Activation of old carbon from thawing permafrost in Arctic Siberia (ACTIVE PERMAFROST)


Project leader


Project Details

Start date: 05/01/2014
End date: 05/01/2016
Funding: 206350 EUR


Description

The most important mechanism in the earth system that could move significant quantities of green house gases into theatmosphere within this century is thawing permafrost. The potential for carbon release from thawing permafrost to affectglobal-climate links is realized from the sheer magnitude of the permafrost pools (~2,800 Pg-C) relative to the atmosphericcarbon pools (~760 Pg-C). Recent results from the host research group in Arctic rivers suggest that the organic carbon (OC)released from permafrost may be extensively degraded and converted to green house gases (GHG) in the shelf area, but thefate of the releasing old OC in the Arctic shelf and the possible microbial degradation is still unknown.During this research project the applicant proposes to address this critical knowledge gap by analyzing the composition ofmultiple-proxies, like lipid biomarkers, lignin phenols and CSRA and CSIA analyses of organic carbon in many environmentalcompartments (sediment, SPM and water samples) from two different oceanographic campaigns in the understudied EastSiberian Arctic Shelf (ESAS). CSRA measurements will represent an innovative and powerful approach for determiningsources and sink dynamics of OC in the ESAS. This project also proposes the first CSRA-PLFA study in sediments from theArctic Ocean in order to assess whether microbes are degrading the thawing permafrost. Moreover, CSRA of GHG in theESAS seawater will determine unequivocal data of the outagassing GHG fluxes.

Last updated on 2018-18-12 at 15:38