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| Titel |
Calibration of sealed HCl cells used for TCCON instrumental line shape monitoring |
| VerfasserIn |
F. Hase, B. J. Drouin, C. M. Roehl, G. C. Toon, P. O. Wennberg, D. Wunch, T. Blumenstock, F. Desmet, D. G. Feist, P. Heikkinen, M. De Mazière, M. Rettinger, J. Robinson, M. Schneider, V. Sherlock, R. Sussmann, Y. Té, T. Warneke, C. Weinzierl |
| 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 ; 6, no. 12 ; Nr. 6, no. 12 (2013-12-16), S.3527-3537 |
| Datensatznummer |
250085135
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| Publikation (Nr.) |
 copernicus.org/amt-6-3527-2013.pdf |
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| Zusammenfassung |
| The TCCON (Total Carbon Column Observing Network) FTIR (Fourier transform infrared) network provides
highly accurate observations of greenhouse gas column-averaged dry-air mole
fractions. As an important component of TCCON quality assurance, sealed
cells filled with approximately 5 mbar of HCl are used for instrumental line shape
(ILS) monitoring at all TCCON sites. Here, we introduce a calibration
procedure for the HCl cells which employs a refillable, pressure-monitored
reference cell filled with C2H2. Using this method, we identify
variations of HCl purity between the TCCON cells as a non-negligible
disturbance. The new calibration procedure introduced here assigns effective
pressure values to each individual cell to account for additional broadening
of the HCl lines. This approach will improve the consistency of the network
by significantly reducing possible station-to-station biases due to
inconsistent ILS results from different HCl cells. We demonstrate that the
proposed method is accurate enough to turn the ILS uncertainty into an error
source of secondary importance from the viewpoint of network consistency. |
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