Addressing the influence of instrument surface heat exchange on the measurements of CO2 flux from open‐path gas analyzers

@article{Burba2008AddressingTI,
  title={Addressing the influence of instrument surface heat exchange on the measurements of CO2 flux from open‐path gas analyzers},
  author={George Burba and Dayle K McDermitt and Achim Grelle and Daniel J. Anderson and Liukang Xu},
  journal={Global Change Biology},
  year={2008},
  volume={14}
}
There is a growing concern in the flux community that using the eddy covariance method with open‐path CO2 analyzers often leads to measurements of an apparent ecosystem CO2 uptake during off‐season periods, especially in cold climates. Such uptake has not been observed when measurements were made with closed‐path analyzers, chambers, or profile methods, suggesting it is an artifact due in some way to the use of open‐path analyzers. In this study, a series of laboratory tests and field… 
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References

SHOWING 1-10 OF 31 REFERENCES
Fine-wire thermometer to correct CO2 fluxes by open-path analyzers for artificial density fluctuations
Apparent downward CO2 flux observed with open-path eddy covariance over a non-vegetated surface
SummaryThe open-path eddy covariance (EC) method often shows unlikely downward CO2 fluxes in late winter and early spring over drained paddy fields with few active plants. To understand why, we
A Portable Eddy Covariance System for the Measurement of Ecosystem–Atmosphere Exchange of CO2, Water Vapor, and Energy
Abstract To facilitate the study of flux heterogeneity within a region, the authors have designed and field-tested a portable eddy covariance system to measure exchange of CO2, water vapor, and
Measurements of carbon sequestration by long‐term eddy covariance: methods and a critical evaluation of accuracy
The turbulent exchanges of CO2 and water vapour between an aggrading deciduous forest in the north-eastern United States (Harvard Forest) and the atmosphere were measured from 1990 to 1994 using the
Evaluation of uncertainty in eddy covariance measurements within Fluxnet-Canada
The Fluxnet-Canada Research Network (FCRN) is committed to rigorous quality assessment of the turbulent flux and climate data collected across the network. FCRN Protocols establish common procedures
A highly portable, rapidly deployable system for eddy covariance measurements of CO2 fluxes
To facilitate the study of flux heterogeneity within a region, the authors have designed, built, and field-tested a highly portable, rapidly deployable, eddy covariance CO{sub 2} flux measurement
Correction of flux measurements for density effects due to heat and water vapour transfer
When the atmospheric turbulent flux of a minor constituent such as CO2 (or of water vapour as a special case) is measured by either the eddy covariance or the mean gradient technique, account may
Eddy covariance measurements of CO2 and sensible and latent heat fluxes during a full year in a boreal pine forest trunk-space
TLDR
The eddy covariance method provided a similar daily cycle to the chamber method but there was a discrepancy between their mean levels.
CO2 flux measured by an open-path system over a larch forest during the snow-covered season
In the northern part of Japan, snow covers the land for severah months in winter. It is necessary to estimate the CO 2 flux during the snow-cover season to evaluate annual net CO 2 exchange between
An eddy covariance mesonet to measure the effect of forest age on land–atmosphere exchange
We deployed a mesonet of year‐round eddy covariance towers in boreal forest stands that last burned in ∼1850, ∼1930, 1964, 1981, 1989, 1998, and 2003 to understand how CO2 exchange and
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