{"id":{"repo_id":"uwo","oai_identifier":"oai:uwo.scholaris.ca:20.500.14721/30322"},"canonical_url":"https://search.dev.ndltd.org/etd/uwo/oai:uwo.scholaris.ca:20.500.14721/30322","repository":{"repo_id":"uwo","name":"Western University","base_url":"https://uwo.scholaris.ca/server/oai/request"},"display":{"title":"Stable carbon and oxygen isotope investigation of Pleistocene growing-season paleoclimate using tree-ring cellulose from the Missinaibi Formation, Adam Creek, James Bay Lowland, Canada","abstract":"The isotopic compositions of cellulose in tree rings provide a record of seasonal and annual climatic conditions such as precipitation and temperature. We analyzed stable isotopes of carbon (δ13Ccellulose) and oxygen (δ18Ocellulose) in early-wood and late-wood of five conifer sub-fossil wood samples from the Missinaibi Formation, which likely grew during the peak of Marine Isotope Substage (MIS) 5a (~82 kya) at Adam Creek, Ontario. There was no systematic difference between early-wood and late-wood for either δ13Ccellulose or δ18Ocellulose, suggesting similar climatic conditions throughout the growing season. A shift to lower δ13Ccellulose with growth age in most samples indicated rising water availability. The estimated value of δ18Oprecipitation was similar or slightly higher than modern δ18Oprecipitation. Hence, the area may have experienced similar to slightly warmer and/or less humid conditions than today, which is in agreement with the few other studies of MIS 5a climate in this region.","abstract_html":"The isotopic compositions of cellulose in tree rings provide a record of seasonal and annual climatic conditions such as precipitation and temperature. We analyzed stable isotopes of carbon (δ13Ccellulose) and oxygen (δ18Ocellulose) in early-wood and late-wood of five conifer sub-fossil wood samples from the Missinaibi Formation, which likely grew during the peak of Marine Isotope Substage (MIS) 5a (~82 kya) at Adam Creek, Ontario. There was no systematic difference between early-wood and late-wood for either δ13Ccellulose or δ18Ocellulose, suggesting similar climatic conditions throughout the growing season. A shift to lower δ13Ccellulose with growth age in most samples indicated rising water availability. The estimated value of δ18Oprecipitation was similar or slightly higher than modern δ18Oprecipitation. Hence, the area may have experienced similar to slightly warmer and/or less humid conditions than today, which is in agreement with the few other studies of MIS 5a climate in this region.","abstract_has_math":false,"creators":["Lee, Jumin"],"institution":"The University of Western Ontario","degree_name":"M Sc","degree_level":null,"degree_discipline":"Geology","degree_department":null,"school":null,"contributors":[],"advisors":["Longstaffe, Fred J.","Webb, Elizabeth"],"committee_chairs":[],"committee_members":[],"year":2020,"date_issued":"2020-08-24","date_published":"2020-08-24","updated_at":"2026-07-27T21:56:03Z","subjects":["Stable carbon isotopes","Stable oxygen isotopes","Tree rings","James Bay Lowland","Paleoclimate","Missinaibi Formation"],"languages":["en_ca"],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/20.500.14721/30322","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Longstaffe, Fred J.","Webb, Elizabeth"]},{"key":"dc:creator","label":"Author","values":["Lee, Jumin"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2025-07-10T18:39:41Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2025-07-10T18:39:41Z"]},{"key":"dc:date.issued","label":"Date","values":["2020-08-24"]},{"key":"dc:publisher","label":"Institution","values":["The University of Western Ontario"]},{"key":"dc:type","label":"Dc Type","values":["thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Geology"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M Sc"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Stable carbon isotopes","Stable oxygen isotopes","Tree rings","James Bay Lowland","Paleoclimate","Missinaibi Formation"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en_ca"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://hdl.handle.net/20.500.14721/30322"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The thesis cover page in the PDF document includes references to Western University’s previous institutional repository platform, known as Scholarship@Western, and links to that platform (beginning with ir.lib.uwo.ca). In citing or referring to this thesis, use the DOI or handle from this page instead. Sample citation: Author name, \"Thesis title.\" (Year). Western University Open Repository. https://doi.org/10.71858/123456."]},{"key":"dc:description.abstract","label":"Abstract","values":["The isotopic compositions of cellulose in tree rings provide a record of seasonal and annual climatic conditions such as precipitation and temperature. We analyzed stable isotopes of carbon (δ13Ccellulose) and oxygen (δ18Ocellulose) in early-wood and late-wood of five conifer sub-fossil wood samples from the Missinaibi Formation, which likely grew during the peak of Marine Isotope Substage (MIS) 5a (~82 kya) at Adam Creek, Ontario. There was no systematic difference between early-wood and late-wood for either δ13Ccellulose or δ18Ocellulose, suggesting similar climatic conditions throughout the growing season. A shift to lower δ13Ccellulose with growth age in most samples indicated rising water availability. The estimated value of δ18Oprecipitation was similar or slightly higher than modern δ18Oprecipitation. Hence, the area may have experienced similar to slightly warmer and/or less humid conditions than today, which is in agreement with the few other studies of MIS 5a climate in this region."]},{"key":"dc:title","label":"Title","values":["Stable carbon and oxygen isotope investigation of Pleistocene growing-season paleoclimate using tree-ring cellulose from the Missinaibi Formation, Adam Creek, James Bay Lowland, Canada"]}]}],"canonical_facts":{"dc:contributor.advisor":["Longstaffe, Fred J.","Webb, Elizabeth"],"dc:creator":["Lee, Jumin"],"dc:date.accessioned":["2025-07-10T18:39:41Z"],"dc:date.available":["2025-07-10T18:39:41Z"],"dc:date.issued":["2020-08-24"],"dc:description":["The thesis cover page in the PDF document includes references to Western University’s previous institutional repository platform, known as Scholarship@Western, and links to that platform (beginning with ir.lib.uwo.ca). In citing or referring to this thesis, use the DOI or handle from this page instead. Sample citation: Author name, \"Thesis title.\" (Year). Western University Open Repository. https://doi.org/10.71858/123456."],"dc:description.abstract":["The isotopic compositions of cellulose in tree rings provide a record of seasonal and annual climatic conditions such as precipitation and temperature. We analyzed stable isotopes of carbon (δ13Ccellulose) and oxygen (δ18Ocellulose) in early-wood and late-wood of five conifer sub-fossil wood samples from the Missinaibi Formation, which likely grew during the peak of Marine Isotope Substage (MIS) 5a (~82 kya) at Adam Creek, Ontario. There was no systematic difference between early-wood and late-wood for either δ13Ccellulose or δ18Ocellulose, suggesting similar climatic conditions throughout the growing season. A shift to lower δ13Ccellulose with growth age in most samples indicated rising water availability. The estimated value of δ18Oprecipitation was similar or slightly higher than modern δ18Oprecipitation. Hence, the area may have experienced similar to slightly warmer and/or less humid conditions than today, which is in agreement with the few other studies of MIS 5a climate in this region."],"dc:identifier.uri":["https://hdl.handle.net/20.500.14721/30322"],"dc:language.iso":["en_ca"],"dc:publisher":["The University of Western Ontario"],"dc:subject":["Stable carbon isotopes","Stable oxygen isotopes","Tree rings","James Bay Lowland","Paleoclimate","Missinaibi Formation"],"dc:title":["Stable carbon and oxygen isotope investigation of Pleistocene growing-season paleoclimate using tree-ring cellulose from the Missinaibi Formation, Adam Creek, James Bay Lowland, Canada"],"dc:type":["thesis"],"thesis:degree_discipline":["Geology"],"thesis:degree_name":["M Sc"]},"updated_at":"2026-07-27T21:56:03Z"}