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Impacts of PermaFROST degradation on peatLAND biogeochemistry

Description du projet

Effet de la fonte du pergélisol sur les tourbières subarctiques et arctiques

Près de la moitié du carbone organique (C) des sols de la planète est stocké dans le pergélisol, principalement dans la tourbe gelée en permanence. La fonte du pergélisol est particulièrement préoccupante car elle pourrait transformer les tourbières, les faisant passer de puits de carbone à sources de carbone, ce qui provoquerait une accélération du changement climatique. Cependant, le couplage entre les cycles du carbone et des nutriments est encore mal compris. Le projet FROSTLAND, financé par l’UE, comblera cette lacune en expliquant les changements biogéochimiques à petite échelle survenant dans la couche active et dans le pergélisol profond à travers les gradients de dégel du pergélisol dans les tourbières subarctiques et arctiques. L’objectif est d’améliorer les estimations à petite et grande échelle de la disponibilité des nutriments et des stocks de carbone et de nutriments dans différents scénarios de réchauffement climatique.

Objectif

The degradation of permafrost has accelerated in subarctic and arctic regions. The southern boundary of permafrost distribution
has receded northwards over the last decades, and the degradation has also increased in the arctic zone of
continuous permafrost. This process is expected to persist in the future due to climate warming, which is amplified in circumpolar regions. Almost half of the world’s soil organic C is stored in permafrost, largely in permanently frozen peat. The degradation of permafrost in peatlands is particularly threatening because it may turn peatlands from C sinks to C sources and accelerate climate change. However, the coupling between C and nutrient cycles is still poorly understood, and needs to be addressed to properly understand the impacts of permafrost thawing on the functioning of peatland ecosystems and their feedback on global climate. FROSTLAND addresses some of these uncertainties. The overall aims are to elucidate the fine-scale biogeochemical changes occurring in the active layer and in deep permafrost across gradients of permafrost thaw in subarctic and arctic peatlands and to improve fine- and broader-scale estimates of nutrient availability and of C and nutrient stocks in different global warming scenarios. FROSTLAND is based on a detailed research plan that has been accurately designed to address these knowledge gaps. The achievement of these objectives will require the acquisition of new knowledge and skills by the researcher, who will be trained at PLECO (UAntwerp) under the supervision of Prof. Janssens, an expert in soil biogeochemistry. A secondment to the Dept. Physical Geography (Stockholm Univ.) will be supervised by Prof. Hugelius, an expert in modelling and upscaling of C and nutrients in permafrost and peatlands. The work will be based on available datasets collected in permafrost peatlands in previous projects and also on new data acquisition. FROSTLAND is an essential step for the researcher's career success.

Coordinateur

UNIVERSITEIT ANTWERPEN
Contribution nette de l'UE
€ 178 320,00
Adresse
PRINSSTRAAT 13
2000 Antwerpen
Belgique

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Région
Vlaams Gewest Prov. Antwerpen Arr. Antwerpen
Type d’activité
Higher or Secondary Education Establishments
Liens
Coût total
€ 178 320,00