한국농림기상학회지, 제 4권 제2호(2002) (pISSN 1229-5671, eISSN 2288-1859)
Korean Journal of Agricultural and Forest Meteorology, Vol. 4, No. 2, (2002), pp. 103~113
ⓒ Author(s) 2014. CC Attribution 3.0 License.


개회로 CO2/H2O 적외선 기체 분석기 보정 인자의 변동성과
장기 플럭스 관측에 미치는 영향

최태진(1), 윤진일(2), 임종환(3), 박은우(4), 김준(1)
(1)연세대학교 대기과학과 & 지구환경연구소
(2)경희대학교 생태시스템 공학과, (3)임업연구원 산림생태과
(4)서울대학교 농업과학공동기기센터

(2002년 04월 15일 접수; 2002년 06월 04일 수락)

Variability of Calibration Factors for Open-Path CO2/H2O Infrared
Gas Analyzer and Its Effect on Long-Term Flux Measurement

Taejin Choi(1), Jin I. Yun(2), Jong-Hwan Lim(3), Eun-Woo Park(4), Joon Kim(1)
(1)Deptartment of Atmospheric Sciences and Global Environment Laboratory, Yonsei University,
Seoul 120-749, Korea
(2)Department of Ecosystem Management and Engineering, Kyung Hee University, Suwon 449-701, Korea
(3)Division of Forest Ecology, Korea Forest Research Institute, Seoul 130-712, Korea
(4)National Instrumentation Center for Environmental Management, Seoul National University,
Suwon 441-744, Korea

(Received April 15, 2002; Accepted June 04, 2002)

ABSTRACT
Calibration experiments were executed to document pertinent calibration methods for open-path infrared gas analyzer (OP-2) in field operations and to quantify their performance characteristics in continuous long-term flux measurements. Based on our results, we concluded: (1) flow rate of 2.0 L min$^{-1}$ 수식 이미지 can be used for calibration instead of the recommended 0.5 L min$^{-1}$ 수식 이미지 . Such faster flow rate brings the sampled air in the calibration hood at equilibrium within 5 min for $CO_2$ 수식 이미지 and 10 min for $H_2O$ 수식 이미지; (2) after reaching equilibrium, two-minute average sampling for related variables per each concentration may be sufficient; (3) use of four concentration is needed to derive the nonlinear calibration equation for water vapor with 1% uncertainty of flux measurement; and (4) the resultant calibration interval for OP-2 for both $CO_2$ 수식 이미지 and $H_2O$ 수식 이미지 is approximately one month.

Keyword: long-term flux measurement, open-path infrared gas analyzer, calibration factors

MAIN

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