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| Titel |
Footprint analysis for ground-based total column CO2 stations |
| VerfasserIn |
D. G. Feist, C. Rödenbeck, M. Heimann |
| 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 |
250030662
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| Zusammenfassung |
| From early 2009, the satellite instruments OCO and GOSAT will provide dedicated global
measurements of CO2 mixing ratio. These space borne observations will have to be validated
with observations of ground based instruments. However, there are distinct differences
between CO2 mixing ratio in the planetary boundary layer versus CO2 mixing ratio in the
free troposphere and above. Since the satellite instruments provide total column observations
of CO2 mixing ratio, their data cannot be easily compared to ground-based in-situ
measurements. Therefore, ground-based measurements of total column CO2 mixing ratio are
essential.
To provide such measurements, networks of ground-based Fourier Transform Infrared
(FTIR) instruments like the Total Carbon Column Observing Network (TCCON) have been
set up. The TCCON network is still growing and several instruments in very different areas of
the world should join in the future. One of the important questions is where new instruments
should be placed.
This study shows an analysis of the footprints of several active or proposed stations
within the TCCON network. The footprint is defined as the typical area where air parcels that
are observed by the station originate. The calculations were done by adapting the adjoint of
the TM3 model to calculate total columns. The footprint analysis is a useful tool to
find optimal locations for new stations and improve overall network performance. |
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