Simultaneous spectroradiometry: A study of solar UV irradiance at two altitudes

Details Simultaneous spectroradiometry: A study of solar UV irradiance at two altitudes Simultaneous spectroradiometry: A study of solar UV irradiance at two altitudes

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.2805b&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 25, p. 2805-2808

Physics

19

Altitude, Atmospheric Effects, Emission Spectra, Irradiance, Solar Radiation, Spectral Signatures, Ultraviolet Radiation, Atmospheric Models, Cloud Cover, Radiation Measurement, Spectral Energy Distribution, Spectroradiometers

Scientific paper

Spectrally resolved measurements of solar ultraviolet (UV) radiation were made at adjacent maountain top and valley sites, vertically separated by 1 km. Data was collected over a period of 4 days in August 1993 providing simultaneously measured spectra for a range of zenith angles with both sites in direct sunlight and less than 2 octas of cloud cover. As there was no snow cover the local albedo was similar at both sites. Irradiances at the mountain site were 9% higher than the valley at 370 nm, increasing gradually to 11% at 320 nm. Across the UVB waveband the altitude effect increased dramatically to 24% at 300 nm. The magnitude of the altitude effect was independent of zenith angle, within the measurement accuracy, for the range z = 30 deg - 70 deg. These measured differences between the mountain and valley station can be interpreted by model calculations using the corresponding differences in air pressure, column ozone and aerosol content.

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