Sorry, you need to enable JavaScript to visit this website.

PhD, Permafrost - LSCE, France

PhD, Permafrost - LSCE, France

Gif sur Yvette, France
Theme
Category
Logistics
Permafrost: climate-carbon interactions from the Pleistocene to the
Anthropocene

Main supervisor: Didier Roche
Co-supervisors: Nathaelle Bouttes and Aurélien Quiquet
Contact: nathaelle.bouttes@lsce.ipsl.fr
Location: LSCE, Bat 714, CEA-Orme des Merisiers, 91191 Gif sur Yvette https://www.lsce.ipsl.fr/
Team: CLIM (https://www.lsce.ipsl.fr/Phocea/Vie_des_labos/Ast/ast_groupe.php?id_groupe=7)
Funded by ANR (French research agency)
External collaborators: Antoine Séjourné (GEOPS), Emilie Capron (IGE, Grenoble), Pepijn Bakker
(University of Amsterdam)
Keywords: permafrost, climate, carbon cycle, model, ice sheet
Description
Permafrost - ground frozen for at least 2 consecutive years - covers large areas of high latitudes, particularly in the northern hemisphere. It plays a crucial role in the climate system: exchanges of heat, water and carbon with the atmosphere can alter the carbon cycle and the climate. In particular, the presence of permafrost can strongly modify the local seasonal cycle, which can favour the formation or melting of ice caps during glacial-interglacial cycles. Changes in permafrost extent are also likely to have influenced changes in atmospheric CO2 concentration during glacial-interglacial periods, by storing or releasing carbon as the permafrost advances and retreats. Finally, there are still many uncertainties as to how permafrost will evolve in the future, which could have a lasting impact on the carbon cycle and climate over the next few thousand years.
Tasks
To understand its role in past changes and anticipate its future impacts, it is necessary to simulate permafrost with numerical models interacting with climate and carbon cycle models. To this end, this thesis will focus on coupling a permafrost model (VAMPER) with a coupled climate-ice sheet-carbon model (iLOVECLIM model). Comparison with existing data for the modern period will validate the coupling. Secondly, simulations of permafrost evolution during past periods and comparison with existing data, particularly in terms of extension, will enable the model to be improved. During glacialinterglacial periods, the student will analyse interactions with climate, in order to assess the role of permafrost in the establishment and melting of the Northern Hemisphere ice caps. The student will also add the carbon cycle to the permafrost model to assess its role in past changes in CO2 and atmospheric δ13C, a proxy for constraining carbon exchange. These developments, coupled with comparisons with paleo reconstructions, will help improve the model and ultimately assess the role of permafrost in future CO2 and climate projections.
Requirements
If you want more information don't hesitate to contact Aurelien Quiquet (Aurelien.Quiquet@lsce.ipsl.fr), Didier Roche (didier.roche@lsce.ipsl.fr)
Applications
If you want more information don't hesitate to contact Aurelien Quiquet (Aurelien.Quiquet@lsce.ipsl.fr), Didier Roche (didier.roche@lsce.ipsl.fr)
Application deadline
Further information
If you want more information don't hesitate to contact Aurelien Quiquet (Aurelien.Quiquet@lsce.ipsl.fr), Didier Roche (didier.roche@lsce.ipsl.fr)
Contact email
@email