MEASURED ALTITUDINAL PROFILES OF UV-B IRRADIANCE IN HAWAI'I |
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| Authors: | Dennis Nullet James O Juvik |
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| Institution: | Department of Geography , University of Hawai'i at Hilo , Hilo, Hawai'i, 96720 |
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| Abstract: | Erythemally weighted UV-B irradiance was measured between sea level and 4,205 m in several midday altitudinal transects and continuously for several months at sea level and 3,400 m on the Island of Hawai'i. Between sea level and 4,205 m, standardized UV-B increased 25% and 29% for solar zenith angles of 10° and 45°, respectively, under clear-sky conditions. The standardized diffuse component constituted 28% to 58% of the total as a function of optical path length. Under all sky conditions, the monthly average UV-B irradiance increased 50% in summer and 103% in winter from a cloudy, windward, sea-level location to a site at 3,400 m in generally clear skies above the trade-wind inversion. Key words: solar radiation, ultraviolet-B irradiance, Hawai'i.] |
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| Keywords: | snow cover wildfire western United States |
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