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Temperature-controlled organic carbon mineralization in lake sediments
Limnology, Department of Ecology and Evolution, Uppsala University, Norbyvägen 18D, SE-752 36 Uppsala, Sweden. (Climate Impacts Research Centre (CIRC) ; Arcum)ORCID iD: 0000-0002-4949-9792
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2010 (English)In: Nature, ISSN 0028-0836, E-ISSN 1476-4687, Vol. 466, no 7305, p. 478-481Article in journal, Letter (Refereed) Published
Abstract [en]

Peatlands, soils and the ocean floor are well-recognized as sites of organic carbon accumulation and represent important global carbon sinks. Although the annual burial of organic carbon in lakes and reservoirs exceeds that of ocean sediments, these inland waters are components of the global carbon cycle that receive only limited attention. Of the organic carbon that is being deposited onto the sediments, a certain proportion will be mineralized and the remainder will be buried over geological timescales. Here we assess the relationship between sediment organic carbon mineralization and temperature in a cross-system survey of boreal lakes in Sweden, and with input from a compilation of published data from a wide range of lakes that differ with respect to climate, productivity and organic carbon source. We find that the mineralization of organic carbon in lake sediments exhibits a strongly positive relationship with temperature, which suggests that warmer water temperatures lead to more mineralization and less organic carbon burial. Assuming that future organic carbon delivery to the lake sediments will be similar to that under present-day conditions, we estimate that temperature increases following the latest scenarios presented by the Intergovernmental Panel on Climate Change could result in a 4-27 per cent (0.9-6.4 Tg C yr(-1)) decrease in annual organic carbon burial in boreal lakes.

Place, publisher, year, edition, pages
2010. Vol. 466, no 7305, p. 478-481
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Environmental Sciences
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URN: urn:nbn:se:umu:diva-130862DOI: 10.1038/nature09186OAI: oai:DiVA.org:umu-130862DiVA, id: diva2:1070158
Note

628SJTimes Cited:13Cited References Count:35

Available from: 2017-01-31 Created: 2017-01-31 Last updated: 2018-09-06

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Gudasz, Cristian

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