerosol marine boundary layer particle size distribution Mie theory CHARACTERIZATION EXPERIMENT ACE-1 SEA-SALT AEROSOL OPTICAL-PROPERTIES RADIATIVE PROPERTIES NORTHEAST ATLANTIC NEPHELOMETER BACKSCATTER TASMANIA PACIFIC SULFATE
107
[1] Measurements of the aerosol light scattering coefficient (sigma(sp)) at a wavelength of lambda = 550 nm were conducted at a coastal atmospheric research station in the east Atlantic Ocean during June 1999. Size distribution measurements between diameters of 3 nm and 40 mum (at ambient humidity) were used to derive scattering coefficients from Mie theory. The calculated scattering coefficients were about a factor of 7.4 higher than the measured scattering coefficients. The discrepancy was explained by a reduced cutoff of the sampling system at particle diameters between 6 and 8 mum, dependent on wind speed. The calculated aerosol scattering was about 1 order of magnitude higher than previously reported measurements in the MBL and is attributed to supermicrometer particles at sizes d > 10 mum dominating aerosol scattering.
ARTN 8103
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