Show simple item record

dc.contributor.authorEstop‐Aragonés, C
dc.contributor.authorOlefeldt, D
dc.contributor.authorAbbott, BW
dc.contributor.authorChanton, JP
dc.contributor.authorCzimczik, CI
dc.contributor.authorDean, JF
dc.contributor.authorEgan, JE
dc.contributor.authorGandois, L
dc.contributor.authorGarnett, MH
dc.contributor.authorHartley, IP
dc.contributor.authorHoyt, A
dc.contributor.authorLupascu, M
dc.contributor.authorNatali, SM
dc.contributor.authorO'Donnell, JA
dc.contributor.authorRaymond, PA
dc.contributor.authorTanentzap, AJ
dc.contributor.authorTank, SE
dc.contributor.authorSchuur, EAG
dc.contributor.authorTuretsky, M
dc.contributor.authorAnthony, KW
dc.date.accessioned2020-10-16T15:03:31Z
dc.date.issued2020-09-02
dc.description.abstractThe magnitude of future emissions of greenhouse gases from the northern permafrost region depends crucially on the mineralization of soil organic carbon (SOC) that has accumulated over millennia in these perennially frozen soils. Many recent studies have used radiocarbon (14C) to quantify the release of this “old” SOC as CO2 or CH4 to the atmosphere or as dissolved and particulate organic carbon (DOC and POC) to surface waters. We compiled ~1,900 14C measurements from 51 sites in the northern permafrost region to assess the vulnerability of thawing SOC in tundra, forest, peatland, lake, and river ecosystems. We found that growing season soil 14C‐CO2 emissions generally had a modern (post‐1950s) signature, but that well‐drained, oxic soils had increased CO2 emissions derived from older sources following recent thaw. The age of CO2 and CH4 emitted from lakes depended primarily on the age and quantity of SOC in sediments and on the mode of emission, and indicated substantial losses of previously frozen SOC from actively expanding thermokarst lakes. Increased fluvial export of aged DOC and POC occurred from sites where permafrost thaw caused soil thermal erosion. There was limited evidence supporting release of previously frozen SOC as CO2, CH4, and DOC from thawing peatlands with anoxic soils. This synthesis thus suggests widespread but not universal release of permafrost SOC following thaw. We show that different definitions of “old” sources among studies hamper the comparison of vulnerability of permafrost SOC across ecosystems and disturbances. We also highlight opportunities for future 14C studies in the permafrost region.en_GB
dc.description.sponsorshipNatural Sciences and Engineering Research Council of Canada (NSERC)en_GB
dc.description.sponsorshipCampus Alberta Innovates Program (CAIP)en_GB
dc.description.sponsorshipEuropean Union Horizon 2020en_GB
dc.description.sponsorshipNational Science Foundation (NSF)en_GB
dc.identifier.citationVol. 34 (9), article e2020GB006672en_GB
dc.identifier.doi10.1029/2020gb006672
dc.identifier.grantnumberRGPIN‐2016‐04688en_GB
dc.identifier.grantnumber695101en_GB
dc.identifier.grantnumber1331083en_GB
dc.identifier.grantnumber1931333en_GB
dc.identifier.urihttp://hdl.handle.net/10871/123281
dc.language.isoenen_GB
dc.publisherAmerican Geophysical Union (AGU) / Wileyen_GB
dc.rights.embargoreasonUnder embargo until 2 March 2021en_GB
dc.rights© 2020. American Geophysical Union. All Rights Reserved.en_GB
dc.subjectpermafrost thawen_GB
dc.subjectradiocarbonen_GB
dc.subjectcarbon dioxideen_GB
dc.subjectmethaneen_GB
dc.subjectdissolved organic carbonen_GB
dc.subjectparticulate organic carbonen_GB
dc.titleAssessing the Potential for Mobilization of Old Soil Carbon After Permafrost Thaw: A Synthesis of 14 C Measurements From the Northern Permafrost Regionen_GB
dc.typeArticleen_GB
dc.date.available2020-10-16T15:03:31Z
dc.identifier.issn0886-6236
dc.descriptionThis is the final version. Available from the American Geophysical Union via the DOI in this recorden_GB
dc.identifier.journalGlobal Biogeochemical Cyclesen_GB
dc.rights.urihttp://www.rioxx.net/licenses/all-rights-reserveden_GB
dcterms.dateAccepted2020-08-30
exeter.funder::DECCen_GB
exeter.funder::Natural Environment Research Council (NERC)en_GB
rioxxterms.versionVoRen_GB
rioxxterms.licenseref.startdate2020-09-02
rioxxterms.typeJournal Article/Reviewen_GB
refterms.dateFCD2020-10-16T15:00:00Z
refterms.versionFCDVoR
refterms.panelCen_GB


Files in this item

This item appears in the following Collection(s)

Show simple item record