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Comparison of Model Calculations with Spectral UV Measurements during the SUSPEN Campaign: The Effect of Aerosols

A. KazantzidisAristotle University of Thessaloniki, Laboratory of Atmospheric Physics, Thessaloniki, Greece

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D. S. BalisAristotle University of Thessaloniki, Laboratory of Atmospheric Physics, Thessaloniki, Greece

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A. F. BaisAristotle University of Thessaloniki, Laboratory of Atmospheric Physics, Thessaloniki, Greece

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S. KazadzisAristotle University of Thessaloniki, Laboratory of Atmospheric Physics, Thessaloniki, Greece

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E. GalaniAristotle University of Thessaloniki, Laboratory of Atmospheric Physics, Thessaloniki, Greece

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E. KosmidisAristotle University of Thessaloniki, Laboratory of Atmospheric Physics, Thessaloniki, Greece

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M. BlumthalerUniversity of Innsbruck, Institute of Medical Physics, Innsbruck, Austria

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Abstract

Spectral measurements of global solar irradiance, obtained under cloud-free conditions during the SUSPEN campaign (July 1997) in Thessaloniki, Greece, are compared with radiative transfer model calculations, showing an agreement to within ±5% for wavelengths higher that 305 nm. The uncertainties in the modeled spectra were analyzed with respect to the aerosol-related model input parameters (single-scattering albedo and asymmetry factor), which were not derivable from measurements. A range of single-scattering albedo values was used to investigate its impact on surface UV irradiance through comparison of measurements with model calculations. It was found that a difference in the single-scattering albedo of 0.1 changes the model–measurement ratio by 7%–14%, depending on solar zenith angle. Finally, an attempt was made to relate the estimated values of single-scattering albedo to wind direction and relative humidity, which control the origin and type of the aerosols in the area.

Corresponding author address: A. Kazantzidis, Aristotle University of Thessaloniki, Campus Box 149, 54006 Thessaloniki, Greece.

Email: akaza@auth.gr

Abstract

Spectral measurements of global solar irradiance, obtained under cloud-free conditions during the SUSPEN campaign (July 1997) in Thessaloniki, Greece, are compared with radiative transfer model calculations, showing an agreement to within ±5% for wavelengths higher that 305 nm. The uncertainties in the modeled spectra were analyzed with respect to the aerosol-related model input parameters (single-scattering albedo and asymmetry factor), which were not derivable from measurements. A range of single-scattering albedo values was used to investigate its impact on surface UV irradiance through comparison of measurements with model calculations. It was found that a difference in the single-scattering albedo of 0.1 changes the model–measurement ratio by 7%–14%, depending on solar zenith angle. Finally, an attempt was made to relate the estimated values of single-scattering albedo to wind direction and relative humidity, which control the origin and type of the aerosols in the area.

Corresponding author address: A. Kazantzidis, Aristotle University of Thessaloniki, Campus Box 149, 54006 Thessaloniki, Greece.

Email: akaza@auth.gr

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