Angström turbidity parameters and aerosol optical thickness: A study over 500 solar beam spectra

Details Angström turbidity parameters and aerosol optical thickness: A study over 500 solar beam spectra Angström turbidity parameters and aerosol optical thickness: A study over 500 solar beam spectra

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jgr...10221905b&link_type=abstract

Journal of Geophysical Research, Volume 102, Issue D18, p. 21905-21914

Astronomy and Astrophysics

Astrophysics

6

Atmospheric Composition And Structure: Aerosols And Particles, Atmospheric Composition And Structure: Pollution-Urban And Regional, Solar Physics, Astrophysics, And Astronomy: Solar Irradiance, Information Related To Geographic Region: Europe

Scientific paper

There exists in the literature many methods of determining the Angström parameters for the measurement of the optical thickness of aerosols. This thickness is required in cases such as when the spectral beam solar irradiance at ground level has to be assessed. The present work studies the differences between some of these methods and establishes the relationships between their results. A systematic study investigating 509 direct solar irradiance spectra was undertaken. As a result, a new wavelength pair for filter measurements is proposed to calculate the Angström parameters with the Voltz technic, namely, the pair (0.400 μm, 0.750 μm). This new pair is the one which best describes the solar beam attenuation in the atmospheric transmittance models. For the considered atmospheric conditions (continental urban aerosols), the mean value of the Angström parameter α is found to be 1.0+/-0.3, which is relatively close to the conventional α=1.3 if taking into account the variance. The wavelength range explored is from 0.290 μm to 0.900 μm, which concerns many applications in bioscience.

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