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Calibration of sealed HCl cells used for TCCON instrumental line shape monitoring

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Author(s): 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

Journal: Atmospheric Measurement Techniques Discussions
ISSN 1867-8610

Volume: 6;
Issue: 4;
Start page: 7185;
Date: 2013;
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ABSTRACT
The TCCON (Total Carbon Column Observing Network) FTIR network provides highly accurate observations of greenhouse gases column-averaged dry-air mole fractions. As an important component of TCCON quality assurance measures, sealed cells filled with approx. 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 applies a refillable, pressure-monitored reference cell filled with C2H2. Using this method, we identify residual variations of HCl purity between the TCCON cells as a non-negligible disturbance.
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