Intitulé de l'offre : Research Engineer in Ocean-Iceberg Numerical Modelling (M/F) (H/F)
Référence : UMR5001-ELSGEN-022
Nombre de Postes : 1
Lieu de travail : ST MARTIN D HERES
Date de publication : lundi 12 février 2024
Type de contrat : CDD Technique/Administratif
Durée du contrat : 24 mois
Date d'embauche prévue : 1 mai 2024
Quotité de travail : Temps complet
Rémunération : Between 2782.84€ and 3142.07€ gross per month
Niveau d'études souhaité : Niveau 8 - (Doctorat)
Expérience souhaitée : Indifférent
BAP : Informatique, Statistiques et Calcul scientifique
Emploi type : Expert-e en calcul scientifique
The objective is to improve the performance of the lagrangian iceberg module implemented in the NEMO ocean model. The successful candidate will contribute to the TRACCS Research Priority Programme and Equipment (https://climeri-france.fr/pepr-traccs/).
The successful candidate will improve the performance of the lagrangian iceberg module currently implemented in NEMO (Marsh et al. 2015, Merino et al. 2016). Two options are currently being considered. The first is to transform NEMO's internal iceberg model into an external iceberg model and to couple it to NEMO via OASIS, as it is done for the sea ice model, in order to make better use of the available HPC resources and to limit the load imbalance phenomenon. The second area of development is more exploratory. It will involve improving CPU and GPU performance by transforming the dynamical core of the iceberg model, which is based on linked lists of structures (icebergs) that vectorize very poorly. These developments will be tested on idealized and then realistic configurations at various spatial resolutions. The technical solutions adopted will then have to be incorporated into the official NEMO distribution. The person recruited will be expected to do a regular technological survey and to write technical documentations of the developments carried out. A significant part of the work will involve participating in TRACCS and IGE activities (meetings, seminars, etc.). Short-term visits to the NEMO development teams in Paris (LOCEAN) and Southampton (NOC, UK) and to the OASIS development team in Toulouse (CERFACS) will be necessary to complete the project.
Selection will be based on the following scientific and technical criteria:
• Proven experience in numerical modelling (preferably NEMO);
• Proven experience in numerical model coupling (preferably with the OASIS-MCT coupler);
• Proven experience in code optimisation on HPC (CPU and GPU);
• Proven experience in Fortran;
• Desired experience in Python preferred;
• Desired experience in MPI;
• Desired experience in digital code version management software (preferably git);
• Interest in polar regions;
• Level of English B2.
The selection committee will take into account the gender balance of the research team.
Contexte de travail
The acceleration of the ice sheet has led to an increase in the flow of icebergs over the last thirty years, which will continue to accelerate in the future. Icebergs have a significant impact on warm water intrusions towards ice shelves and the Southern Ocean in general. When they drift away from their calving locations, icebergs can ground on shoals. This leads to large areas of multi-year sea ice attached to these icebergs, as well as polynyas that can have an impact on the formation of dense water or the melting of ice shelves. Modelling these icebergs is therefore essential for a realistic simulation of the climate in the polar zones. However, the iceberg module is used very little in the CMIP simulations carried out with the NEMO model (https://www.nemo-ocean.eu) because, with the cost of the current iceberg model, it cannot be used for long experiments (climate reconstruction and projections).
The successful candidate will be assigned to the CryoDyn team at the Institut des Géosciences de l'Environnement (IGE), which focuses on ice dynamics and connections with the climate system. This person will be supervised by Pierre Mathiot and Nicolas Jourdain. The work will also be carried out in close collaboration with engineers from the NEMO model development team in France and the UK, as well as with the OASIS development team in Toulouse.
The Institut des Géosciences de l'Environnement is a public research laboratory under the auspices of the CNRS, IRD, Université Grenoble Alpes and Grenoble-INP, working on climate change and the anthropisation of our planet in the polar, mountain and intertropical regions, regions that are particularly sensitive and face major societal challenges. It brings together about 250 people, including 150 permanent members (researchers, teacher-researchers, engineers) and about a hundred contractual agents (doctoral students, postdocs, engineers and technicians). The laboratory also welcomes several dozen trainees and visiting scientists every year. The laboratory is located on two sites on the Grenoble university campus (Glaciology building and OSUG-B - Maison Climat Planète), both within a 5-minute walk of each other. The IGE is one of the main laboratories of the Observatoire des Sciences de l'Univers de Grenoble (OSUG), an INSU federative structure.
This recruitment is part of the TRACCS (Transforming Climate Modelling for Climate Services, https://climeri-france.fr/pepr-traccs/) research programme, which brings together the French climate modelling community. Its activities cover the fundamental understanding of climate change and its impacts, and extend to the development of prototype climate services co-constructed by stakeholders and climate modelling experts. The challenge is to accelerate the development of climate models to meet society's expectations in terms of climate action, particularly in the area of adaptation to future climate change.
Contraintes et risques
Nothing to report