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Seminar

Title : L’eau, la boue, les bulles: Les lacs de l’Arctique comme témoins et acteurs des changements du climat
Name of the speaker : Frédéric Bouchard
Affiliation : GEOPS
Laboratory organizer : LSCE
Date and time : 19-04-2018 11h00
Location : Orme des Merisiers, salle 17C du bâtiment 701
Summary :

Freshwater ecosystems are widespread in permafrost regions and play a crucial role in the development of Northern communities (ex: water resources, hunting and fishing). They can also have a significant impact on global biogeochemical cycles by releasing organic carbon formerly trapped in frozen soil, through greenhouse gas emissions (CO2, CH4). Considering the enormous quantities of carbon stored in permafrost (twice as much as in the atmosphere), Arctic aquatic landscapes can be considered as planetary biogeochemical ‘hotspots’.

The central theme of this talk is to show how Arctic lakes can play a double role - as both witnesses (sentinels) and actors (regulators) of large-scale environmental changes, including climate. A brief overview of recent, ongoing and future projects, based on (paleo)limnology, hydrology and biogeochemistry, will be presented. We will travel from the Hudson Bay shores to the Northern tip of the Canadian Arctic Archipelago, through Bylot Island, the main entrance of the Northwest Passage.

We will conclude with a short introduction to the new project called PEGS - ‘PErmafrost and Greenhouse gas dynamics in Siberia’. Recently selected by the ‘Make Our Planet Great Again’ (MOPGA) initiative, launched in 2017 by the French President, PEGS brings together collaborators from GEOPS, LSCE and other institutions at the international level.

Contact :

juliette.lathiere@lsce.ipsl.fr