20 May 2019
20 May 2019
The Holocene Evolution of a Sedimentary Carbon Store in a Mid Latitude Fjord
- 1School of Geography & Sustainable Development, University of St Andrews, St Andrews, 6 KY16 9AL, UK
- 2Department of Geological Sciences, University of Florida, Gainesville, FL 32611, USA
- 3Scottish Association for Marine Science, Scottish Marine Institute, Oban, PA37 1QA, UK
- apresent address: Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA
- bpresent address: School of Geography, Geology and Environment, University of Keele, Staffordshire, ST5 5BG, UK
- 1School of Geography & Sustainable Development, University of St Andrews, St Andrews, 6 KY16 9AL, UK
- 2Department of Geological Sciences, University of Florida, Gainesville, FL 32611, USA
- 3Scottish Association for Marine Science, Scottish Marine Institute, Oban, PA37 1QA, UK
- apresent address: Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA
- bpresent address: School of Geography, Geology and Environment, University of Keele, Staffordshire, ST5 5BG, UK
Abstract. Fjord sediments are recognized as hotspots for the burial and storage of organic carbon, yet little is known about what drives the formation of these coastal carbon stores and how this has altered over time. Here we show that fjords can act as sustained hotspots for carbon burial and storage over Holocene timescales. Further we investigate the role of North Atlantic climate and humans in the evolution of a coastal carbon store using sediment records from a temperate Scottish fjord. Our findings indicate that climate and anthropogenic activity have independently driven increases in terrestrial carbon to the marine environment. When both these drivers were coupled, the terrestrial response was pronounced and the relative proportion of terrestrial OC in the marine sediments increases from 5 % up to 70 %. We hypothesize that sustained human disturbance through the late Holocene sensitized the catchment to abrupt climate reorganizations. The results highlight the importance of fjords for carbon burial and the significance of terrestrial carbon subsidy to the long-term carbon store.
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Craig Smeaton et al.
Interactive discussion


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RC1: 'Review of the manuscript by Smeaton et al.', Anonymous Referee #1, 20 Jun 2019
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RC2: 'Comment on “The Holocene Evolution of a Sedimentary Carbon Store in a Mid Latitude Fjord” by Smeaton et al.', Anonymous Referee #2, 28 Jun 2019
Interactive discussion


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RC1: 'Review of the manuscript by Smeaton et al.', Anonymous Referee #1, 20 Jun 2019
-
RC2: 'Comment on “The Holocene Evolution of a Sedimentary Carbon Store in a Mid Latitude Fjord” by Smeaton et al.', Anonymous Referee #2, 28 Jun 2019
Craig Smeaton et al.
Craig Smeaton et al.
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