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| Titel |
Retrieval of tropospheric column-averaged CH4 mole fraction by solar absorption FTIR-spectrometry using N2O as a proxy |
| VerfasserIn |
Z. Wang, N. M. Deutscher, T. Warneke, J. Notholt, B. Dils, D. W. T. Griffith, M. Schmidt, M. Ramonet, C. Gerbig |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 7, no. 10 ; Nr. 7, no. 10 (2014-10-06), S.3295-3305 |
| Datensatznummer |
250115919
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| Publikation (Nr.) |
 copernicus.org/amt-7-3295-2014.pdf |
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| Zusammenfassung |
| Tropospheric column-averaged CH4 mole fractions were derived from
ground-based column absorption measurements. The method uses stratospheric
N2O columns to correct for the stratospheric contribution to the
CH4 total column. The method was applied to four Total Carbon Column Observing Network (TCCON) sites covering
locations from the Northern Arctic to the tropics. It performs well for all
sites. The derived tropospheric CH4 concentrations were compared with
profiles measured by aircraft at three sites. The results indicate an
inter-site consistency within 6 ppb (~0.3%). With aircraft
profiles up to 3 km, the seasonal behavior of the derived tropospheric
CH4 concentration was also checked, revealing a difference of around
20 ppb. The mean relative uncertainty of the four sites, as estimated from the
daily standard deviations, is 0.23%. |
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