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 48 for “"thermal maximum"”.
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A magmatic trigger for the Paleocene-Eocene Thermal Maximum?
… ocean-atmosphere system. This Paleocene-Eocene Thermal Maximum (PETM) is often cited as an analogue of anthropogenic climate change. Many trigger mechanisms for the carbon release at the PETM have been proposed. Common to all scenarios is rapid release of isotopically light carbon (<13C/12C …
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A magmatic trigger for the Paleocene-Eocene thermal maximum?
… ocean-atmosphere system. This Paleocene-Eocene Thermal Maximum (PETM) is often cited as an analogue of anthropogenic climate change. Many trigger mechanisms for the carbon release at the PETM have been proposed. Common to all scenarios is rapid release of isotopically light carbon (<¹³C/¹²C …
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A multi-proxy study of the Palaeocene - Eocene Thermal Maximum in northern Spain
… warming event, termed the Paleocene-Eocene Thermal Maximum (PETM), occurred. Records of this event are characterised by a negative carbon isotope excursion (CIE) which has been associated with the release of thousands of petagrams of isotopically light carbon into the ocean-atmosphere …
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Changes in morphological disparity in eutherian mammals across the K-Pg boundary and Palaeocene-Eocene Thermal Maximum using discrete morphofunctional characters
… eutherian evolution is the Palaeocene-Eocene Thermal Maximum (PETM), a period of particularly high global temperatures ~55 million years ago, which coincided with major faunal turnover. However, the extent to which the PETM affected eutherian disparity, and how this compares to the changes …
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Effects of chronic, sublethal ferric iron exposure on the critical swim speed of rainbow trout (Oncorhynchus mykiss) and critical thermal maximum of cutthroat trout (Oncorhynchus clarkii)
… concentrations of ferric iron. The critical thermal maximum (CTmax) and changes in weight were tested. There were no significant changes in CTmax or weight measured in the second experiment.
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Oxygen Uptake as an Indictor of Metabolic Rate in a Neotenic Population of Eurycea Multiplicata
… animals appeared to be close to their lethal thermal maximum at 25°C.
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Thermal Adaptation in Largemouth Bass Populations Inhabiting Power Plant Cooling Reservoirs
The objective of this study was to test for thermal adaptation in largemouth bass (Micropterus salmoides) populations inhabiting two power plant cooling reservoirs in central Texas. The offspring of bass from the two test reservoirs and two control reservoirs were raised under near identical …
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A stable isotope stratigraphy for the Axel Heiberg Fossil Forest and its application to Eocene climate
… on the scale of the Paleocene-Eocene Thermal Maximum benthic carbon excursion of [approx.] 2.6%₀ (Zachos 1999). However, terrestrial flora are less sensitive to CO₂ fluctuations given their capacity to regulate stomatal intake and the comparatively easy diffusion of CO₂ in air. …
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Effects of annual thermal regime on growth trajectories of native age-0 brook trout (Salvelinus Fontinalis)
… such changes. Brook trout are considered stenothermal, with a thermal preference of 14°C to 18°C, and a critical thermal maximum of 25°C. With such narrow thermal optima, brook trout are restricted to watersheds with adequate thermal refugia to withstand warm summer temperatures. For …
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Ore mineralogy and paragenesis of a portion of the Great Gossan Lead district, Virginia
… have been subject to the same metamorphism. At a thermal maximum of 4l5-455°C, the ore assemblage would have developed a sulfur activity of approximately 10-9 to 10-7 atm. and would have been subject to an oxygen activity of about 10 -25 to 10 -27 atm. The Great Gossan Lead is interpreted to have …
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Paleogene-Early Neogene palynomorphs from the Eastern Equatorial Atlantic and Southeastern Florida, USA: Biostratigraphy and paleoenvironmental implications
… from greenhouse conditions (Paleocene-Eocene Thermal Maximum, PETM) to icehouse conditions (Early Oligocene) is not well documented in tropical-subtropical regions. One hundred and five samples from Ocean Drilling Program (ODP) Site 959 (Hole 959A and Hole 959D) in the Cote d'Ivoire-Ghana …
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Structural evolution of the Max Meadows thrust sheet, Southwest Virginia
… folding and cleavage formation records the thermal maximum (200-300+°C). Syntectonic veins indicate that fluid pressures (P<sub>f</sub>) in excess of only the minimum compressive stress prevailed during ductile deformation. Increasing fluid pressures and/or decreasing confining pressures …
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Inferring Extinct Reptilian Response To Global Warming: Insights From Modern Stable Isotope Ratios
… this is not a unique event. Early Cenozoic hyperthermals were comparable to the perturbations currently experienced by living species. Understanding ecology through time must acknowledge the dynamic relationship between an organism and its environment on multiple scales. Ecological inferences can …
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Differential Thermal Isotope Analysis: A Method for the Study of Past Climates
… carried out developing the online Differential Thermal Isotope Analysis (DTIA) method, including demonstrations of the method on gypsum samples and clay samples, and the application of DTIA to the ongoing research into climate conditions during the Paleocene-Eocene Thermal Maximum (PETM). …
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Carbon Cycle Trends Recorded By Organic Carbon Stable Isotopes In Paleocene Strata, Benton County, Mississippi: Implications For Chronostratigraphy Of The Porters Creek And Naheola Formations
The paleocene-eocene thermal maximum (petm) is one of the most studied carbon isotope excursions in earth's history. The petm occurred 55 million years ago when excess isotopically heavy carbon (c13) was added into earth's carbon cycle, resulting in ecological and environmental changes. The petm is …
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Marine carbonate accumulation during the greenhouse climate of the Eocene
… ocean-atmosphere system, e.g. Paleocene Eocene Thermal Maximum (PETM), ca. 56 Ma, which were preserved as negative carbon isotope excursions (CIEs) in the sedimentary record. The hothouse climate of early Eocene transitioned to a relatively cooler and less explored ‘warmhouse’ regime during …
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Changes in climate and catchment processes over the middle and late Holocene in the boreal region of northeastern Ontario, Canada
… varied substantially over the Holocene. Holocene Thermal Maximum (HTM) warmth occurred earlier in the west with associated aridity, compared to the east which was humid. Specific regions of North America, however, are underrepresented in continental reconstructions of Holocene climate including …
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Paleoenvironment reconstruction in extreme climates using organic geochemical investigations
… of rapid warming events occurred termed hyperthermals. The largest of these, the Paleocene-Eocene Thermal Maximum is perhaps the best analog to modern day anthropogenic climate change. It is paramount to understand the global effects of this event to elucidate potential changes in our near …
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Palaeoclimatology of the late Palaeocene to middle Eocene: geochemical records of stable and transient climate states
… quasi-stable state. The Palaeocene { Eocene Thermal Maximum (PETM) represents a significant input of exogenic carbon into the atmosphere over the course of several thousand years and significant warming of the Earth. Records of bulk carbonate isotopes from a section in NE Italy show several …
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Stratigraphy and Palaeoenvironment of the Paleocene/Eocene boundary interval in the Indus Basin, Pakistan
… is associated with the PETM (Paleocene Eocene Thermal Maximum) global climatic event and allows the recognition of the P/E boundary in shallow water carbonates of the Indus Basin. This turnover is already reported from other Tethyan sections and from the Salt Range (Upper Indus Basin), …
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