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| Titel |
On using radon-222 and CO2 to calculate regional-scale CO2 fluxes |
| VerfasserIn |
A. I. Hirsch |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 7, no. 14 ; Nr. 7, no. 14 (2007-07-17), S.3737-3747 |
| Datensatznummer |
250005135
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| Publikation (Nr.) |
 copernicus.org/acp-7-3737-2007.pdf |
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| Zusammenfassung |
| Because of its ubiquitous release on land and well-characterized atmospheric
loss, radon-222 has been very useful for deducing fluxes of greenhouse gases
such as CO2, CH4, and N2O. It is shown here that the
radon-tracer method, used in previous studies to calculate regional-scale
greenhouse gas fluxes, returns a weighted-average flux (the flux field F
weighted by the sensitivity of the measurements to that flux field, f) rather
than an evenly-weighted spatial average flux. A synthetic data study using a
Lagrangian particle dispersion model and modeled CO2 fluxes suggests
that the discrepancy between the sensitivity-weighted average flux and
evenly-weighted spatial average flux can be significant in the case of
CO2, due to covariance between F and f for biospheric CO2 fluxes
during the growing season and also for anthropogenic CO2 fluxes in
general. A technique is presented to correct the radon-tracer derived fluxes
to yield an estimate of evenly-weighted spatial average CO2 fluxes. A
new method is also introduced for correcting the CO2 flux estimates for
the effects of radon-222 radioactive decay in the radon-tracer method. |
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