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 13 of 13 for “"Water isotopes"”.
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Innovative water tracers and water isotopes enhance Antarctic research with climate models
… studies. Firstly, I developed innovative water tracing diagnostics in an isotope-enabled atmospheric general circulation model ECHAM6-wiso. These water tracers provide new detailed information on moisture sources of atmospheric humidity and precipitation. While previous studies suggested …
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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
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An investigation into using stable water isotopes to determine the dependency of vegetation on groundwater at Cape Point Nature Reserve
We hypothesized that rainwater had a different and distinct isotopic signal to groundwater, and thus plants growing on groundwater-fed areas would have a unique and distinct isotopic composition compared to plants growing on freely-drained soils. We studied two groundwater-fed areas and adjacent …
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Application of Hydrogen and Oxygen Isotope Ratios of Water to the Study of Evaporation, Palaeoclimate, and Ancient Marine Conditions
Triple-oxygen and hydrogen isotopes of water are critical to aid our understanding of the hydrological cycle on the modern and ancient Earth. As such, this thesis presents advancements in techniques and in the understanding of the isotopic behaviour of water that undergoes evaporation in different …
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A comprehensive global 3D model of delta-18O in atmospheric CO2
… where the experimental data are very sparse. The water isotopes of rain are well reproduced but the soil signal is too attenuated in the model. The model further simulates very well the seasonal cycle of atmospheric CO2. For delta-18O(CO2), it precedes the measured cycle by two month. This …
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Geographic Classification of Wines Using Their Elemental and Water Isotopic Composition; Special Emphasis on Washington State, USA
… constant in bottled wine: 58 elements and 2 water isotopes, quantified with Inductively Coupled Plasma Mass Spectrometry (ICP-QQQ) and Cavity Ring-Down Spectroscopy, respectively. Linear discriminant analysis resulted in successful regional and continental classification, with 97.5% and 99.2% …
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An Investigation of the Geochemistry and Hydrogeology of the Queen Charlotte Fault
… P. Tully in 2015 and 2017 identified numerous water column anomalies (i.e seeps), mud volcanoes, microbial mats, and indicators of seabed fluid flow along the QCF. Analyses of pore fluids recovered from the 2017 cruise revealed abundant overprinting signatures of carbonate precipitation, …
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Identifying nitrate transport mechanisms and export dynamics using water age modeling and concentration-discharge relationships
… source of nitrate (NO3-) loss to surface waters. Water flow paths and residence times determine the contact length between NO3- and sub-surface material, controlling the rate of biogeochemical reactions and nitrogen removal via denitrification. A Nitratax N- NO3- sensor was installed at …
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New ice core records from West Antarctica and their spatial context: from 1000 to 100,000 years
… are the focus of this thesis. Chemical and water isotope data from RAID-drilled ice samples are presented for the first time and are comparable to those of conventionally-drilled ice cores. The dataset from SI extends to over 1000 years before present, more than doubling the length of …
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Estimation of groundwater recharge along a precipitation gradient for Savannah aquifers in Namibia with special emphasis on the impact of vegetation
The quantification of groundwater resources is essential especially in water scarce countries like Namibia as well as the assessment of the influence of vegetation on groundwater recharge for a better management and sustainability of savannah aquifers. This study has two specific objectives which …
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The Carbon Budget of the Mekong River Basin: A Spatial and Temporal Study of Chemical Weathering
… data on dissolved riverine sulfate and river water isotopes, $\delta^{18}$$O_{H_2O}$, from one of the world's largest rivers, the Mekong in Southeast Asia, are presented. A new two end member mixing model is used to partition sources of dissolved sulfate. Importantly, sulfate sources cannot be …
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Groundwater of the North-Western Kalahari, Namibia
A quantitative model of groundwater flows contributing to the Goblenz state water scheme at the north-western fringe of the Kalahari was developed within this study. The investigated area corresponds to the Upper Omatako basin and encompasses an outer mountainous rim and sediments of the Kalahari …