ORGANISATION/COMPANYUniversité Pierre et Marie Curie/Paris 6
RESEARCH FIELDEnvironmental science › Global changeGeosciences › OtherHistory › Medieval history
RESEARCHER PROFILEFirst Stage Researcher (R1)
APPLICATION DEADLINE25/08/2021 23:00 - Europe/Athens
LOCATIONFrance › Paris
TYPE OF CONTRACTTemporary
HOURS PER WEEK40
OFFER STARTING DATE01/11/2021
This post-doc project aims to investigate how post-depositional processes modify the geochemical signatures of ancient charcoals and consequently, δ13C-based climate reconstruction. The work is part of a larger project focused on Medieval Climatic Optimum, socio-economic development and its forestry consequences. This project relies on an interdisciplinary collaboration between dendro-anthracologists, palynologists, biogeochemists, soil scientists, and historians. This project is funded by the Domaine d’intérêt majeur Matériaux anciens et patrimoniaux in the framework of the DIM-MAP call for post-doctoral funding.
PROJECT AIMS AND JOB PROFILE
Produced by the use of wood as fuel or during forest fires, charcoals are ubiquitous in soils and sediments. Persisting in soil and sediments over millennia, ancient charcoals offer then a unique window to reconstruct palaeoclimate changes provided carbonisation and post-depositional processes do not bias the use of their stable carbon isotope composition (δ13C) as a climate proxy. The objectives of this project are (i) to assess the effects of fire and of post-depositional processes on the geochemistry of woods and (ii) to apply these insights to reconstruct past climate modifications determining the δ13C isotopic composition in archaeological charred woods. To this end, the project is composed of three parts. The first part will aim to understand how the heterogeneity of carbonization impacts the initial chemical properties of wood, in particular its δ13C isotopic composition. Different taxa often found in archaeological contexts will then be charred experimentally at different temperatures. Combination of Rock-Eval thermal analysis, Raman spectroscopy, infrared spectroscopy and gas chromatography coupled with an isotope ratio mass spectrometer (GC-irMS) will be used to determine the geochemical and δ13C isotopic compositions of studied woods. The second part of the project will aim to investigate how post-depositional processes modifies our perception of (i) the carbonization undergone by charred wood and of (ii) climate proxies. This will be achieved through the incubation of charcoals into soil. The geochemical properties of charcoals will be investigated following the procedure defined in the first part of the project. Finally, the third part of this project will consist in reconsidering δ13C-based climate reconstruction according to the application of previous key insights on archaeological charred woods.
Contract duration: 12 months
The post-doctoral candidate will be hosted in METIS and will work with AASPE and MONARIS Research Units. Several missions in Nancy (LEMTA) are scheduled.
Worktime percentage: Full time
Qualification required: PhD (Postdoc experience < 2 years)
Starting date : November 2021
Deadline for application (CV (including the list of publications) + application letter + thesis reports): August 25th, 2021
Interviews: Early september
Required Research Experiences
RESEARCH FIELDGeosciences › Other
YEARS OF RESEARCH EXPERIENCE1 - 4
RESEARCH FIELDHistory › Medieval history
YEARS OF RESEARCH EXPERIENCE1 - 4
REQUIRED EDUCATION LEVELEnvironmental science: PhD or equivalentGeosciences: PhD or equivalentHistory: PhD or equivalent
The candidate should be trained in Earth Sciences, with a strong taste for biogeochemistry and lab work. Knowledge and/or interest for archaeology, dendrology, geology or soil science would be highly appreciated.
Interdisciplinarity: work between different laboratories.
Project in relation with the progress of the restoration work of the cathedral.
Work in clean labs with strong acids.
EURAXESS offer ID: 666250
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