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UV - THEODORE ROOSEVELT NATIONAL PARK ND
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Description:
Brewer 131 is located in Theodore Roosevelt NP (South Section), measuring ultraviolet solar radiation. Irradiance and column ozone are derived from this data. Ultraviolet solar radiation is measured with a Brewer Mark IV, single-monochrometer, spectrophotometer manufactured by SCI-TEC Instruments, Inc. of Saskatoon, SK, Canada. The UV monitoring under EPA's UV-Net program is coordinated with measurement programs of other U.S. Federal agencies through the U.S. Global Change Research Program. Brewer 131 is located on the roof of an instrument shelter about 3 meters off the ground. The site is about 400 meters east of the Painted Canyon Visitors Center in the Park's South Unit. The terrain is largely treeless with arid high plains to the south, breaking downward about 50 meters north of the site into rough, eroded topography of the badlands. Terrain does not interfere with a full view of the sky. There is a meteorological tower to the north of the Brewer and a gas sampling tower within 3 meters to the southwest (against the shelter). The latter tower can be expected to interfere with direct sun measurements in the mid-afternoon. The Brewer has been recording data at this site since September 1998.