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Carbon isotopes in peat, DOC, CO2, and CH4 in a Holocene peatland on Dartmoor, southwest England

1999; Geological Society of America; Volume: 27; Issue: 6 Linguagem: Inglês

10.1130/0091-7613(1999)027 2.3.co;2

1943-2682

Dan J. Charman, Ramón Aravena, Charlotte Bryant, D. D. Harkness,

Coastal wetland ecosystem dynamics

Research Article| June 01, 1999 Carbon isotopes in peat, DOC, CO2, and CH4 in a Holocene peatland on Dartmoor, southwest England Dan J. Charman; Dan J. Charman 1Department of Geographical Sciences, University of Plymouth, Plymouth, Devon PL4 8AA, UK Search for other works by this author on: GSW Google Scholar Ramon Aravena; Ramon Aravena 2Department of Earth Sciences, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada Search for other works by this author on: GSW Google Scholar Charlotte L. Bryant; Charlotte L. Bryant 3Natural Environment Research Council Radiocarbon Laboratory, Scottish Enterprise Technology Park, East Kilbride, Glasgow G75 0QF, UK Search for other works by this author on: GSW Google Scholar Doug D. Harkness Doug D. Harkness 3Natural Environment Research Council Radiocarbon Laboratory, Scottish Enterprise Technology Park, East Kilbride, Glasgow G75 0QF, UK Search for other works by this author on: GSW Google Scholar Author and Article Information Dan J. Charman 1Department of Geographical Sciences, University of Plymouth, Plymouth, Devon PL4 8AA, UK Ramon Aravena 2Department of Earth Sciences, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada Charlotte L. Bryant 3Natural Environment Research Council Radiocarbon Laboratory, Scottish Enterprise Technology Park, East Kilbride, Glasgow G75 0QF, UK Doug D. Harkness 3Natural Environment Research Council Radiocarbon Laboratory, Scottish Enterprise Technology Park, East Kilbride, Glasgow G75 0QF, UK Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1999) 27 (6): 539–542. https://doi.org/10.1130/0091-7613(1999)027 2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Dan J. Charman, Ramon Aravena, Charlotte L. Bryant, Doug D. Harkness; Carbon isotopes in peat, DOC, CO2, and CH4 in a Holocene peatland on Dartmoor, southwest England. Geology 1999;; 27 (6): 539–542. doi: https://doi.org/10.1130/0091-7613(1999)027 2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Carbon gases with younger 14C ages than those of the surrounding peat have been reported from continental boreal peatlands, a fact which suggests that significant movement of CO2, CH4, or DOC (dissolved organic carbon) and export of C via subsurface processes are not accounted for in most estimates of contributions to the C cycle. This paper tests the hypothesis that similar processes can occur in oceanic ombrotrophic mires where water and gas movement is theoretically minimal. Measurements of 14C and δ13C in CO2, CH4, and DOC, and of tritium, are reported from depths to 250 cm at Tor Royal, a raised mire in southwest England. Radiocarbon ages of gases are 1460 to 500 yr younger than those of peat from the same depths, and CO2 is consistently younger than CH4. DOC is 1260 to 830 yr younger than the peat, and significant amounts of tritium were found at all depths. Gas ages are mostly intermediate between the age of the peat and that of the DOC, which suggests that C is principally transported as DOC. However, some gases are younger than their associated DOC, which implies that movement of dissolved gases may also take place. δ13C values in gases suggest that CO2 reduction is the major pathway for CH4 production. Transport of C in deep peats is likely to be a significant component in the overall C budget of ombrotrophic oceanic peatlands, and C export via discharge to ground or surface waters may be an important mechanism for gaseous C emissions. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.