Addressing a systematic bias in carbon dioxide flux measurements with the EC150 and the IRGASON open-path gas analyzers
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- 作者：M. Helbiga ; manuel.helbig@umontreal.ca" class="auth_mail" title="E-mail the corresponding author ; K. Wischnewskia ; G.H. Gosselina ; S.C. Biraudb ; I. Bogoevc ; W.S. Chanb ; E.S. Euskirchend ; A.J. Glenne ; P.M. Marshf ; W.L. Quintonf ; O. Sonnentaga
- 关键词：Carbon dioxide fluxes ; Eddy covariance ; Open-path infrared gas analyzer ; Systematic error ; Sensible heat ; Absorption
- 刊名：Agricultural and Forest Meteorology
- 出版年：2016
- 出版时间：15 November 2016
- 年：2016
- 卷：228-229
- 期：Complete
- 页码：349-359
- 全文大小：2434 K
文摘
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CO2 flux measurement errors (IRGASON & EC150) scale with kinematic temperature flux.
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Relative errors are most pronounced when true CO2 flux is small and heat flux large.
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Using a fast-response air temperature to scale CO2 absorption minimizes bias.
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Agreement between open- and closed-path IRGA CO2 fluxes is substantially improved.
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Fast-instead of slow-response air temperature should be used to scale CO2 absorption.