Measuring spectral and spatial variations of UVA and UVB sky radiance | Zendy

Blumthaler M. | Zendy; Gröbner J. | Zendy; Huber M. | Zendy; Ambach W. | Zendy

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Measuring spectral and spatial variations of UVA and UVB sky radiance

Author(s) -

Blumthaler M.,

Gröbner J.,

Huber M.,

Ambach W.

Publication year - 1996

Publication title -

geophysical research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.007

H-Index - 273

eISSN - 1944-8007

pISSN - 0094-8276

DOI - 10.1029/96gl00248

Subject(s) - radiance , sky , zenith , diffuse sky radiation , solar zenith angle , radiative transfer , irradiance , sky brightness , remote sensing , environmental science , wavelength , aerosol , atmospheric radiative transfer codes , physics , atmospheric sciences , optics , scattering , meteorology , geology

Spectral sky radiance measurements have been obtained with a double monochromator using a 1.5° field of view under varying atmospheric conditions at selected sites in Europe. Spatial variations of the intensity of the sky radiance up to a factor of 10 are observed in the UVA, which decrease to a factor of 2 in the UVB. A distinct minimum of the sky radiance is observed, the location depends on the solar zenith angle but not on wavelength. It is located at scattering angles between 90° and 75° for solar zenith angles between 80° and 26°. A comparison between measurements of the sky radiance and radiative transfer calculations with an aerosol free atmosphere shows a strong dependence of UVB sky radiance on aerosol particles in contrast to UVA sky radiance and possibly a dependence on tropospheric ozone as well.

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