Retrieval of aerosol properties from boundary layer extinction measurements with a DOAS system

Details Retrieval of aerosol properties from boundary layer extinction measurements with a DOAS system Retrieval of aerosol properties from boundary layer extinction measurements with a DOAS system

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.2019f&link_type=abstract

Geophysical Research Letters, Volume 24, Issue 16, p. 2019-2022

Physics

1

Atmospheric Composition And Structure: Aerosols And Particles, Atmospheric Composition And Structure: Instruments And Techniques

Scientific paper

Boundary layer trace gas and particulate extinction measurements in the wavelength region from 320 nm to 680 nm have been performed by means of a differential optical absorption spectroscopy (DOAS) system at Cape Arkona (Island Rügen/Germany). The wavelength-dependent extinction coefficient σe(λ) is determined from the attenuation of radiation along two paths of different lengths. Nearly simultaneous recording of the concentrations of O3 and NO2 within the same air mass allows a correction of their contribution to σe(λ). The extinction coefficients are compared with volume scattering coefficients measured by an open integrating nephelometer. Differences between the measurements can be attributed to atmospheric inhomogeneities. A simplified model involving monomodal log-normal distributions is applied to approximate the total particle surface area concentration and an upper limit of the accumulation mode radius. This allows a rough estimate of the particle number concentration. During the summer of 1995 the mean (median) surface area concentration was about 350 (250)μm2/cm3, and the particle number concentration ranged from about 100cm-3 to some 1000cm-3.

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