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 13 of 13 for “"Crater Lake"”.
-
Heat transfer in active volcanoes: models of crater lake systems
… in this thesis. A general model of a crater lake system was developed that takes inputs of lake temperature, volume, chemical content, and meteorological conditions, and outputs the mass, energy, and chemical flows to and from the lake. The model was applied to lakes at Poás (Costa …
-
Phylogenetic and physiological characterization of deep-biosphere microorganisms in El’gygytgyn Crater Lake sediments
… microbial communities in the deep subsurface of lake systems and their potentials to adapt to changing environmental conditions is still fragmentary. This doctoral thesis aims to build up a unique data basis for providing the first detailed high-throughput characterization of the deep biosphere …
-
A multi-proxy study of the Kalkkop impact Crater Lake deposits in south-central South Africa: implications for late neogene climate evolution
The Kalkkop Crater Lake deposit formed as a result of a meteorite impact, and is situated ~51 km southwest of Graaff-Reinet in the Southern part of South Africa. The structure is about 650 m wide, and contains 90 m of lake deposits that are mainly carbonate precipitates. A 90 m sediment core from …
-
Petrogenetic Relationship of the Postcaldera Eruptions of Mount Mazama, Crater Lake, Oregon; Evolution of a Sub-volcanic Magma Chamber Following a Large Silicic Eruption
… ~ 7,700 years ago, forming the caldera known as Crater Lake. Within a few hundred years, andesitic eruptions built three distinct volcanic edifices on the floor of Crater Lake; ~ 3000 years later, rhyodacite eruptions formed a dome (Bacon et al., 2002). How magmatic systems evolve following a …
-
Geochemistry of a volcanic hydrothermal system at Mount Spurr, Alaska
… d18O and dD-enriched waters from Crater Lake; 2) low temperature (14-40 degrees C), neutral, bicarbonate and Mg-rich, slightly d18O and dD-enriched peripheral waters from Crater Canyon, Kid Canyon, and South Spurr; and 3) cold (less than 9 degrees C), neutral, sulfate-rich, …
-
Modern Pollen-Vegetation Relationships In Ghana, Tropical West Africa
… interpretations of fossil pollen assemblages. Lake Bosumtwi, Ghana, is a 1 million year old meteorite impact crater-lake, in which pollen has been deposited tracking vegetation change, including the expansion and contraction of grass dominated landscapes evidenced by very high proportions of …
-
The educational program in the national parks with particular reference to those in the western states
… of the following National Parks: Bryce Canyon, Crater Lake, Glacier, Grand Canyon, Lassen Volcanic, Mesa Verde, Mount Rainier, Rocky Mountain, Sequoia, Yellowstone, Yosemite, Zion, and Kings Canyon . In 1935 I visited the Olympic Peninsula, and have been in the region which is now the Olympic …
-
Assessing Holocene and late Pleistocene geomagnetic dipole field variability
… palaeomagnetic records are presented from a maar crater lake in New Zealand and a post-glacial lake in Sweden. The fidelity of the data is evaluated through comparisons with sediment parameters sensitive to environmental change and measurement of cosmogenic radionuclides. The results are used to …
-
Epigenetic variability and inheritance in East African cichlid fishes
… forming part of the radiation of East African Lakes show a remarkable diversity of phenotypic and ecological adaptation. Despite this, recent studies highlighted that genetic diversity within the radiation is among the lowest ever observed in vertebrates. Such a high phenotype/genotype …
-
An ecological study of the insects of Crater Creek, Colorado
Text from page 2: The observations and collections described in this paper were made during the summers of 1914 and 1915, while at the Mountain Biological Laboratory of the University of Colorado, at Tolland, Colorado, and the more detailed studies at the Zoological Laboratory of the University of …
-
Living with a changing climate: Holocene climate variability and socio-evolutionary trajectories, central Turkey
… of past climatic and environmental changes from lake sediment cores and synthesise this with archaeological data in order to reconstruct human-climate interactions at the regional scale. Annually laminated sediment data collected from Nar Gölϋ crater-lake and archaeological archives from the same …
-
Investigations on rainfall variability during the late Quaternary based on geochemical analyses of lake sediments from tropical and subtropical southern Africa
… investigations on sediments from two African lakes which have been recording changes in their surrounding environmental and climate conditions since more than 200,000 years. Focus of this work is the time of the last Glacial and the Holocene (the last ~100,000 years before present [in the …
-
Holocene variations in the strength of the Indian Monsoon system
… record from the saline-alkaline Lonar crater lake, central India. My approach relies on analyzing stable carbon and hydrogen isotope ratios from sedimentary lipid biomarkers to track past hydrological changes. In order to evaluate the relationship of the modern ecosystem and hydrology …