Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 9 of 9 for “"Stable oxygen isotopes"”.
-
Assessment of oxygen sources and sinks in the northern Gulf of Mexico using stable oxygen isotopes
… biological and physical processes that control oxygen dynamics. Yet, based on oxygen concentration measurements alone, it is difficult to separate the effects of biological factors from physical factors. To address this problem, I used a dual budget approach to assess the importance of oxygen …
-
Growth Characterization of Mesophotic Rhodoliths in the Northern Gulf of Mexico Using Radiocarbon Dating
… and growth rate assessment techniques such as stable oxygen isotopes profiling or elemental mapping. Therefore, we utilized sequential radiocarbon analysis for growth characterization of mesophotic boxwork rhodoliths. Rhodoliths were collected from the Flower Garden Banks National Marine …
-
Diagenesis of the B chalk, B marl, and Fort Hays member of the Niobrara Formation, Denver Basin, Colorado
… electron microscopy, geothermal data, and stable oxygen isotopes provided insight into the varying diagenetic changes that have occurred. An increase in temperature lead to a decrease in porosity and permeability from greater accumulations of calcite cement through recrystallization and …
-
Stable oxygen isotope variability in seawater: Insights into past and present ocean circulation and hydroclimate
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-02-04 without embargo terms
-
Late Quaternary fire histories in the eastern Mediterranean region from lake sedimentary micro-charcoals
… were compared with existing multi-proxy data (stable oxygen isotopes, pollen and archaeological data). Results show clear links between climate, biomass, people and fire, although these relationships changed over time. Regional fire activity during the Last Glacial: Holocene transition was …
-
LATE QUATERNARY FIRE HISTORIES IN THE EASTERN MEDITERRNEAN REGION FROM LAKE SEDIMENTARY MICRO-CHARCOALS
… were compared with existing multi-proxy data (stable oxygen isotopes, pollen and archaeological data). Results show clear links between climate, biomass, people and fire, although these relationships changed over time. Regional fire activity during the Last Glacial: Holocene transition was …
-
Water balance and productivity of a Mediterranean oak woodland : Quantifying understory vegetation impacts by development of a stable oxygen isotope partitioning approach
… technique were combined with a novel stable oxygen isotope partitioning approach. Stable oxygen isotopes are valuable tracers for water movements within the ecosystem, but due to methodological restrictions in the past, it was necessary to validate modeling approaches and derive field …
-
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
… 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) …
-
Soil geomorphology of the eastern Sevilleta Long Term Ecological Research Site
… soils, only one polygenetic soil demonstrates stable carbon isotope depth trends similar to the diffusion model of Cerling et al. (1989). Low delta 13C carbonate values in the near-surface reflect the introduction of exogenous material. Low delta 13C carbonate values at >50 cm of depth reflect …