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| Titel |
Combined FTIR-micrometeorological techniques for long term flux measurements of greenhouse gases and their applicability for 13CO2 fluxes |
| VerfasserIn |
Thorsten Warneke, Chris Caldow, David Griffith |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250034918
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| Zusammenfassung |
| Fourier Transform InfraRed (FTIR) spectrometry has been deployed for continuous long term
flux measurements on a flat, homogeneous circular grass paddock in New South Wales,
Australia. The rationale for using FTIR spectrometry is its capability to measure many
species simultaneously. The flux measurement techniques combined with FTIR –
spectrometry in this study were Disjunct Eddy Accumulation (DEA) and Flux-Gradient
(FG).
The fluxes of CO2 derived from the FTIR-DEA and FTIR-FG measurements agree well and
have been validated by Eddy Covariance Licor measurements. Variations in the observed
fluxes could be attributed to temperature increase and water availability over the 5 months
measurement period. In addition to CO2, CH4, CO and N2O FTIR-spectrometry is also
capable to measure 13CO2. The isotopic fluxes of CO2 allow to separate net ecosystem
exchange of CO2 into its gross one-way component fluxes, ecosystem respiration and
photosynthesis. It has been shown that it is possible to measure the isoflux of CO2. |
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