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dc.contributor.advisorCobb, Kim
dc.contributor.authorMoerman, Jessica
dc.date.accessioned2015-06-08T18:26:25Z
dc.date.available2015-06-08T18:26:25Z
dc.date.created2015-05
dc.date.issued2015-04-08
dc.date.submittedMay 2015
dc.identifier.urihttp://hdl.handle.net/1853/53523
dc.description.abstractOxygen and hydrogen isotopes (δ18O, δD) are increasingly powerful tools for reconstructing past hydroclimate variability. The utility of δ18O- and δD-based paleoclimate records, however, depends on our understanding of how well these tracers reflect past climate conditions. The dynamics controlling the relationship between climate and water isotope variability are highly complex and often poorly constrained, especially in the tropics, where many key high-resolution paleoclimate records rely on past rainfall isotopes as proxies for hydroclimate. In this dissertation, I use multi-year timeseries of daily rainfall and biweekly dripwater δ18O from northern Borneo – a site for stalagmite δ18O-based paleoclimate reconstruction in the heart of the West Pacific Warm Pool – to track the cloud-to-calcite transformation of δ18O and its relationship to large-scale climate variability. Chapter 2 investigates the variability of rainfall δ18O variability from northern Borneo on diurnal to interannual timescales and its relationship with local and regional climate. Chapter 3 investigates the rainfall-to-dripwater transformation of climate-related isotopic signals following water transit through the Borneo cave system. Overall, this dissertation provides empirical support for the interpretation of northern Borneo stalagmite δ18O as a robust indicator of regional-scale hydroclimate variability, where higher δ18O reflects regional drying. More generally, this research provides a roadmap for obtaining more nuanced interpretations of speleothem δ18O records from multi-year, high-resolution, paired timeseries of rainfall and dripwater δ18O.
dc.format.mimetypeapplication/pdf
dc.language.isoen_US
dc.publisherGeorgia Institute of Technology
dc.subjectWater isotopes
dc.subjectPaleoclimate
dc.subjectStalagmite
dc.subjectOxygen isotopes
dc.subjectENSO
dc.subjectKarst hydrology
dc.titleRegional hydrology captured in northern Borneo rainwater and dripwater isotope variability
dc.typeDissertation
dc.description.degreePh.D.
dc.contributor.departmentEarth and Atmospheric Sciences
thesis.degree.levelDoctoral
dc.contributor.committeeMemberLynch-Stieglitz, Jean
dc.contributor.committeeMemberReinhardt, Chris
dc.contributor.committeeMemberWebster, Peter
dc.contributor.committeeMemberAdkins, Jess
dc.date.updated2015-06-08T18:26:25Z


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