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dc.contributor.authorMellon, Stefanie A
dc.date.accessioned2018-10-23T14:51:33Z
dc.date.available2018-10-23T14:51:33Z
dc.identifier.urihttp://hdl.handle.net/10222/74718
dc.description.abstractThe carbon isotope signature (δ13C) of atmospheric CO2 has decreased as a direct result of anthropogenic CO2 emissions since the industrial revolution. This climate phenomenon has been termed the 13C Suess effect, and can be used to trace anthropogenic CO2 penetration into the surface ocean. This thesis presents the first long-term δ13C time series from the northwestern shelf region of the North Atlantic recorded in fossil foraminifera from five high-resolution sediment cores. These records reveal a Suess effect signal that emerges in the mid-twentieth century with a magnitude of -0.64±0.32 permil (i.e., 40% of the atmospheric signal) and a δ13C decrease rate of -0.014±0.005 permil/yr (58% of the atmospheric rate), a δ13C decrease unprecedented over the 4000 years sampled by the foraminifera records. The implications of these findings are discussed in the context of air-sea CO2 exchange rates, foraminiferal calcification vital effects, and post-depositional processes in the sediments.en_US
dc.language.isoenen_US
dc.subjectoceanographyen_US
dc.subjectpaleoceanographyen_US
dc.subjectcarbon isotopesen_US
dc.subjectSuess effecten_US
dc.titleInvestigating the 13C Suess effect in the northwestern North Atlanticen_US
dc.date.defence2018-09-24
dc.contributor.departmentDepartment of Oceanographyen_US
dc.contributor.degreeMaster of Scienceen_US
dc.contributor.external-examinerDr. Owen Sherwooden_US
dc.contributor.graduate-coordinatorDr. Markus Kienasten_US
dc.contributor.thesis-readerDr. Stephanie Kienasten_US
dc.contributor.thesis-readerDr. Helmuth Thomasen_US
dc.contributor.thesis-supervisorDr. Markus Kienasten_US
dc.contributor.ethics-approvalNot Applicableen_US
dc.contributor.manuscriptsNot Applicableen_US
dc.contributor.copyright-releaseYesen_US
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