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.
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Showing 1 to 16 of 16 for “"Water isotope"”.
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Hydrogen-water isotope exchange in a trickle bed column by process simulation and 3D computational fluid dynamics modelling
… industries and biomedical sciences. Today water treatment systems at nuclear sites remove many contaminating debris isotopes, with the exception of tritium. This is because tritiated waters have traditionally been particularly difficult and expensive to treat while they can spread easily if …
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New ice core records from West Antarctica and their spatial context: from 1000 to 100,000 years
… used a novel drilling technology (Rapid Access Isotope Drill, RAID), on Sherman Island (SI), obtaining ice chippings to a depth of 323 m. The RAID was previously deployed at Little Dome C in the East Antarctic, obtaining samples to 460 m depth. The records from RAID ice chippings and their …
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Precipitation amount, altitude, and moisture trajectory effects on the stable isotopic composition of precipitation in the Galapagos Islands
… how climate processes facilitate stable water isotope variability in precipitation over time and space is critical to interpreting stable isotope-based paleoclimate proxies, particularly in the eastern equatorial Pacific where stable water isotope observations from precipitation (δ18Op …
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An automated and user-friendly optical tweezers for biomolecular investigations
… of DNA overstretch- ing as a function of water isotope type. Single DNA unzipping is also presented as a proof of concept.
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Establishing High-Resolution Hydrogeological, Geochemical and Isotopic Baseline Conditions of the Fresh Water Zone at a Field Research Site Near Brooks, Alberta, Canada
… characterization of dissolved gases in groundwater at the CMC field research site from 25.0 to 106.3 m depths was conducted. Data was collected from a continuously cored 106.3 m deep borehole, a 100.0 m deep Westbay® multi-level system and a 67.1 m deep domestic well. The multi-level well with …
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The potential for using stable isotopes for solving urban geohydrological problems in the Cape Town area
… investigates the potential for using the stable isotopes of hydrogen and oxygen from surface water and shallow aquifer water in solving urban geohydrological problems in the Cape Town metropolitan region. Three different water groups were chosen for detailed analysis, namely groundwater, …
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Utilizing High Temporal Resolution Stable Isotope, Sap-Flux, and Eddy Covariance Measurements to Partition Daily Evapotranspiration in an Oak Woodland
… (ET), fT, is an important indicator of water use efficiency in forests and other ecosystems, and an improved understanding of fT is necessary for refined water resource management. Recent advancements in cavity ringdown spectrometers have made the collection of high temporal resolution …
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Using Nutrients, Sediment, Ions, Isotopes, and Hydrograph Separation to Quantify Conduit-Dominated Recharge Processes in a Trinity Aquifer Site: Cave Without a Name
… streams provide an ideal location for sampling waters transported through a karst system because they integrate basin-wide sources ranging from fast flow in conduits to slow flow through the bedrock matrix. Although numerous studies have monitored cave streams to characterize these process, most …
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Advances in understanding melt-affected firn and ice cores from the polar regions
… reveal heterogeneous features resulting from meltwater infiltration, including unprecedented field observations of internal layering within melt lenses. Percolation-induced stable water isotope changes are confined to melt structures, so that information could be retrieved from unaffected profile …
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Isotope Systematics of Gypsum and its Hydration Water
Triple oxygen and hydrogen isotope analysis of the structurally-bound water in gypsum can provide a direct measure of past hydrologic variability. This thesis presents the development of the water extraction and isotopic measurement procedures, the calculation of the gypsum-water isotope …
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Greenlandic ice archives of North Atlantic Common Era climate
… of nearly 30 annual-resolution Greenland water-isotope records, I isolate coherent signatures of atmospheric circulation variability to reconstruct changes in the North Atlantic eddydriven jet-stream over the last millennium, exposing progressively enhanced variability during the past …
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Identifying control points of excessive nitrate load in a pastoral catchment to support lake management
… continues to challenge sustainable freshwater and lake management. However, managing contaminant export from diffuse agricultural sources is difficult due to the lack of detailed knowledge of specific sources and delivery mechanisms controlling contaminant transport over various spatial …
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Top-down or bottom-up?: Impacts of giraffe browse and water abstraction on two keystone tree species of the Kgalagadi Transfrontier Park
… camelopardalis, (top-down) and anthropogenic water abstraction (bottom-up) on the reproductive output and vegetation structure of Acacia erioloba and Acacia haematoxylon in the Kgalagadi Transfrontier Park. I determine the impact of giraffe on canopy structure and reproductive potential of the …
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Detecting spatial variation in hydrology and carbon export across a lake-rich permafrost landscape, Old Crow Flats, Yukon, Canada
… integrity. Pronounced changes in lake and river water levels and land cover compositions have been observed during recent decades by local community members and in scientific studies. Research presented here focuses on enhancing our understanding of spatial patterns in hydrology and carbon export …
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Energy and Moisture Transport in the Earth Climate System: Mean State and the Perturbation Response
… climate modeling studies that employ numerical water tracers (WTs). Data made available from WTs, which track the movement of water in the aerial hydrological cycle from evaporation to precipitation, are used to analyze the sources and transport of precipitable water in the climate system. The …
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Understanding hydrological processes at different scales through stable water isotopes: a focus on alpine ecosystems
L'abstract è presente nell'allegato / the abstract is in the attachment