한국농림기상학회지, 제 5권 제2호(2003) (pISSN 1229-5671, eISSN 2288-1859)
Korean Journal of Agricultural and Forest Meteorology, Vol. 5, No. 2, (2003), pp. 128~137
ⓒ Author(s) 2014. CC Attribution 3.0 License.


순복사계의 야외 상호 비교 및 보정

문병관(1), 류상범(2), 윤용훈(3), 임종환(4), 김준(1)
(1)연세대학교 지구환경연구소 대기과학과
(2)기상연구소 기후연구실
(3)기상연구소 해양기상지진연구실
(4)임업연구원 산림생태과

Field Intercomparison and Calibration of Net Radiometers

Byung-Kwan Moon(1), Sang-Boom Ryoo(2), Yong-Hoon Youn(3), Jonghwan Lim(4), Joon Kim(1)
(1)Global Environment Laboratory/Department of Atmospheric Sciences, Yonsei University, Seoul 120-749, Korea
(2)Climate Research Laboratory, Korean Meteorological Research Institute, Seoul 156-720, Korea
(3)Marine Meteorology and Earthquake Research Laboratory, Korean Meteorological Research Institute,
Seoul 156-720, Korea
(4)Division of Forest Ecology, Korea Forest Research Institute, Seoul 130-712, Korea

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 interva

Keyword: net radiation, field calibration, intercomparison, net radiometer

MAIN

적요

순복사는 지표 에너지 수지의 가장 근본적인 요소 중 하나이다. 순복사의 정확한 관측을 위해, 주기적이고 지속적인 순복사계 보정이 요구된다. 플럭스 관측에 널리 사용되는, 두 가지 타입의 대표적인 순복사계 (Q-7.1과 CNR1)의 상호 비교 및 보정 실험이 약 4개월 간격으로 두 차례 시행되었다. Q-7.1과 CNR1 간의 차이는 7.7% 이내였고, 표준 기기와의 보정 후 오차는 3.2%이내였다. 순복사계의 반응 차이와 보정 계수는 대기 상태, 특히 계절 변화에 따른 온도 차이에 따라 다르게 나타났다. 결론적으로, 주기적으로 보정된 Q-7.1은 CNR1을 대체하여 장기 관측에 사용될 수 있고, 보정 주기로는 4-6개월이 권장된다.

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