Blaize Denfeld

Climate impact on sources and sinks of greenhouse gases in high-latitude lakes

Törnetrask in the Autumn (as viewed from the Abisko Scientific Research Station)

Törnetrask in the Autumn (as viewed from the Abisko Scientific Research Station)

Climate impact on sources and sinks of greenhouse gases in high-latitude lakes

Project Summary

Arctic and subarctic lakes play an important role in the global carbon (C) cycle by burying C in sediments and emitting greenhouse gases as carbon dioxide and methane to the atmosphere. The relative magnitude of these different pathways has large implications for their role in the C cycle, i.e. to what extent they act as C sources or sinks. Still, the knowledge of C cycling in lakes is in many important aspects incomplete, preventing accurate quantification and predictions of their C source-sink function and response to climate change. The aim of the project is to assess climate impacts on C emission and burial in arctic–subarctic lakes. We will specifically investigate direct impacts by temperature and precipitation, and indirect impacts via changes in terrestrial surroundings, and how these various drivers influence the C source-sink function of lakes depending on the rate and magnitude of change. An important part is to assess the various sources and pathways underpinning emission and burial in lakes. The core of the project is made up of (i) comparative studies of lakes across gradients in temperature and precipitation and (ii) large-scale experimental test of responses in C emission and burial to increases in temperature and precipitation/runoff.

Project Dates: 2017-2020

Funding Organization

The Swedish Research Council (VR)

Collaborators

Jan Karlsson, Umeå University
David Bastviken, Linköpings University
Blaize Denfeld, Umeå University (Post Doctoral Researcher)
Cristian Gudasz, Umeå University
Sally MacIntyre, University of California Santa Barbara, USA
Oleg S. Pokrovsky, University Toulouse, France
Chris Soulsby, University of Aberdeen, UK
Bror Holmgren, Umeå University (PhD Student)

 

Climate impact on the carbon emission and export from Siberian inland waters

Arctic Lake Jan Karlsson.jpg

Climate impact on the carbon emission and export from Siberian inland waters

Project Summary

Siberia contains vast carbon (C) stocks potentially vulnerable to mobilization following permafrost thawing, and inland waters draining these regions are largely understudied. Thus, research on inland waters of Siberia is of particular importance for understanding climate change. This interdisciplinary project link expertise in aquatic biogeochemistry, hydrology and permafrost dynamics with the aim to improve the knowledge of the role of high latitude inland waters in emitting C to atmosphere and in exporting C to downstream coastal regions and how this varies between different climate regimes. We will carry out a comparative study of lake-stream networks across a climate gradient in western Siberia covering a large range of permafrost conditions. We will quantify to what extent terrestrial C export is evaded vs. exported downstream in the river networks along the gradient, and how these fluxes are related to differences in hydrological dynamics. This is a JPI Climate collaborative research project on Russian Arctic and Boreal systems (www.jpi-climate.eu/projects).

Project Dates: 2014-2017

Funding Organizations

The Swedish Research Council (VR)
The Natural Environment Research Council (NERC, UK)

Collaborators

Sergey Kirpotin, Tomsk University, Russia
Hjalmar Laudon, Swedish University of Agricultural Sciences, Umeå
Oleg Pokrovsky, University Toulouse, France
Doerthe Tetzlaff, University of Aberdeen, UK
Chris Soulsby, University of Aberdeen, UK
Pertti Ala-Aho, University of Aberdeen, UK (Post doc)
Svetlana Serikova, Umeå University (PhD student)