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A Visible and Near-Infrared Scanning Photometer for Field Measurements of Spectral Albedo and Irradiance under Polar Conditions *

  • T. C. Grenfell (a1)

Abstract

The design and operating characteristics are presented for a visible and near-infrared scanning photometer which can measure incident and reflected spectral irradiance from 400 nm to 2 450 nm. The instrument is designed to record over 98% of the solar radiation incident upon and reflected from the Earth’s surface using a turret-type cosine collector and a circular variable interference filter. The apparatus has been tested successfully on Arctic sea ice at temperatures down to –20°C. It is self-contained and easily portable, and its mass is less than 16 kg. Some preliminary results are presented.

Résumé

On présente les plans et les caractéristiques opératoires d’un photomètre infrarouge à balayage qui peut mesurer la radiation spectrale incidente et réfléchie de 400 nm à 2 450 nm. L’instrument est conçu pour enregistrer plus de 98% de la radiation solaire incidente et réfléchie par la surface de la terre en utilisant un collecteur angulaire du type tourelle et un filtre à interférence variable circulaire. L’appareil a été essayé avec succès sur la glace de mer Arctique à des températures inférieures à –20°C. II possède son propre emballage et est facilement portable, son poids est inférieur à 16 kg. Quelques premiers résultats sont présentés.

Zusammenfassung

Es werden die Konstruktion und die Messcharakteristiken eines Abtastphotometers dargelegt, las einfallende und reflektierte Strahlung zwischen 400 nm und 2 450 nm messen kann. Das Instrument vermag über 98% der auf die Erdoberfläche einfallenden und von ihr reflektierten Sonnenstrahlung festzustellen; es benutzt einen Cosinuskollektor vom Turret-Typ und ein zirkulär veränderliches Interferenzfilter. Der Apparat wurde auf arktischem Meereis bei Temperaturen bis zu –20°C erfolgreich erprobt; er ist selbständig im Betrieb und bei einer Masse von weniger als 16 kg bequem tragbar. Einige vorläufige Ergebnisse werden vorgelegt.

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      A Visible and Near-Infrared Scanning Photometer for Field Measurements of Spectral Albedo and Irradiance under Polar Conditions *
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Copyright

Footnotes

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page note page 475 note *

Contribution No. 582 of the Department of Atmospheric Sciences, University of Washington.

Footnotes

References

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Dirmhirn, I. 1961. Ergebnisse von albedo Untersuchungen im Sonnblickgebiet. Wetter und Leben, Sonderheft 9, p. 11519.
Grenfell, T. C., and Maykut, G. A. 1977. The optical properties of ice and snow in the Arctic basin. Journal of Glaciology, Vol. 18, No. 80, p. 44563.
Herman, G. F. 1977. Solar radiation in summertime Arctic stratus clouds. Journal of the Atmospheric Sciences, Vol. 34, No. 9, p. 142332.
Kuhn, M., and Siogas, L. 1978. Spectroscopic studies at McMurdo, South Pole, and Siple stations during the austral summer, 1977–78. Antarctic Journal of the United Stales, Vol. 13, No. 4, p. 17879.
O′Brien, H. W., and Munis, R. H. 1975. Red and infrared spectral reflectances of snow. U.S. Cold Regions Research and Engineering Laboratory. Research Report 332.
Weaver, D. 1970. Radiation regime over Arctic tundra and lake, 1966. [Seattle], Dept. of Atmospheric Sciences, University of Washington. (U.S. Office of Naval Research. Contract Nooo14–67–0103–0007. Project No. 307–252, Scientific Report No. 6.)

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