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A centennial record...
A centennial record of fluvial organic matter input from the discontinuous permafrost catchment of Lake Torneträsk
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- Vonk, Jorien (author)
- Stockholms universitet,Institutionen för tillämpad miljövetenskap (ITM),Stockholm University
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- Alling, Vanja (author)
- Stockholms universitet,Institutionen för tillämpad miljövetenskap (ITM),Stockholm University
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- Rahm, Lars, 1948- (author)
- Linköpings universitet,Tema vatten i natur och samhälle,Filosofiska fakulteten
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- Mörth, Carl-Magnus (author)
- Stockholms universitet,Institutionen för geologiska vetenskaper,Baltic Nest Institute,Stockholm University
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- Humborg, Christoph (author)
- Stockholms universitet,Institutionen för tillämpad miljövetenskap (ITM),Baltic Nest Institute,Stockholm University
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- Gustafsson, Örjan (author)
- Stockholms universitet,Institutionen för tillämpad miljövetenskap (ITM),Stockholm University
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(creator_code:org_t)
- American Geophysical Union (AGU), 2012
- 2012
- English.
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In: Journal of Geophysical Research. - : American Geophysical Union (AGU). - 0148-0227 .- 2156-2202. ; 117:G03018, s. 1-11
- Related links:
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https://liu.diva-por... (primary) (Raw object)
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Subject headings
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- 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.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Klimatforskning (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Climate Research (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Naturgeografi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Physical Geography (hsv//eng)
Keyword
- n-alkanes
- TOC
- radiocarbon
- d13C
- sediment
- climate warming
- subarctic
Publication and Content Type
- ref (subject category)
- art (subject category)
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