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| Titel |
The IMECC aircraft campaign: validation of total column CO2, CH4 and CO measurements over Europe |
| VerfasserIn |
Dietrich Feist, Christoph Gerbig, Marc Geibel, Huilin Chen, Olaf Kolle, Martin Hertel, Stephan Baum, Janina Messerschmidt, Justus Notholt, Mathias Palm, Katinka Petersen, Benjamin Sampson, Christof Petri, Thorsten Warneke, Thomas Blumenstock, Frank Hase, Ieda Pscheidt, Markus Rettinger, Ralf Sussmann, Francois Truong, Irène Xuéref-Rémy, Krzysztof Katrynski, Rolf Maser, Christoph Klaus, Dieter Schell |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250043317
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| Zusammenfassung |
| Ground-based in-situ measurements of CO2 and CH4 are a well-established technique for the
estimation of sources and sinks for these major greenhouse gases. In the future, total-column
measurements from satellite instruments like GOSAT or ground-based FTIR networks
like TCCON should play an increasing role in this field. To make both types of
measurements comparable, the total-column measurements need to be linked to the
well-established WMO scales for greenhouse gases. For ground-based FTIR instruments
this can be achieved through aircraft in-situ measurements above the measurement
sites.
To provide this link, the Max Planck Institute for Biogeochemistry (MPI-BGC) organized
a flight campaign that covered six FTIR sites in Europe: one in France, one in Poland and
four in Germany. The aircraft used was a Learjet 35 which could cover an altitude range from
roughly 300 m to 12-13 km above each FTIR site. For continuous measurements, the
aircraft was equipped with a Picarro analyzer for CO2 and CH4 and an Aerolaser
CO instrument. In addition, roughly eight flasks were taken at different altitude
levels above each station to assure the quality of the continuous measurements.
The flasks were then analyzed post-flight at the MPI-BGC’s gas analysis lab. This
flight campaign was one of the major efforts of the European infrastructure project
IMECC.
The aircraft measurements covered roughly 80% of the total column measured from the
ground. Several stations were located directly next to tall tower sites, so extension to the
ground was possible through the use of the tower measurements. The remaining stratospheric
part was estimated from balloon measurements taken at similar equivalent latitude for CO2.
For CH4, climatological data from satellites (e.g. UARS) was used to fill the gap. The main
goal was to provide realistic values for the total column as well as good estimates for the total
column error bars.
The techniques developed for the optimization of flight patterns and the data analysis
provide a role model for future aircraft campaigns. These will provide the essential
quality-assurance for ground-based or satellite remote sensing measurements as a valuable
addition to the established long-term flask records. |
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