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| Titel |
Representativeness analysis of routine airborne CO2 measurements for validating satellite measurements |
| VerfasserIn |
H. Chen, K. Katrynski, C. Gerbig |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250028133
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| Zusammenfassung |
| Tracer profiles measured by aircraft are the method of choice to link satellite measurements
of atmospheric constituents to calibration scales used in ground based observing networks,
which have provided the long-term backbone of atmospheric monitoring. Profiles
can be collected in a routine way either using rental aircraft or from commercial
airliners. In order to utilize these data for validation of remotely sensed column
measurements, it is important to assess the spatial representativeness of the different profile
locations.
High accuracy in situ CO2 measurements have been made aboard rental aircraft over
northeast Poland weekly since August 2008. Good agreements are found in the comparisons
between the in situ CO2 and the analysis results of flasks that are taken during the same flight.
During each flight, two profiles are taken with a spatial separation of 20 kilometers. Analysis
of the corresponding spatial variability of the columns is presented. Combination of flight
profiles with a 300 meter tall tower with measurements at different levels enables us to
calculate the column mean of CO2between surface and 2.5 km altitude, the part
of the atmosphere with the largest variability due to recent influence by surface
fluxes.
Starting from 2011, IAGOS-ERI (Integration of routine Aircraft measurements into a
Global Observing System – European Research Infrastructure) will provide continuous CO2
and CH4 measurements using instruments deployed aboard commercial airliners, with many
profiles during take-off and landing over airports distributed all over the globe.
Since these airports are usually colocated with larger populated areas and thus with
emissions from fossil fuel combustion, the representativeness of tracer profiles
need to be assessed. We analyzed CO measurements over Frankfurt airport from
the MOZAIC using STILT (the Stochastic Time Inverted Lagrangian Transport
model) combined with a high resolution CO emission map in central Europe. The
analysis provides information on under which circumstances such profiles can be
used for validation of remotely sensed column mixing ratios of CO2 and CH4. |
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