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Quality Control and Characteristic of Eddy Covariance Data in the Region of Nakdong River

낙동강 유역에서 관측된 에디 공분산 자료의 품질 관리 및 플럭스 특성

  • Lee, Young-Hee (Department of Astronomy and Atmospheric Sciences, Kyungpook National University) ;
  • Lee, Byoungju (Applied Meteorological Research Lab., National Institute of Meteorological Research) ;
  • Kahng, Keumah (Applied Meteorological Research Lab., National Institute of Meteorological Research) ;
  • Kim, Soo-Jin (Department of Astronomy and Atmospheric Sciences, Kyungpook National University) ;
  • Hong, Seon-Ok (Department of Astronomy and Atmospheric Sciences, Kyungpook National University)
  • 이영희 (경북대학교천문대기과학과) ;
  • 이병주 (국립기상연구소응용기상연구과) ;
  • 강금아 (국립기상연구소응용기상연구과) ;
  • 김수진 (경북대학교천문대기과학과) ;
  • 홍선옥 (경북대학교천문대기과학과)
  • Received : 2013.04.08
  • Accepted : 2013.07.16
  • Published : 2013.09.30

Abstract

We performed comprehensive quality control for eddy-covariance measurements from 3 farmland sites and 1 industrial site adjacent to Nakdong river. The quality control program is based on Foken and Wichura (1996) and Vicker and Mahrt (1997) and we added criteria for trend and standard deviation for scalar variables and modified criteria for non-stationarity condition of Foken and Wichura (1996) to consider random error of fluxes. The classification of data quality is designed for the raw data and the processed flux data, separately. Use of added criteria efficiently reduces the number of outlier for water vapor and $CO_2$ fluxes and use of modified criteria for non-stationarity reduces the number of outlier for scalar fluxes and increases the number of data with accepted quality for further work. Energy balance ratio is higher in farmlands than industrial site, which is due to neglect of heat storage term in industrial site. Among farmland sites, C4 site shows higher energy balance ratio than other sites. This is due to more homogeneous surface of C4 site than other farmland sites. However, energy balance ratio is very low or even negative at night. Mismatch between the flux footprint and the other energy component footprint over the heterogeneous surface is main cause for energy imbalance at night. Other possible causes are also discussed.

Keywords

Acknowledgement

Grant : 응용기상기술개발 연구

Supported by : 국립기상연구소

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