{"id":{"repo_id":"buffalo","oai_identifier":"oai:ubir.buffalo.edu:10477/86734"},"canonical_url":"https://search.dev.ndltd.org/etd/buffalo/oai:ubir.buffalo.edu:10477/86734","repository":{"repo_id":"buffalo","name":"Buffalo","base_url":"https://ubir.buffalo.edu/oai/request"},"display":{"title":"Increase in Northern Arctic Moisture in Winter Precipitation on Southwestern Greenland Through the Holocene","abstract":"M.S.","abstract_html":"M.S.","abstract_has_math":false,"creators":["Grogan, Amy; 0000-0001-5440-2337"],"institution":"State University of New York at Buffalo","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Thomas, Elizabeth","Geology"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2025,"date_issued":"2025-02-21T21:44:33Z","date_published":"2025-02-21T21:44:33Z","updated_at":"2026-07-27T19:05:34Z","subjects":["paleoclimate science","geochemistry"],"languages":["eng"],"rights":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/10477/86734","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Thomas, Elizabeth","Geology"]},{"key":"dc:creator","label":"Author","values":["Grogan, Amy; 0000-0001-5440-2337"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2025-02-21T21:44:33Z","2020"]},{"key":"dc:publisher","label":"Institution","values":["State University of New York at Buffalo"]},{"key":"dc:type","label":"Dc Type","values":["Text","Thesis"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["paleoclimate science","geochemistry"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/10477/86734"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["M.S.","Areas of high latitude, such as Greenland, are expected to experience some of the most dramatic changes in climate during this century. Future projections describe an increase in precipitation in the Arctic, from both increased moisture transport from lower latitudes, and an increase in local evaporation. However, limited modern observational data, especially for precipitation, makes modeling future climate for this region difficult. Climate change during warm periods, such as the mid-Holocene can provide an analog for future changes. Here, we reconstruct precipitation seasonality from 10 ka to present in southwestern Greenland by analyzing the stable hydrogen isotopes of leaf waxes (δ2Hwax) within sediment cores from Lake Marshall (64.463°N, 49.431°W) and Bullet Lake (63.9816°N, 49.5365°W). These two lakes are both through-flowing, but have contrasting residence times, meaning that aquatic plant δ2Hwax measured in Lake Marshall reflects mean annual precipitation δ2H, and aquatic plant δ2Hwax measured in Bullet Lake reflects summer precipitation δ2H. We find a nearly a 100‰ decrease in the δ2H value of C22 n-alkanoic acids, derived from aquatic plants, in Lake Marshall between 7 and 4 ka and remains 2H-depleted thereafter, whereas C22 n-alkanoic acids in Bullet Lake remain constant throughout the Holocene. We interpret the 2H-depletion in Lake Marshall to indicate a change in winter precipitation source caused by the retreat of winter sea ice northward out of Baffin Bay and the Canadian Archipelago, which would have caused an increase in winter evaporation from these ice-free seas and an increase in moisture from farther north carried to southwestern Greenland. The relatively constant δ2H of C22 n-alkanoic acids in Bullet Lake suggests no major change in summer moisture sources during the Holocene. We infer changes in summer relative humidity by comparing C22 and C28 n-alkanoic acids in Bullet Lake, periods of inferred low and high humidity at Bullet Lake are consistent with other humidity and precipitation records in western Greenland. The reconstruction of moisture history of this region will allow for better predictions of changes to precipitation patterns caused by future warming.","**To request an accessible version of the file(s) associated with this item, contact library@buffalo.edu. Please include the item's persistent URL [http://hdl.handle.net/. . .] in your request.**"]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Increase in Northern Arctic Moisture in Winter Precipitation on Southwestern Greenland Through the Holocene"]}]}],"canonical_facts":{"dc:contributor":["Thomas, Elizabeth","Geology"],"dc:creator":["Grogan, Amy; 0000-0001-5440-2337"],"dc:date":["2025-02-21T21:44:33Z","2020"],"dc:description":["M.S.","Areas of high latitude, such as Greenland, are expected to experience some of the most dramatic changes in climate during this century. Future projections describe an increase in precipitation in the Arctic, from both increased moisture transport from lower latitudes, and an increase in local evaporation. However, limited modern observational data, especially for precipitation, makes modeling future climate for this region difficult. Climate change during warm periods, such as the mid-Holocene can provide an analog for future changes. Here, we reconstruct precipitation seasonality from 10 ka to present in southwestern Greenland by analyzing the stable hydrogen isotopes of leaf waxes (δ2Hwax) within sediment cores from Lake Marshall (64.463°N, 49.431°W) and Bullet Lake (63.9816°N, 49.5365°W). These two lakes are both through-flowing, but have contrasting residence times, meaning that aquatic plant δ2Hwax measured in Lake Marshall reflects mean annual precipitation δ2H, and aquatic plant δ2Hwax measured in Bullet Lake reflects summer precipitation δ2H. We find a nearly a 100‰ decrease in the δ2H value of C22 n-alkanoic acids, derived from aquatic plants, in Lake Marshall between 7 and 4 ka and remains 2H-depleted thereafter, whereas C22 n-alkanoic acids in Bullet Lake remain constant throughout the Holocene. We interpret the 2H-depletion in Lake Marshall to indicate a change in winter precipitation source caused by the retreat of winter sea ice northward out of Baffin Bay and the Canadian Archipelago, which would have caused an increase in winter evaporation from these ice-free seas and an increase in moisture from farther north carried to southwestern Greenland. The relatively constant δ2H of C22 n-alkanoic acids in Bullet Lake suggests no major change in summer moisture sources during the Holocene. We infer changes in summer relative humidity by comparing C22 and C28 n-alkanoic acids in Bullet Lake, periods of inferred low and high humidity at Bullet Lake are consistent with other humidity and precipitation records in western Greenland. The reconstruction of moisture history of this region will allow for better predictions of changes to precipitation patterns caused by future warming.","**To request an accessible version of the file(s) associated with this item, contact library@buffalo.edu. Please include the item's persistent URL [http://hdl.handle.net/. . .] in your request.**"],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/10477/86734"],"dc:language":["eng"],"dc:publisher":["State University of New York at Buffalo"],"dc:rights":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."],"dc:subject":["paleoclimate science","geochemistry"],"dc:title":["Increase in Northern Arctic Moisture in Winter Precipitation on Southwestern Greenland Through the Holocene"],"dc:type":["Text","Thesis"]},"updated_at":"2026-07-27T19:05:34Z"}