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| Titel |
CO2 flux estimation from GOSAT measurements of CO2 for 2009 - 2010 |
| VerfasserIn |
S. Basu, S. Houweling, S. Guerlet, A. Butz |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250068704
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| Zusammenfassung |
| Multiple atmospheric inverse modeling schemes exist for inferring global carbon dioxide
(CO2) fluxes from surface layer measurements of CO2, including operational products such
as CarbonTracker. We present here an extension of those schemes by the addition of satellite
measurements of CO2 from the Japanese satellite GOSAT, which has now been operational
for more than two years.
We retrieve total column CO2 from GOSAT’s TANSO instrument using the
RemoTeC algorithm developed at SRON and KIT. We use a 4DVAR inversion
scheme to assimilate the retrieved CO2 and the surface CO2 measurements used in
CarbonTracker to show that the addition of GOSAT measurements in the assimilation
yields a global CO2 field that is closer to upper tropospheric CO2 measurements
such as HIPPO and CONTRAIL than a surface flask-only inversion. We also show
that assimilating GOSAT measurements increases the estimated growing season
carbon uptake over the northern temperate latitudes, compared to a surface flask-only
inversion. And finally, we find that the land-sea and north-south balance of CO2
sources and sinks is significantly impacted by GOSAT measurements, owing to
the different spatial coverage of the GOSAT instrument compared to surface flask
samples.
We compare these conclusions – drawn from the assimilation of GOSAT CO2
measurements – with the existing state of knowledge about CO2 fluxes stemming from other
inverse modeling products, and examine the robustness of our conclusions in cases
where they differ significantly from existing surface flask-based CO2 inversions. |
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