Phd Overflows In The North-Atlantic Entrainment as a Shortcut For The Anthropogenic Signal To The Deep-Ocean M - F H/F Ifremer
Plouzané - 29 CDD- 2 300 € / mois
- 🏠 Télétravail occasionnel
- 🕑 3 ans
- Bac +5
- Secteur Energie • Environnement
- Exp. - 1 an
Les missions du poste
Closure date for receipt of applications : 18/04/2025
Who are we?
The Laboratory of Physical and Spatial Oceanography (LOPS, www.umr-lops.fr) is a joint research unit affiliated to Ifremer, and to other three French research and higher education institutions : the French National Centre for Scientific Research (CNRS, www.cnrs.fr), the French National Research Institute for Sustainable Development (IRD, www.ird.fr) and the University of Bretagne Occidentale (UBO, www.univ-brest.fr). The LOPS is one of the seven labs that make up Institut Universitaire Européen de la Mer (IUEM, www-iuem.univ-brest.fr), and one of the three labs of the Océanographie et Dynamique des Ecosystèmes department at Ifremer. Research at LOPS is organized into 4 teams, working on the coastal ocean, the oceans and climate, satellite remote sensing and air-sea interface dynamics and ocean spatio-temporal scale interactions. The lab maintains and develops a unique know-how in oceanographic measurements at SEA, and the interpretation of satellite remote sensing data.
Within LOPS, the Ocean and Climate (CLI) group has as main objectives : to diagnose the baseline, variability and trends in the state of the ocean (ocean circulation, water mass properties); to improve understanding of the mechanisms of internal, forced and coupled variability of the ocean-atmosphere-sea ice system; to improve understanding of the processes and their representation in ocean models; and to estimate the role of physical ocean variability on biogeochemical cycles. In order to achieve these objectives, the CLI group relies on in situ and satellite ocean observations, forced and coupled ocean numerical simulations and simplified models. In particular, the CLI group contributes to systematic observation systems (Argo, Deep-Argo, SST, SSS, GOSHIP) in all aspects : funding, organization, deployment, validation, synthesis and analysis. Supported by the technical team (TOIS), the CLI group has carried out numerous oceanographic campaigns, particularly in the North Atlantic.
The LOPS CLI group is currently (as at 01/01/2025) made up of 57 staff, including 24 researchers and 11 permanent technical engineers from the various LOPS supervisory bodies, as well as 17 doctoral students and 5 post-docs/CDDs. The successful candidate will BE part of this research group as a PhD student, under the scientific guidance of his/her PhD supervisors, and reporting to the CLI manager.
What is the subject of the thesis ?
The global ocean has uptaken one-quarter of the CO2 emitted to the atmosphere since the 1750's (anthropogenic CO2, Cant). The North Atlantic (NA) plays a major role as a Cant sink, primarily linked to the Atlantic Meridional Overturning (AMOC) and deep-water mass formation at high latitudes. However, the comprehensive view of mechanisms driving the variability of the Cant storage at depth in this climate-critical region remains largely unresolved. To address this, your mission in the context of the ENTRAIN project will BE to quantify the surface-to-depth Cant transfer by the three NA overflow water masses that feed the intermediate and deep layers of the Atlantic Ocean : the Denmark Strait Overflow Water (DSOW) and Iceland-Scotland Overflow Water (ISOW), of Arctic origin, and the Mediterranean Water (MW), of Mediterranean origin. During the overflow process across the sills (Greenland-Scotland Ridge and Gibraltar Strait), the dense (Arctic and Mediterranean) overflow source waters experience significant entrainment of relatively Cant-loaded ambient Atlantic' waters leading to the formation of DSOW, ISOW and MW. This entrainment mechanism, which creates regional overturn cells', is often (mis)represented in global circulation models. However, IT might actually represent a non-negligible pathway for the rapid-transfer' of the anthropogenic imprint, bypassing the more commonly acknowledged upper-to-lower AMOC limb Cant transport via deep winter convection. ENTRAIN will leverage the extensive in-situ Argo network, supplemented by cruise-based hydrographic observations, to quantify the biogeochemical imprint of entrainment at the three primary overflow sites and create a detailed mapping of the preferred pathways for deep Cant advection in the NA.
What will your mission BE?
The deep ocean remains largely unknown. This thesis adresses this research gap by using high-quality in situ observations with unequalled spatio-temporal coverage (e.g., Argo) and novel methods based on AI developed at LOPS in the recent years. The originality of ENTRAIN resides in providing new insights about the ocean's role as a carbon sink at high spatio-temporal scales, with results that could improve model parametrizations or guide policymakers in decarbonization strategies.
What will your activities BE?
- Field work : participation in oceanographic cruises.
- Data analysis and programming : create code to analise and visualise your results
- Training courses : take part of formation courses.
- Conferences : present your work at national/international conferences/workshops.
- Research stays : 3-6 month stays in other research institutions in France and/or abroad.
Key words
Anthropogenic carbon, entrainment, nutrients, overflow waters, overturning circulation (AMOC), oxygen
How are your activities organised?
- Embarkation : yes
- Rate of activity : full-time job (7.5h/day, 5 days/week)
- Geographical scope : North Atlantic ocean
- Possible travelling : yes
- Teleworking : yes
L'adresse du poste
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Le profil recherché
Who are you?
- Master 2 (or equivalent) in physical or biogeochemical oceanography, meteorology, climate science, or geophysical fluid dynamics.
You have the following skills, knowledge and experience :
- Experience in the field of physics, the use of large databases and methodologies linked to ocean circulation and water mass transformation.
- Background in biogeochemistry and (or) experience in ocean numerical modelling (ideal but not mandatory).
- Good oral and written communication skills in English.
- Foundation in programming (e.g., Python, MATLAB, etc.).
You have the following qualities :
- Ability to work effectively as part of a team and collaborate with colleagues.
- Strong organizational skills and dynamism.
- Commitment to rigor in applying the scientific method and maintaining a professional work environment.
- Curious and proactive mindset.
Bienvenue chez Ifremer
Join Ifremer, an ally of planetary well-being, to gain a better understanding of and better protection for the ocean.
From the abyss to the surface, from the coast to the open SEA, Ifremer is the French research institute that is wholly dedicated to the Ocean. Its teams carry out research, innovate and produce expert reports to protect the ocean, exploit its resources in a responsible manner and shares marine data.
Ifremer contributes its scientific expertise to throw light on public policies and develops solutions drawn from the ocean to meet the challenges of the ecological transition. Ifremer is the operator of France's oceanographic fleet with its shipbuilding subsidiary Genavir, and imagines, designs and deploys leading edge technological means to solve the ocean's mysteries.
Join our teams, made up of 1500 scientists and research support staff, present all along the coastal areas of France and French overseas territories.
www.ifremer.fr
Infos complémentaires
What are your benefits?
- Phd is a real opportunity to work on Ifremer's scientific and technological priority themes. IT entitle the holder to a gross monthly salary of 2300 Euros gross for a period of 3 years, which cannot BE combined with other scholarships.
- We have a teleworking agreement and our staff have 12 comp time days and supra statutory leave.
- We allocate a significant budget to developing skills, through individual or collective training actions.
- We have a CSR policy inspired by the purposes of the institute (sustainable mobility allowance, etc.)
How to apply for this position?
Please submit your application via the doctoral school portal (Amethis) :
https://amethis.doctorat.org/amethis-client/prd/consulter/offre/997
If you have already applied on Amethis, you do not need to renew your application on this site.
Your application file must include (into separate PDF files, up to 2 Mo for each file) :
- A curriculum vitae
- A covering letter
- A reference letter
- An academic transcript (Bachelor + Master 1 and first semester Master 2)
The deadline for applications is April 18th, 2025.
Doctoral students' contracts will start as of October 6th, 2025, subject to the submission of administrative documents authorizing Ifremer to recruit the doctoral student (certificate of completion of the Master 2 or engineering degree + visa for foreign doctoral students outside the EU).
What are the next steps?
- File review
- Pre-qualification interview
- Application deadline : 18 April 2025.
- Candidate Interview : 16-20 June 2025.
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