What question did this study set out to answer?

To derive mathematical corrections for atmospheric turbulent flux measurements of minor constituents caused by density fluctuations from simultaneous heat and water vapour transfer.

January 1, 1980Quarterly Journal of the Royal Meteorological Society

Correction of flux measurements for density effects due to heat and water vapour transfer

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Authors

EWE. K. WebbCalifornia Institute of Technology GPG. I. PearmanThe University of Melbourne RLR. LeuningCSIRO Oceans and Atmosphere

Discussion

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Implication

Theoretical analysis demonstrates substantial density-driven errors in trace gas flux measurements, highlighting the necessity of temperature and moisture corrections.

Key Points

To derive mathematical corrections for atmospheric turbulent flux measurements of minor constituents caused by density fluctuations from simultaneous heat and water vapour transfer.
Formulated theoretical transport equations for vertical constituent transfer in the lower atmosphere using eddy covariance and mean gradient techniques.
Evaluated density correction requirements across diverse sensor operating modes, including dry-air mixing ratios, moist-air specific mass, and direct in situ density measurements.
In situ density measurements require simultaneous corrections for sensible heat and water vapour fluxes, with heat flux generating an effect roughly five times larger than an equivalent latent heat flux.
Correction magnitudes for carbon dioxide flux frequently exceed the magnitude of the measured flux itself, whereas water vapour flux corrections typically range from a few percent to over 10 percent.
No density corrections are needed when instruments measure mixing ratios relative to dry air or when gas samples are dried and brought to a constant temperature before detection.

Cite This Study

Webb et al. (1980) studied this question.

synapsesocial.com/papers/69ded4516bae133e7de95249 https://doi.org/10.1002/qj.49710644707

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January 1, 1980Quarterly Journal of the Royal Meteorological Society

Correction of flux measurements for density effects due to heat and water vapour transfer

View Full Paper

Ask AI

Bookmark

Authors

EWE. K. WebbCalifornia Institute of Technology GPG. I. PearmanThe University of Melbourne RLR. LeuningCSIRO Oceans and Atmosphere

Discussion

Member takes

Implication

Theoretical analysis demonstrates substantial density-driven errors in trace gas flux measurements, highlighting the necessity of temperature and moisture corrections.

Key Points

To derive mathematical corrections for atmospheric turbulent flux measurements of minor constituents caused by density fluctuations from simultaneous heat and water vapour transfer.
Formulated theoretical transport equations for vertical constituent transfer in the lower atmosphere using eddy covariance and mean gradient techniques.
Evaluated density correction requirements across diverse sensor operating modes, including dry-air mixing ratios, moist-air specific mass, and direct in situ density measurements.
In situ density measurements require simultaneous corrections for sensible heat and water vapour fluxes, with heat flux generating an effect roughly five times larger than an equivalent latent heat flux.
Correction magnitudes for carbon dioxide flux frequently exceed the magnitude of the measured flux itself, whereas water vapour flux corrections typically range from a few percent to over 10 percent.
No density corrections are needed when instruments measure mixing ratios relative to dry air or when gas samples are dried and brought to a constant temperature before detection.

Cite This Study

Webb et al. (1980) studied this question.

synapsesocial.com/papers/69ded4516bae133e7de95249 https://doi.org/10.1002/qj.49710644707

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