Numerical simulation and parameterization of
chemical reactions in the aircraft wakes
1 year renewable
This work is part of project TC2 (Condensation Trails and
) whose main objective is to
better understand and quantify the impact of aircraft emissions
on the environment.
In this context, the prediction of the dispersion and mixing of
aircraft emissions and the atmosphere is a critical aspect to
understand how the small scale processes, that took place in the
wake of the plane, influence the physics and chemistry of the
atmosphere on a global scale. Indeed, current general
circulation models make the assumption that emissions are
instantaneously diluted over large meshes (a few hundred
kilometers), and therefore can not represent the heterogeneity
and the physicochemical transformations occurring in the wake of
A method called "Effective Reaction Rates" has recently been
developed at CERFACS (Cariolle et al., 2009 Paoli et al., 2011)
to incorporate these effects into global models. The method is
based on a decomposition of the concentrations of each species
in a "background" contribution (corresponding to the part
resolved by global models) and a "plume" contribution
(corresponding to the part which is not diluted to background
level). The key point is to develop chemical parameterizations
for this last part (using data obtained from smaller scale
simulations) in order to take into account the plume
contribution into global models.
For this purpose it is necessary to simulate the evolution of
the atmospheric chemical composition and the changes in
emissions during the plume dispersion. The simulations will be
carried out with Meso-NH (a research meteorological model
supplemented with detailed chemical kinetic scheme) that solves
all the processes explicitly.
For this purpose, the candidate will have to (i) include in the
Meso-NH the homogeneous chemical reactions in the gas phase and
the heterogeneous chemical processes at the surface of particles
and ice crystals; (ii) perform LES (Large Eddy Simulations) of
the wake dispersion and chemical reactions;, (iii) analyze the
chemical database obtained with the simulations; and (iv) use
these data to build-up the chemical parameterization according
to the methodology mentioned above.
The post-doctoral offer excellent opportunities to publish
results in peer-reviewed international journals.
It is necessary to have a good experience in advanced numerical
simulation and a good level of technical/scientific English.
Experience in atmospheric chemistry and / or LES would be an
D. Cariolle, D. Caro, R. Paoli, D. Hauglustaine, B. Cuenot, A.
Cozic, and R. Paugam. Introduction of non-linear plume chemistry
into large-scale atmospheric models: application to aircraft
émissions. Journal of Geophysical Research, Vol. 114, D19302,
R. Paoli, D. Cariolle, and R. Sausen. Review of effective
emissions modeling and computation, Geoscientific Model
Development, Vol.4, pp. 643-667, 2011.
Name: Cariolle Daniel
around 2350 euros net