|
|
 |
|
|
Ann. Geophys., 24, 1523-1535, 2006
www.ann-geophys.net/24/1523/2006/
© European Geosciences Union 2006
Inverse modeling of emissions for local photooxidant pollution: Testing a new methodology with kriging constraints
I. Pison1, L. Menut2, and N. Blond3
1LISA, Université Paris 7, Paris 12, CNRS, UMR7583, Créteil, France
2LMD/IPSL, UMR8539, Ecole Polytechnique, Palaiseau, France
3LISA, Université Paris 7, Paris 12, CNRS, UMR7583, Créteil, France
Abstract. A new methodology for the inversion of anthropogenic emissions at a local
scale is tested. The inversion constraints are provided by a kriging
technique used in air quality forecast in the Paris area, which computes an
analyzed concentration field from network measurements and the first-guess
simulation of a CTM. The inverse developed here is based on the CHIMERE model
and its adjoint to perform 4-D integration. The methodology is validated on
synthetic cases inverting emission fluxes. It is shown that the
information provided by the analyzed concentrations is sufficient to reach a
mathematically acceptable solution to the optimization, even when little
information is available in the measurements. As compared to the use of
measurements alone or of measurements and a background matrix, the use of
kriging leads to a more homogeneous distribution of the corrections, both in
space and time. Moreover, it is then possible to double the accuracy of the
inversion by performing two kriging-optimization cycles. Nevertheless,
kriging analysis cannot compensate for a very important lack of information in
the measurements.
Full Article in PDF (1344 KB) |
|
|
