Programme Prioritaire de Recherche Make Our Planet Great Again

PErmafrost and Greenhouse gas dynamics in Siberia

PEGS

Mots-clés : Permafrost; Thermokarst; Greenhouse gases; Lakes; Yakutia; Siberia; Arctic.

Résumé

Permafrost (permanently frozen ground) occupies more than 20 million square kilometres, representing nearly a quarter of the land surface in the northern hemisphere. In the circumpolar regions of the Earth, temperatures have recently risen three to four times as fast as the global average, a trend that is expected to continue during the 21st century. Climate warming results in a series of profound environmental impacts across Arctic regions, including permafrost thawing and erosion and the formation of ‘thermokarst’ lakes. This in turn releases organic carbon (formerly trapped in frozen soils) to the surface and may lead to increasing greenhouse gas (GHG) emissions to the atmosphere, ultimately enhancing warming. The main goal of the PEGS project (PErmafrost and Greenhouse gas dynamics in Siberia) is to quantify fluxes, sources and ages of GHGs (CO2, CH4) emitted from representative thermokarst lakes of Central Yakutia (Siberia) in response to permafrost degradation, at different spatial and temporal scales. It combines multiple tools and techniques and integrates field-based, laboratory and local-scale modelling investigations in order to tackle key questions in Earth System sciences, specifically concerning the Arctic system. The project’s main outcomes include: i) the characterization of GHG fluxes from lakes in central Yakutia, among the highest across the Arctic; ii) a paleo-environmental reconstruction of organic carbon dynamics during the last 14,000 years based on sediment core analysis; iii) the development of an automated mapping approach for quantifying lake surface areas based on machine learning. The main results of the project will help refining Earth system models with real field data.

 

L'auteur de ce résumé est le coordinateur du projet, qui est responsable du contenu de ce résumé. L'ANR décline par conséquent toute responsabilité quant à son contenu.

Informations générales

Acronyme projet : PEGS
Référence projet : 17-MPGA-0014
Région du projet : Île-de-France
Discipline : 3 - STUE
Aide PIA : 499 941 €
Début projet : mars 2018
Fin projet : mars 2023

Coordination du projet : Frédéric BOUCHARD
Email : frederic.m.bouchard@gmail.com

Consortium du projet

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