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| Titel |
Validation of routine continuous airborne CO2 observations near the Bialystok Tall Tower |
| VerfasserIn |
H. Chen, J. Winderlich, C. Gerbig, K. Katrynski, A. Jordan, M. Heimann |
| 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 ; 5, no. 4 ; Nr. 5, no. 4 (2012-04-27), S.873-889 |
| Datensatznummer |
250002784
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| Publikation (Nr.) |
 copernicus.org/amt-5-873-2012.pdf |
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| Zusammenfassung |
| Since 2002 in situ airborne measurements of atmospheric CO2 mixing
ratios have been performed regularly aboard a rental aircraft near Bialystok
(53°08´ N, 23°09´ E), a city in northeastern Poland. Since August
2008, the in situ CO2 measurements have been made by a modified
commercially available and fully automated non-dispersive infrared (NDIR)
analyzer system. The response of the analyzer has been characterized and the
CO2 mixing ratio stability of the associated calibration system has
been fully tested, which results in an optimal calibration strategy and
allows for an accuracy of the CO2 measurements within 0.2 ppm. Besides
the in situ measurements, air samples have been collected in glass flasks
and analyzed in the laboratory for CO2 and other trace gases. To
validate the in situ CO2 measurements against reliable discrete flask
measurements, we developed weighting functions that mimic the temporal
averaging of the flask sampling process. Comparisons between in situ and
flask CO2 measurements demonstrate that these weighting functions can
compensate for atmospheric variability, and provide an effective method for
validating airborne in situ CO2 measurements. In addition, we show the
nine-year records of flask CO2 measurements. The new system, automated
since August 2008, has eliminated the need for manual in-flight
calibrations, and thus enables an additional vertical profile, 20 km away,
to be sampled at no additional cost in terms of flight hours. This sampling
strategy provides an opportunity to investigate both temporal and spatial
variability on a regular basis. |
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