 |
| Titel |
Inverse modelling of methane and carbon monoxide emissions together with 3D-formaldehyde production from satellite measurements. |
| VerfasserIn |
I. Pison, A. Fortems-Cheiney, F. Chevallier, P. Bousquet, S. Szopa |
| Konferenz |
EGU General Assembly 2009
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250020723
|
|
|
|
|
|
| Zusammenfassung |
| Satellites nowadays provide measurements for various atmospheric constituents with a lower
accuracy than for the ground stations but a remarkable spatiotemporal coverage. These data
can now be combined in sophisticated inversion systems that take the impact of the chemistry
of the lower atmosphere into account.
In order to improve our knowledge of the emissions of greenhouse gases and of their
precursors at the global scale, we have developed a system for the inversion of the emission
fluxes and 3D-production of the gases involved in the oxidation chain of methane (CH4), in
particular formaldehyde (HCHO) and carbon monoxide (CO), reacting with hydroxyl radicals
(OH).
The interactions between these molecules are modelled based on a simplified version of
the module of atmospheric chemistry INCA implemented in the atmospheric transport
model LMDz, guided by the winds of the ECMWF analyses. The inversion scheme
is based on Bayesian inference: a variational system, developed at LSCE from
the ECMWF four-dimensional variational system (4D-Var), has been adapted for
this.
We present here the results of the inversion for global surface fluxes of CO and CH4
and global 3D-concentration fields of HCHO, obtained with observations from
MOPITT for CO, from SCIAMACHY for CH4 and from OMI for HCHO (plus
surface data for methyl-chloroform to constrain OH concentrations) on months
August to December of the year 2004, a period during which all three satellites were
operational. We compare these results to what can be obtained with surface data only. |
|
|
|
|
|
|