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Job posted by Academic Positions (10/07/2014 16.17)

Postdoc - Remineralization of organic particles in presence of ballast minerals (ROBIN)

We seek a biogeochemist to join a project that draws together field and laboratory controlled experiements aiming to better understand the complex interaction between mineral and sinking organic carbon in the context of the biological carbon pump (BCP).

Description

About the role
We seek a biogeochemist to join a project that draws together field and laboratory controlled experiements aiming to better understand the complex interaction between mineral and sinking organic carbon in the context of the biological carbon pump (BCP).
The BCP is a major term in the global carbon cycle which annually transfers 5-15 GT C yr-1 from the atmosphere to the ocean’s interior in the form of sinking particles with an organic component. As these particles sink they are remineralised with the constituent elements returning to solution. The controls on remineralisation rate of sinking organic matter (OM) is an important issue with far wider implications than achieving greater understanding of a major flux in the global carbon cycle. If a link between OM remineralisation depth and presence of mineral concentration (calcite, opal or dust) exists, we can expect changes in air-sea CO2 partitioning resulting from ocean acidification and/or change in aerosol deposition. It is therefore critical to understand the factors regulating remineralisation depth if one wants to assess how ocean biological processes contribute to regulate the global climate. To date no direct in situ observations of OM remineralisation depth combined with assessment of the of mineral content of sinking particles have been performed.
Two field experiments (Mediterranean Sea and Porucupine Abyssal Plain, North Atlantic) will be undertaken to evaluate the role of ballast minerals in regulating particle decomposition in the mesopelagic zone using pressurized incubation chambers (PArticles Sinking Simulator or PASS system,http://www.com.univ-mrs.fr/LMGEM/sinpas/) and modified sediment traps (Marine snow catcher, lent by the National Oceanography Centre).
The ROBIN project is structured around two objectives: (i) Determine whether organic carbon mineralization rate is a function of mineral to organic carbon ratios in sinking particles and (ii) Assessing whether or not bacteria and/or ectoenzymes are excluded from within mineral associated particles.

About you
Candidates are expected to have experience in carbon biogeochemistry and/or microbial ecology, a PhD in oceanography, a MASTER (or equivalent) in marine or environmental sciences. Previous experience in field experiments and measurments is desirable. You will be expected to publish in the relevant peer reviewed literature and to present your work at international conferences. This is a 1 year Fixed Term Appointment position with the possible extension for the second year, offered on Aix Marseille University terms and conditions in the framework of the OT-Med labex (http://www.otmed.fr).

Nr of positions available : 1

Please note that the full description may be available in the national language since some job boards have their own publication policy. Thank you for your understanding!

Research Fields

Environmental science - Earth science
- Ecology
Biological sciences

Career Stage

Experienced researcher or 4-10 yrs (Post-Doc)

Research Profile

Not defined


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Application Deadline

30/09/2014

Other job details
Logo
Job ID

33941851

Country

FRANCE

Type of Contract

Temporary

Status

Full-time

Street

Europôle Méditerranéen de l'Arbois, Bâtiment Gérard MEGIE, 2ème étage, Avenue Louis PHILIBERT

Company/Institute

LabEx OT-Med

City

AIX EN PROVENCE

Postal Code

13857

Company/Institute
LabEx OT-Med

Other
Europôle Méditerranéen de l'Arbois, Bâtiment Gérard MEGIE, 2ème étage, Avenue Louis PHILIBERT
13857 - AIX EN PROVENCE
FRANCE
email info@academicpositions.euhttp://www.otmed.fr/