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 20 of 39 for “"Paleoclimatology"”.
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Geochemical Approaches to Paleobiology, Paleoclimatology, and Chronostratigraphy of the Cretaceous Cloverly Formation
This dissertation explores the use of geochemical tools to evaluate the timing and nature of biotic and environmental change in the Cloverly Formation. Carbon isotope stratigraphy presented here suggests that the fossiliferous interval of the Cloverly is constrained to mid-late Albian in age, …
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Quantitative palynological analyses of Albian-Cenomanian (Lower to Upper Cretaceous) strata in the Sverdrup Basin: Insights into paleoecology, paleoclimatology and palynostratigraphy
Multivariate statistical analyses of terrestrial palynomorphs from Albian to Cenomanian (Lower to Upper Cretaceous), Sverdrup Basin strata reveal a landscape with wet lowlands inhabited by Pteridophytina and Bryophyta, with cooler, moist uplands inhabited by a variety of conifer plants. A humid and …
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Advances in the reconstruction of temperature history, physiology and paleoenvironmental change : evidence from light stable isotope chemistry
… reports on promising new research avenues for paleoclimatology, paleoecology, and modern ecology.
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Coral skeleton density banding: biotic response to changes in sea surface temperature
… provides a sensitive reconstructive tool for paleoclimatology and paleoecology. However, the detailed biotic mechanisms controlling coral skeleton aragonite nucleation and crystallization events and resulting skeletal growth rate remain uncertain. The coral tissue organic matrix, composed of …
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Exploration of natural climate variability and changes in future events using observations, proxy data and model simulations
… as a geologist and experience in the field of paleoclimatology to meld proxy data (i.e., indirect measurements of past environmental change through archives such as ice, sediments or corals) with large datasets comprised of model simulations. Additionally, I utilize some of the data science and …
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Resolving Terrain Effects in Borehole Temperature Profiles
<p>The study of borehole paleoclimatology aids scientists in determining past climate changes and in understanding current climate trends. Accurate borehole temperature logs are necessary to obtain a useful temperature profile. However, as many climate workers have discovered, borehole temperature …
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Marine iodine biogeochemistry: inorganic speciation, redox dynamics and organic complexation
… industrial processes, organic synthesis, paleoclimatology, atmospheric chemistry and modern climate science. The ocean, as a major surficial iodine reservoir and the primary source of this element to the atmosphere, plays a central role in global iodine cycling. Despite significant …
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thesis in the field of Chemical Oceanography: Marine iodine biogeochemistry: inorganic speciation, redox dynamics and organic complexation
… industrial processes, organic synthesis, paleoclimatology, atmospheric chemistry and modern climate science. The ocean, as a major surficial iodine reservoir and the primary source of this element to the atmosphere, plays a central role in global iodine cycling. Despite significant …
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A magmatic trigger for the Paleocene-Eocene Thermal Maximum?
Fifty-six million years ago Earth experienced rapid global warming (~6°C) that was caused by the release of large amounts of carbon into the ocean-atmosphere system. This Paleocene-Eocene Thermal Maximum (PETM) is often cited as an analogue of anthropogenic climate change. Many trigger mechanisms …
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Boron in Foraminiferal Calcite as an Indicator of Seawater Carbonate Chemistry
Foraminifera are unicellular organisms with a wide marine distribution. Many species secrete carbonate tests whose physical and chemical nature reflect the seawater conditions in which they grow. Thus, fossil tests preserved on the sea floor represent an archive that may be used to investigate the …
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Geochemical tools and paleoclimate clues : multi-molecular and isotopic investigations of tropical marine sediments and alpine ice
South American climate has undergone dramatic changes since the last glacial period, as evidenced from Cariaco Basin (Venezuelan coast) and Peru Margin marine sediment biomarker records. Compounds derived from vascular plant leaf waxes and delivered to the marine sedimentary environment, including …
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Late Quaternary climate variability and terrestrial carbon cycling in tropical South America
Characterizing global and regional climate variability and climate-carbon cycle interactions in the past provides critical context for evaluating present and future climate trends. In this thesis, I use stable isotope and radiocarbon analysis of vascular plant biomarkers in lacustrine and marine …
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Multiproxy Analyses of Past Vegetation, Climate, and Sediment Dynamics in Hudson River Wetlands
The Hudson River estuary (New York, USA) is a heavily urbanized estuary with a long history of environmental impacts from anthropogenic activities for hundreds of years. The estuary is intensely utilized, serving over ten million people throughout New York, Connecticut, and New Jersey. The portion …
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Late Holocene hurricane activity and climate variability in the northeastern Gulf of Mexico
Hurricane activity in the Northeastern Gulf of Mexico and its relationship to regional and large-scale climate variability during the Late Holocene is explored. A 4500-year record of hurricane-induced storm surges is developed from sediment cores collected from a coastal sinkhole near Apalachee …
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Development and application of the mollusc Arctica islandica as a paleoceanographic tool for the North Atlantic ocean
Until now there has been no tool comparable to corals for reconstructing long term high-resolution geochemical time-series for the colder, higher-latitude oceans. In this thesis, the long-lived (+100 years) boreal mollusc (Bivalvia) Arctica islandica is shown to be practical for this purpose in the …
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Antarctica's Geologic and Ice Sheet History from Isotopic Sedimentary Provenance Studies
… be submitted to Earth and Planetary Sciences and Paleoclimatology, Palaeoecology & Paleoceanography, respectively. In Chapter 2, I demonstrated that (1) four main sectors between the Ross Sea and Prydz Bay, separated by ice drainage divides, are distinguishable based upon the combination of …
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Aridification of the Indian subcontinent during the Holocene : implications for landscape evolution, sedimentation, carbon cycle, and human civilizations
The Indian monsoon affects the livelihood of over one billion people. Despite the importance of climate to society, knowledge of long-term monsoon variability is limited. This thesis provides Holocene records of monsoon variability, using sediment cores from river-dominated margins of the Bay of …
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Late Quaternary environmental and climatic history of the southern Chilean Lake Region interpreted from coleopteran (beetle) assemblages
<p>A diverse Coleoptera fauna of 462 species in 48 families was collected from 41 locations in the Parque Nacional de Puyehue and adjacent parts of the Lake Region of southern Chile. The sample locations ranged from rain forest habitats at sea-level to Andean tundra habitats at 1500 m msl. Cluster …
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Pollen and grain size records in abyssal sediments of the northwest Pacific Ocean as proxies of Plio-Pleistocene climate change /
A distinctive period of global change occurred during the PUocene between the warm Miocene and subsequent Quaternary cooling. Samples from Ocean Drilling Project Site 11 79 (-5586 mbsl, 41°4'N, 159°57'E), Site 881 (-5765 mbsl, 47°6.133'N, 161°29.490'E) and Site 882 (-3255 mbsl, 50°22'N, 167°36'E) …
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Generation of Buried Transient Landscapes and Residual Depth Anomalies
During Cenozoic times, the Icelandic plume has played a dominant role in controlling periodic uplift of oceanographic gateways across the North Atlantic Ocean. Five exquisitely preserved Paleogene buried landscapes are mapped on three-dimensional seismic reflection surveys from the Faroe-Shetland …
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