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| Titel |
Methodology and calibration for continuous measurements of biogeochemical trace gas and O2 concentrations from a 300-m tall tower in central Siberia |
| VerfasserIn |
E. A. Kozlova, A. C. Manning |
| 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 ; 2, no. 1 ; Nr. 2, no. 1 (2009-05-26), S.205-220 |
| Datensatznummer |
250000438
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| Publikation (Nr.) |
 copernicus.org/amt-2-205-2009.pdf |
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| Zusammenfassung |
| We present an integrated system for measuring atmospheric
concentrations of CO2, O2, CH4, CO, and N2O in central
Siberia. Our project aims to demonstrate the feasibility of establishing
long-term, continuous, high precision atmospheric measurements to elucidate
greenhouse gas processes from a very remote, mid-continental boreal
environment. Air is sampled from five heights on a custom-built 300-m tower.
Common features to all species' measurements include air intakes, an air
drying system, flushing procedures, and data processing methods. Calibration
standards are shared among all five measured species by extending and
optimising a proven methodology for long-term O2 calibration. Our
system achieves the precision and accuracy requirements specified by the
European Union's "CarboEurope" and "ICOS" (Integrated Carbon Observing
System) programmes in the case of CO2, O2, and CH4, while CO
and N2O require some further improvements. It was found that it is not
possible to achieve these high precision measurements without skilled
technical assistance on-site, primarily because of 2–3 month delays in
access to data and diagnostic information. We present results on the
stability of reference standards in high pressure cylinders. It was also
found that some previous methods do not mitigate fractionation of O2 in
a sample airstream to a satisfactory level. |
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