May 2020
Message 8

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[Met-jobs] Postdoc at CNRM, Toulouse, France, on convection organisation

From ROEHRIG Romain <>
Date Wed, 6 May 2020 12:17:31 +0200 (CEST)

Applications are invited for an 18-month postdoctoral position (with possible 
extension) starting as soon as 1 September 2020, 
in the climate research group of the CNRM in Toulouse, France to work on the 
following subject: 

Self-organisation of deep convection in the CNRM climate model: Connecting the 
RCE idealized framework to the real atmosphere

The deadline for application is 31 May 2020.

Context and objectives:

Tropical convection organizes across a wide range of scales, driven by a 
variety of physical mechanisms. One type of organisation that arises in 
idealized numerical simulations, such as under the Radiative-Convective 
Equilibrium (RCE) hypothesis, is self-aggregation (e.g., Wing, 2019). This 
spontaneous organisation of deep convection has been studied in a wide range of 
models, from small-domain large-eddy simulations to global, Earth-scale 
simulations with climate models. This recently culminated in the RCE Model 
Intercomparison Project (RCEMIP, Wing et al. 2018), which seeks to better 
characterize the robustness of self-aggregation and better understand the 
underlying mechanisms such as its surface temperature dependence. 
Self-aggregation has also been shown to be sensitive to the coupling with the 
surface ocean and to surface temperature gradients (e.g., Coppin and Bony, 
2018).  The relevance of self-aggregation for the real atmosphere remains an 
open but key question. Although a recent review argued positively in this 
direction (Holloway et al. 2017), Jakob et al. (2019) questioned the RCE 
numerical framework over small domain as RCE is only observed at large scales 
(> 5000 km) and over period sufficiently long (> 1 month).
The present postdoctoral fellowship addresses two main objectives: (i) 
contribute to a better understanding of the processes underlying 
self-aggregation, their dependence to surface temperature and their robustness 
and (ii) assess the relevance of self-aggregation for the understanding of 
convection organization in the real atmosphere (e.g., ITCZ, tropical 
intraseasonal variability). We expect a specific focus on the coupling between 
convection organisation, large-scale circulation in the tropics and the surface 
ocean, and possibly on its implications for climate sensitivity. 

The successful applicant will have significant freedom to develop and implement 
its own strategy to tackle these two objectives. Depending on its background 
and interests, such strategies may include simulations from the RCEMIP 
ensemble, especially those performed with the CNRM model (CNRM-CM6, Roehrig et 
al. 2020, Voldoire et al. 2019), physics-perturbed ensembles with CNRM-CM6, 
intermediate model versions between CNRM-CM5 and CNRM-CM6, model hierarchies 
based on CNRM-CM6, possibly using intermediate configurations based on 
axisymmetric or non-axisymmetric aquaplanets or including a slab ocean model.

This position is funded by the Horizon 2020 European Union Programme, through 
the CONSTRAIN (Constraining uncertainty of multi-decadal climate projections) 
project ( 

Required qualifications:

1. Ph.D. in atmospheric sciences obtained before the starting date of the 
2. Expertise in convection processes or climate modelling will be appreciated;
3. Expertise in Unix, Fortran, Python, and experience in high performance 
4. A good command of English.

Practical information:

The successful applicant will be contracted by Météo-France and will be based 
at the “Centre National de Recherches Météorologiques”, Toulouse, France 
( within the climate research group. The opened 
position will start as soon as possible, possibly as early 1 September 2020 for 
an 18-month duration (with possible extension). The gross salary is 
commensurate with qualifications and experience, ranging from 3280€ and 3890€. 
This includes French “Sécurité Sociale” (health insurance).

For full consideration, applicants are asked to submit:
 - a curriculum vitae (including research experience, publications and 
conferences, and computing skills);
 - an application letter including a detailed statement of research interests;
 - contact information for 2 referees.

Applications should be sent by email before 31 May 2020 to Please note that attachments larger than ~5 Mo are not 
supported by our e-mail server.

For more details about this call, please contact:
Romain Roehrig
42 avenue G. Coriolis, 
31057 Toulouse cedex 1
Tel: +33 (0)5 61 07 97 62
Fax: +33 (0)5 61 07 96 10


Coppin, D., and S. Bony, 2018: On the interplay between convective aggregation, 
surface temperature gradients, and climate sensitivity. Journal of Advances in 
Modeling Earth Systems, 10, 3123-3138, doi: 10.1029/2018MS001406. 
Holloway C. E., A. A. Wing, S. Bony, C. Muller, H. Masunaga, T. S. L’Ecuyer, D. 
D. Turner and P. Zuidema, 2017: Observing convective aggregation. Survey in 
Geophysics, 38, 1199-1236, doi: 10.1007/s10712- 017-9419-1. 
Jakob, C., M. S. Singh, and L. Jungandreas, 2019: Radiative convective 
equilibrium and organized convection: An observational perspective. Journal of 
Geophysical Research: Atmospheres, 124, 5418-5430, doi: 10.1029/2018JD030092.
Roehrig, R., I. Beau, D. Saint-Martin, A. Alias, B. Decharme, J.-F. Guérémy, A. 
Voldoire, A. Y. Abdel-Lathif, E. Bazile, S. Belamari, S. Blein, D. Bouniol, Y. 
Bouteloup, J. Cattiaux, F. Chauvin, M. Chevallier, J. Colin, H. Douville, P. 
Marquet, M. Michou, P. Nabat, T. Oudar, P. Peyrillé, J.-M. Piriou, D. Salas y 
Mélia, R. Séférian and S. Sénési, 2020: The CNRM global atmosphere model 
ARPEGE-Climat 6.3: description and evaluation. Journal of Advances in Modeling 
Earth Systems (In revision).
Voldoire, A., D. Saint-Martin, S. Sénési, B. Decharme, A. Alias, M. Chevallier, 
J. Colin, J.-F. Guérémy, M. Michou, M. P. Moine, P. Nabat, R. Roehrig, D. Salas 
y Mélia, R. Séférian, S. Valcke, I. Beau, S. Belamari, S. Berthet, C. Cassou, 
J. Cattiaux, J. Deshayes, H. Douville, C. Ethé, L. Franchistéguy, O. Geoffroy, 
C. Lévy, G. Madec, Y. Meurdesoif, R. Msadek, A. Ribes, E. Sanchez-Gomez, L. 
Terray, and R. Waldman, 2019: Evaluation of CMIP6 DECK experiments with 
CNRM-CM6-1. Journal of Advances in Modeling Earth Systems, 11, 2177- 2213, doi: 
Wing, A. A., K. A. Reed, M. Satoh, B. Stevens, S. Bony, and T. Ohno, 2018: 
Radiative-convective equilibrium model intercomparison project. Geoscientific 
Model Development, 11, 793-813, doi: 10.5194/ gmd-11-793-2018. 
Wing, A. A., 2019: Self-Aggregation of Deep Convection and its Implications for 
Climate. Current Climate Change Reports, 5, 1-11, doi: 

Romain ROEHRIG Phone: +33(0)5 61 07 97 62 
METEO-FRANCE Fax: +33(0)5 61 07 96 10 
42, Avenue G. Coriolis 

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