February 2020
Message 122

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[Met-jobs] Post-doctoral position in atmospheric processes at CNRM

From COUVREUX Fleur <>
Date Fri, 28 Feb 2020 16:43:11 +0100 (CET)

Post-doctoral position in atmospheric processes at CNRM (France):
Impact of mesoscale patterns on the boundary-layer processes and shallow clouds 
organisation within the trade wind: a modelling study

Required education: PhD in atmospheric science
From: as soon as 1st June
Duration: 18 months
Salary: from 2300 to 2500 euros net/month depending on experience (CNRS salary 
Contact: Fleur couvreux (CNRM,; Dominique Bouniol 
Application: should include a CV,  statement of research activities and 
interests as well as the contact information for two referees
Application closure date: 15/04/2020

The « Centre National des Recherches Météorologiques » (CNRM) is a joined 
research center of Meteo-France, the French weather service, and CNRS. To carry 
out its missions, CNRM hosts approximately 275 permanent positions (one third 
being research scientists), and about 60 students and visitors. The CNRM is 
divided in 7 groups, among which the mesoscale meteorology group, GMME, leads 
studies (experimentally and numerically) on mesoscale and microscale processes 
of the atmosphere and its interfaces.
TROPICS, the host team part of GMME, has a specific expertise on atmospheric 
convective processes, including their numerical modelling with both Large Eddy 
simulations and mesoscale models and their observations with in particular 
satellite data. In the last decade, the team members have been involved in 
numerous studies on boundary-layer and convective processes. The team is also 
involved in the process-oriented evaluation of the AROME-OM, an operational 
forecast model run every day at 2.5km resolution over a large area of the 

Boundary layer mechanisms leading to organization of shallow cumulus clouds 
investigated with Large-Eddy simulations and observations

        CONSTRAIN ( is a 4-year project 
funded by the European Union that started in May 2019. It aims at significantly 
improving our understanding of how natural and human factors affect 
multidecadal regional climate change in order to improve our capability to make 
climate projections for the next 20-50 years. It will rely on the combined 
analyses of CMIP6 runs with dedicated high resolution simulations and new 
observations to address identified knowledge gaps on radiative forcing, cloud 
feedbacks and the relationship between ocean variability and atmospheric 
change. One important objective is to make large use of observational data and 
in particular to take advantage of the dedicated field campaign on shallow 
cumulus, EUREC4A, that took place in January-February 2020 over Barbados (Bony 
et al. 2017). This field campaign provided observations of the low-cloud 
amount, of the lower vertical mixing of water vapour, and of the thermodynamic 
and dynamic environment in which the clouds form.
Work plan:  
 The main objective of the postdoc is to analyse the impact of mesoscale 
thermodynamical patterns on the boundary-layer processes and shallow clouds 
including their spatial organisation. To do so, the postdoc will mainly carry 
out different Large-Eddy simulations with Méso-NH (Lac et al 2018) focusing on 
two contrasted days where observations indicate different mesoscale 
organizations (probably Sugar and Flower type see Bony et al, 2020). A 
relatively large domain (~100km x 100km) inside the circle where most of 
aircraft observations were performed during the field campaign will be used. 
Sensitivity to different initial conditions starting from spatially homogeneous 
conditions towards more heterogeneous conditions provided either by 
observations (dropsondes from the HALO or variability inferred from satellites 
and different large-scale conditions derived either from the observations 
(large-scale velocity can be derived from frequent dropsondes launched on a 
circle , such a strategy was used during EUREC4A with a 90km radius circle) or 
from models at different resolutions (ECMWF analyses or AROME-OM, run 
operationally during the campaign at 2.5 and 1.3 km resolution)  will be 
studied. Additional sensitivities will be analysed such as the use of boundary 
conditions (cyclic or open boundary conditions with recycled turbulence as 
proposed by T Nagel, personal communication) as well as the influence of domain 
All those simulations will be evaluated with respect to observations acquired 
during EUREC4A as well as satellite observations providing information on the 
mesoscale organization of clouds, humidity, temperature. In particular various 
metrics of organization (White et al 2018) will be applied to this set of 
simulations. Those LES will also serve as benchmark simulations to evaluate the 
operational mesoscale model AROME. Once evaluated, they will serve for 
understanding how the mesoscale patterns modify the boundary-layer processes 
and cloud spatial organisation and how small scale and meso scale  interacts 
with each other.

Practical aspects:
At Météo-France location, it is possible to get a room in a student residence 
for 160 € per month. Otherwise, access from the city centre is easy by Metro 
and Bus.

Salary will depend on the previous experience, and may evolve along the 
contract, in agreement with legal and employer regulations, with a lower limit 
of 2000 € net pay per month.

The post-doctoral contract will be a 18-month.
It may start as soon as 1st June 2020, and preferably before 1st September 
2020, but will remain open until the position is filled.

To be eligible, the candidates should have a Ph.D. in the field of Atmospheric 
physics, with skills in meteorological modelling. Knowledge of atmospheric 
turbulence, convective parameterizations will be welcome. The successful 
candidate will have to run Large Eddy Simulations, in a Linux environment (with 
help from members of the team). He/she will be expected to attend international 
conferences and to publish his/her results in international peer-reviewed 

Candidates should submit, before 15 April 2020, by email, a cover letter with a 
statement of research activities and interests, a CV, as well as the contact 
information for two referees to:

Fleur Couvreux,
Dominique Bouniol,

Bony, S., B. Stevens, F. Ament, S. Bigorre, P. Chazette, S. Crewell, J. 
Delanoë, K. Emanuel, D. Farrell, C. Flamant, S. Gross, L. Hirsch, J. 
Karstensen, B. Mayer, L. Nuijens, J. H. Ruppert, I. Sandu, P. Siebesma, S. 
Speich, F. Szczap, J. Totems, R. Vogel, M. Wendisch, and M. Wirth. EUREC4A: A 
Field Campaign to Elucidate the Couplings Between Clouds, Convection and 
Circulation. Surveys in Geophysics, 38:1529-1568
Bony S and B Stevens, 2019: Measuring Area-averaged vertical motions with 
dropsondes. J Atmos Sci, 76, 767-783
Bony, S., Schulz H, Vial, J, B. Stevens, 2020: Sugar, Gravel, Fish and 
Flowers:Dependence of Mesoscale Patterns of Trade-wind Clouds on Environmental 
Conditions, Geo. Res. Letters, In press.
Lac C et al. 2018: Overview of the Meso-NH model version 5.4 and its 
applications, GMD, 11, 5, 1929-1969, doi://10.5194/gmd-11-1929-2018

White B. A., Buchanan A. M., Birch C.E., Stier, P., Pearson K.J.: Quantifying 
the effects of horizontal grid length and parameterized convection on the 
degree of convective organization using a metric of the potential for 
convective interaction. J. Atmos. Sci, 2018, 75, 425-450

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