 |
| Titel |
Inverse modelling of CO2 sources and sinks using satellite data and the importance of transport model uncertainties |
| VerfasserIn |
S. Houweling, I. Aben, F.-M. Bréon, F. Chevallier, R. Engelen, C. Gerbig, K. Hungershoefer, J. Marshall, S. Serrar |
| Konferenz |
EGU General Assembly 2009
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250029155
|
|
|
|
|
|
| Zusammenfassung |
| OCO and GOSAT will likely bring a wealth of accurate total column CO2 measurements
that will allow the estimation of CO2 sources and sinks from space. Meanwhile
even more advanced measurement concepts are being investigated for the next
generation of instruments, such as the CO2 lidar A-SCOPE. Despite numerous attempts
to simulate the benefit of remote sensing for the quantification of CO2 sources
and sinks using theoretical Observing System Simulation Experiments (OSSEs)
it is difficult to predict the performance of a real-world application. One of the
potentially important shortcomings of the OSSEs, which have been reported so far, is
the difficulty to account, in a realistic manner, for the impact of transport model
uncertainties. As part of a preparatory study for the A-SCOPE mission we have tried to
quantify these errors using a model inter-comparison experiment, including the
IFS, LMDZ, TM3, and TM5 models. Synthetic A-SCOPE measurements were
generated for each model using a common setup of CO2 fluxes and initial boundary
conditions. The difference between the samples generated by any combination
of models has been prescribed as pseudo measurements in CO2 inversions. The
deviations of the retrieved fluxes from the true (common set-up) fluxes quantify
the impact model errors provided that the ensemble of models can be considered
a realistic representation of transport model uncertainty. This representativeness
has been tested by comparing the ensemble performance against available total
column CO2 measurements. The derived transport model uncertainties are put into
perspective by comparison with the anticipated A-SCOPE measurement uncertainties. |
|
|
|
|
|
|