Temperature controls organic carbon sequestration in a subarctic lake

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http://hdl.handle.net/10138/168558

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Rantala , M V , Luoto , T P & Nevalainen , L 2016 , ' Temperature controls organic carbon sequestration in a subarctic lake ' Scientific Reports , vol. 6 , 34780 . DOI: 10.1038/srep34780

Title: Temperature controls organic carbon sequestration in a subarctic lake
Author: Rantala, Marttiina V.; Luoto, Tomi P.; Nevalainen, Liisa
Contributor: University of Helsinki, Department of Geosciences and Geography
University of Helsinki, En­vir­on­mental Change Research Unit (ECRU)
University of Helsinki, En­vir­on­mental Change Research Unit (ECRU)
Date: 2016-10-06
Language: eng
Number of pages: 11
Belongs to series: Scientific Reports
ISSN: 2045-2322
URI: http://hdl.handle.net/10138/168558
Abstract: Widespread ecological reorganizations and increases in organic carbon (OC) in lakes across the Northern Hemisphere have raised concerns about the impact of the ongoing climate warming on aquatic ecosystems and carbon cycling. We employed diverse biogeochemical techniques on a high-resolution sediment record from a subarctic lake in northern Finland (70 degrees N) to examine the direction, magnitude and mechanism of change in aquatic carbon pools prior to and under the anthropogenic warming. Coupled variation in the elemental and isotopic composition of the sediment and a proxy-based summer air temperature reconstruction tracked changes in aquatic production, depicting a decline during a cool climate interval between similar to 1700-1900 C.E. and a subsequent increase over the 20th century. OC accumulation rates displayed similar coeval variation with temperature, mirroring both changes in aquatic production and terrestrial carbon export. Increase in sediment organic content over the 20th century together with high inferred aquatic UV exposure imply that the 20th century increase in OC accumulation is primarily connected to elevated lake production rather than terrestrial inputs. The changes in the supply of autochthonous energy sources were further reflected higher up the benthic food web, as evidenced by biotic stable isotopic fingerprints.
Subject: NITROGEN DEPOSITION
CLIMATE-CHANGE
NORTHERN FENNOSCANDIA
EASTERN FINLAND
FINNISH LAPLAND
UV EXPOSURE
ICE-AGE
SEDIMENTS
RECONSTRUCTIONS
SENSITIVITY
1172 Environmental sciences
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