Design, construction and operation of flux measurement systems using the conditional sampling technique

I J Beverland, D H Oneill, S L Scott, J B Moncrieff

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

The design, construction and field operation of computer-based systems for the measurement of trace gas fluxes using the conditional sampling technique are described. A simple system which sampled air into sampling bags was used to measure CH4 and N2O fluxes from peatland and agricultural land, respectively. The system was subsequently automated by making real-time measurements of the gas mixing ratios in the sampling lines thus providing continuous measurements for periods of up to several days. Minor modifications enabled measurement of total hydrocarbons, CO2 and non-methane hydrocarbon fluxes from a forest ecosystem. Intercomparison of conditional sampling with other techniques (eddy covariance, gradient and aircraft boundary layer budget) was encouraging with good agreement between flux measurements of CH4, CO2, N2O and sensible heat. The system has been developed in a sufficiently simple and robust manner to enable extended field measurements. A number of theoretical problems remain including the absolute accuracy of the gas analysis procedures and real-time coordinate rotation procedures to deal with non-uniform terrain. 

LanguageEnglish
Pages3209-3220
Number of pages12
JournalAtmospheric Environment
Volume30
Issue number18
DOIs
Publication statusPublished - Sep 1996

Fingerprint

flux measurement
sampling
nonmethane hydrocarbon
eddy covariance
trace gas
peatland
gas
mixing ratio
forest ecosystem
aircraft
agricultural land
boundary layer
hydrocarbon
air
sampling technique

Keywords

  • conditional sampling
  • relaxed eddy accumulation
  • trace gas fluxes
  • carbon dioxide
  • methane
  • non-methane hydrocarbons
  • atmosphere-surface exchange
  • micrometeorology
  • water vapor

Cite this

Beverland, I J ; Oneill, D H ; Scott, S L ; Moncrieff, J B . / Design, construction and operation of flux measurement systems using the conditional sampling technique. In: Atmospheric Environment. 1996 ; Vol. 30, No. 18. pp. 3209-3220.
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Design, construction and operation of flux measurement systems using the conditional sampling technique. / Beverland, I J ; Oneill, D H ; Scott, S L ; Moncrieff, J B .

In: Atmospheric Environment, Vol. 30, No. 18, 09.1996, p. 3209-3220.

Research output: Contribution to journalArticle

TY - JOUR

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AU - Oneill, D H

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AB - The design, construction and field operation of computer-based systems for the measurement of trace gas fluxes using the conditional sampling technique are described. A simple system which sampled air into sampling bags was used to measure CH4 and N2O fluxes from peatland and agricultural land, respectively. The system was subsequently automated by making real-time measurements of the gas mixing ratios in the sampling lines thus providing continuous measurements for periods of up to several days. Minor modifications enabled measurement of total hydrocarbons, CO2 and non-methane hydrocarbon fluxes from a forest ecosystem. Intercomparison of conditional sampling with other techniques (eddy covariance, gradient and aircraft boundary layer budget) was encouraging with good agreement between flux measurements of CH4, CO2, N2O and sensible heat. The system has been developed in a sufficiently simple and robust manner to enable extended field measurements. A number of theoretical problems remain including the absolute accuracy of the gas analysis procedures and real-time coordinate rotation procedures to deal with non-uniform terrain. 

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KW - atmosphere-surface exchange

KW - micrometeorology

KW - water vapor

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