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| Titel |
Representativeness analysis of CO2 profiles near a tall tower and from commercial airliner programs |
| VerfasserIn |
Huilin Chen, Krzysztof Katrynski, Philippe Nédélec, Toshinobu Machida, Hidekazu Matsueda, Yousuke Sawa, Christoph Gerbig |
| 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 |
250041887
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| Zusammenfassung |
| Aircraft profiles for atmospheric trace gases have been collected using both rental aircraft and
from commercial airliners. High-accuracy regular in situ CO2 measurements aboard rental
aircraft over northeast Poland have been upgraded since August 2008. During each flight, two
profiles are taken with a spatial separation of 20 kilometers. Until now, 74 profiles with
continuous CO2 have been collected. Meanwhile, aircraft profiles for carbon monoxide (CO)
have been made aboard commercial airliners within MOZAIC (Measurement of Ozone, water
vapor, carbon monoxide and nitrogen oxides by AIrbus in-service airCraft) and for CO2
within CONTRAIL (Comprehensive Observation Network for TRace gases byAIrLiner)
respectively.
Starting from 2011, IAGOS-ERI (Integration of routine Aircraft measurements into a
Global Observing System – European Research Infrastructure) will provide continuous CO2,
CH4 and H2O measurements using instruments deployed aboard commercial airliners,
with many profiles during take-off and landing over airports distributed all over the
globe.
These profiles contain not only vertical gradients but also regionally representative
information. It is of importance to investigate how these profiles could be used for
applications such as satellite validation and inverse modeling to retrieve surface-atmosphere
exchange fluxes of greenhouse gases at regional to continental scales. Especially
profiles from commercial airliners near major cities, which are potentially influenced
by local fossil fuel emissions, need to be assessed with respect to their regional
representativeness. We analyzed CO profiles over Frankfurt airport from the MOZAIC and
CO2 profiles from CONTRAIL using STILT (the Stochastic Time Inverted Lagrangian
Transport model) combined with a high resolution CO emission map in central
Europe. Combining STILT footprints (maps of sensitivities to upstream surface
fluxes) with high resolution emission inventories allows to attribute the contribution
fossil fuel emissions to local vs. regional sources. In contrast, we analyzed CO2
profiles over northeast Poland in a similar way, where fossil fuel emissions are
insignificant.
The representativeness analysis provides information on under which circumstances such
profiles can be used for potential applications, i.e. satellite validation and inverse modeling.
The analysis suggests that a combined measurement of CO2 and CO significantly
improves the usability of the regular profiles, where CO serves as the emission tracer. |
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