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Field Intercomparison and Calibration of Net Radiometers  

Byung-Kwan Moon (Global Environment Laboratory/Department of Atmospheric Sciences, Yonsei University)
Sang-Boom Ryoo (Climate Research Laboratory, Korean Meteorological Research Institute)
Yong-Hoon Youn (Marine Meteorology and Earthquake Research Laboratory, Korean Meteorological Research Institute)
Jonghwan Lim (Division of Forest Ecology, Korea Forest Research Institute)
Joon Kim (Global Environment Laboratory/Department of Atmospheric Sciences, Yonsei University)
Publication Information
Korean Journal of Agricultural and Forest Meteorology / v.5, no.2, 2003 , pp. 128-137 More about this Journal
Abstract
Net radiation (Rn) is one of the most fundamental components in surface energy budget. For an accurate measurement of Rn, periodic and consistent calibrations of net radiometers are required. With a 4-month time interval, two field experiments were conducted to inter-compare and calibrate two types of net radiometers (the Q-7.1 and the CNR1), widely used in flux measurements. Differences between the Q-7.1 and the CNR1 net radiometers were within 7.7%, and the errors after calibration against the standard net radiometer were ＜3.2%. Radiometric responses and calibration factors appeared to have changed with sky renditions, especially temperature difference with season's progress. We concluded that the periodically calibrated Q-7.1 can replace more expensive, more accurate CNR1 net radiometer for long-term field measurements, providing that field calibrations of net radiometers are performed every 4-6 months interval.
Keywords
net radiation; field calibration; intercomparison; net radiometer;
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