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A centennial record of fluvial organic matter input from the discontinuous permafrost catchment of Lake Torneträsk
Stockholm University.
Stockholm University.
Linköping University, The Tema Institute, Department of Water and Environmental Studies. Linköping University, Faculty of Arts and Sciences.
Stockholm University.
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2012 (English)In: Journal of Geophysical Research, ISSN 0148-0227, E-ISSN 2156-2202, Vol. 117, no G03018, 1-11 p.Article in journal (Refereed) Published
Abstract [en]

High-latitude regions are underlain by the most organic carbon (OC)-rich soils on earth and currently subject to intense climate warming, potentially increasing remobilization and mineralization of soil OC. Sub-Arctic Scandinavia is located on the 0°C mean annual isotherm and is therefore particularly vulnerable to climate change. This study aimed to establish a baseline for soil OC release over the past century into Lake Torneträsk, the largest lake in sub-Arctic Scandinavia, through bulk geochemical and molecular radiocarbon analyses in chronologically constrained sediment cores. Our results suggest a dominance of peat-derived terrestrial OC inflow. We show that the annual terrestrial OC inflow to the lake is ∼12 times higher than the in-lake produced particulate OC, and consists for a large part (ca. 60%) of old OC from deep reservoirs in the catchment. The sedimentary record shows signs of increasing inflow of more degraded terrestrial matter since ∼1975, as indicated by increasing %TOC concentrations, a lower δ13C value and lower TOC:TN ratios. Based on simultaneous changes in local climate and reported signs of permafrost degradation (e.g., active layer deepening, mire/peat erosion), the observed changes in the sedimentary record of Scandinavia's largest mountain lake likely reflect a climate warming-induced change in terrestrial OC inflow.  

Place, publisher, year, edition, pages
American Geophysical Union (AGU), 2012. Vol. 117, no G03018, 1-11 p.
Keyword [en]
n-alkanes, TOC, radiocarbon, d13C, sediment, climate warming, subarctic
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:liu:diva-79924DOI: 10.1029/2011JG001887ISI: 000307462800002OAI: oai:DiVA.org:liu-79924DiVA: diva2:544649
Funder
Swedish Research Council, 621-2004-4039 and 629-2002-Knut and Alice Wallenberg Foundation
Available from: 2012-08-15 Created: 2012-08-15 Last updated: 2017-12-07

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Rahm, Lars

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