Doctoral Candidates in Marine Biogeochemistry
Carl Von Ossietzky University of Oldenburg Institute for Chemistry and Biology
Germany

The Institute for Chemistry and Biology of the Marine Environment (ICBM) at the Carl von Ossietzky University of Oldenburg invites applications for the positions of

3 doctoral candidates (m/w/d) in marine biogeochemistry

(salary according to E13 TV-L, 75%)

The positions are limited to 3.5 years. Start: July 1st, 2021

The ICBM is an interdisciplinary research institute for fundamental and applied marine research. The internationally renowned institute aims at understanding the function of marine environmental systems through close cooperation of the various scientific disciplines (chemistry, biology, physics, mathematical modelling) of its more than 20 research groups.

The PhD positions are part of the research unit DynaDeep (The Dynamic Deep Subsurface of High-Energy Beaches) funded by the German Research Foundation (DFG).

The research unit DynaDeep is a collaborative project that investigates the hydrodynamic and biogeochemical processes in subterranean estuaries. These biogeochemical reactors control the material flow into the sea and exhibit a unique microbial habitat. DynaDeep studies groundwater flow patterns, rates of biotic and abiotic transformation of organic matter and related redox processes and trace metal transformations (for more information see www. uol.de/icbm/verbundprojekte/dynadeep).

The University of Oldenburg is dedicated to increasing the percentage of female employees in the field of science. Therefore, female candidates are strongly encouraged to apply. In accordance to § 21 Section 3 NHG female candidates with equal qualifications will be preferentially considered. Applicants with disabilities will be given preference in case of equal qualification.

2 PhD positions in subproject P3 “Organic matter: Abiotic transformations and microbial interactions”

The research group for Marine Geochemistry (ICBM-MPI Bridging Group) investigates the biogeochemistry of dissolved organic matter (DOM). Main tools are ultrahigh-resolution mass spectrometry (Fourier-transform ion cyclotron resonance mass spectrometry, FT-ICR-MS) and complementary chemical analytical approaches, combined with multivariate statistics and numerical modelling.

The objective of subproject P3 is to study how amplitude and frequency of changes in the deep subsurface affect turnover and molecular transformation of dissolved and sedimentary particular organic matter. We evaluate how alternating redox conditions influence molecular fractionation of organic matter through abiotic and biotic processes.

PhD position 1: DOM in the subterranean estuary: Sources and abiotic processing

The PhD project will study DOM molecular composition in porewaters and sediments of the deep subsurface of the beach on Spiekeroog to identify and trace biogeochemical processes and their spatio-temporal changes in the subterranean estuary. The project will combine field studies with laboratory experiments that will be jointly carried out with other subprojects. The PhD student will work closely together with PhD student 2, who focuses on DOM-microbe dynamics.

Responsibilities of the successful candidate include participation in porewater and sediment sampling campaigns throughout the year and joint laboratory experiments, the processing and analysis of samples for DOM molecular composition, as well as the interpretation of the data in collaboration with other subprojects.

Recruitment requirements include a qualifying academic university degree (M.Sc. or diploma (not of a University of Applied Sciences)) in environmental sciences, analytical chemistry or comparable disciplines. A strong background in organic-geochemical sample processing and analysis, preferably under organic trace clean conditions, and familiarity with mass spectrometry are advantageous. Very good English language skills (written and spoken), the willingness to carry out field work also under harsh conditions and strong interest in collaborative research are required.

In case of questions regarding this job offer, please contact Prof. Dr. Thorsten Dittmar ( ) or Dr. Hannelore Waska ( ). Please send your application including cover letter describing your motivation, curriculum vitae, certificates and contact information of up to three references in a single pdfdocument to Susanne Wendeling ( ) using subject "DynaDeep PhD-1" by May 15, 2021.

PhD position 2: Microbial transformations of DOM in the subterranean estuary

The PhD project will focus on organic matter as essential driver of microbial life in the subterranean estuary. Microbial processing of DOM in this highly dynamic environment will be studied in laboratory experiments and during field campaigns. The PhD student will work closely together with PhD student 1 of this subproject (sources and abiotic processing of DOM) as well as with the PhD student in subproject P5 (microbial communities).

Responsibilities of the successful candidate include the participation in porewater and sediment sampling campaigns throughout the year and joint laboratory experiments, the processing and analysis of samples for characterization of DOM molecular composition, the evaluation of complex DOM data sets in the context of microbial community information provided by subproject P5, as well as the interpretation of the data in collaboration with other subprojects.

Recruitment requirements include a qualifying academic university degree (M.Sc. or diploma (not of a University of Applied Sciences)) in Environmental Sciences, Biogeochemistry or comparable disciplines. Experience in organic-geochemical sample processing and analysis and familiarity with mass spectrometry and liquid chromatography are advantageous. Experience with handling of complex data sets and programming skills in R are desirable, as well as some background in microbial ecology. Very good English language skills (written and spoken), the willingness to carry out field work also under harsh conditions and strong interest in collaborative research are required.

In case of questions regarding this job offer, please contact Dr. Jutta Niggemann ( ). Please send your application including cover letter describing your motivation, curriculum vitae, certificates and contact information of up to three references in a single pdfdocument to Susanne Wendeling ( ) using subject "DynaDeep PhD-2" by May 15, 2021.

1 PhD position in subproject P4: Trace elements and metal isotopes: Transformation and fractionation

The working group Marine Isotope Geochemistry uses stable and radiogenic isotope systems (Si, Fe, Nd, Sr, Pb) to investigate biogeochemical processes, element cycles and inputs to the ocean, and to reconstruct changes in the marine environment during past intervals of climate change.

The PhD project within subproject P4 will focus on trace elements (REE) and metal isotopes (Fe, Mo) to identify and trace biogeochemical processes and their spatio-temporal changes in the subterranean estuary. The project will combine field studies with laboratory experiments that will be jointly carried out with other subprojects. The PhD student will work closely together with a postdoc in P4, who focuses on trace metal dynamics.

Responsibilities of the successful candidate include participation in porewater and sediment sampling campaigns throughout the year and joint laboratory experiments, the processing and analysis of samples for rare earth element concentrations and Fe and Mo isotopes (the latter in collaboration with and at the GEOMAR, Kiel), as well as the interpretation of the data in collaboration with other subprojects.

Recruitment requirements include a qualifying university degree (M.Sc. or diploma (not of a University of Applied Sciences)) in earth sciences, analytical chemistry or a related field. A strong background in inorganic-geochemical sample processing and analysis, preferably in the mass spectrometric analysis of trace elements and metal isotopes are advantageous. Very good English language skills (written and spoken), the willingness to carry out field work also under harsh conditions and strong interest in collaborative research are required.

For any queries regarding this position, contact Prof. Dr. Katharina Pahnke ( ). Please send your application including a cover letter, curriculum vitae, certificates and contact information of up to three references in a singledocument preferably by email to , using subject “DynaDeep” by May 15, 2021.


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