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 16 of 16 for “"warming events"”.
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Identification and Classification of Stratospheric Sudden Warming Events
… to identify and classify Stratospheric Sudden Warming events. A total of 41 events are identified during this 33 year period, resulting in an average occurrence rate of 1.24 events/year. No significant variation in the rate is observed during the period analyzed. The average temperature …
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Stratosphere - troposphere interaction during stratospheric sudden warming events
… stratospheric variability such as stratospheric warmings, these events are simulated in the described model for the study of stratosphere - troposphere coupling, while for comparison the coupling is also assessed for weaker stratospheric variability. While the upward coupling by planetary-scale …
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Downward influence of stratospheric final warming events in an idealized model
The stratospheric final warming is the final transition of the zonal winds from wintertime westerlies to summertime easterlies as the solar heating of the high latitude stratosphere increases in the springtime. Recent observational analyses suggested that stratospheric final warming makes a …
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A new hypothesis for the 1470-year cycle of abrupt warming events in the last ice-age
… climate cycle, which manifests itself in abrupt warming events (the socalled Dansgaard-Oeschger events, or DO events). According to the hypothesis, two century-scale solar cycles could explain the regularity in the timing of the DO events, since the periods of these two cycles are close to …
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Variability of the polar stratospheric vortex and its impact on surface climate patterns
… timing of the final breakup of the vortex (final warming events), the conditions of occurrence and frequency of midwinter warming events, and the impact of the stratospheric seasonal cycle on the troposphere are explored. The inclusion of wavenumber 1 and wavenumber 2 topographies results in very …
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Chironomid-based paleotemperature reconstruction of the North Slave Region, Northwest Territories during the Late Holocene
… reconstruction had similar late Holocene climate events as other regional climate records, such as brief warming events throughout the 1700s and the current warming trend (~ 1850 - present day). A paleofire-climate analysis was also conducted, however, there was no relationship between …
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Inferring Extinct Reptilian Response To Global Warming: Insights From Modern Stable Isotope Ratios
… assemblage, a key time between two major global warming events (Paleocene-Eocene Thermal Maximum and Early Eocene Climatic Optimum). I identify xenosaurid and glyptosaurine squamates and alethinophidian snakes. The xenosaurid is one of the youngest representatives of Restes rugosus, and I provide …
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Dynamical Influences of Sudden Stratospheric Warmings on Surface Climate
… a complete breakdown during sudden stratospheric warming events. In the Northern Hemisphere these events are often accompanied by the descent of anomalous flow regimes which can result in extreme surface weather. The focus of this thesis is to assess sudden stratospheric warmings and their place …
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Paleoenvironment reconstruction in extreme climates using organic geochemical investigations
… higher background temperature a series 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 …
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On the external forcing of Indian Ocean climate variability across timescales
… forcings include low-probability, high-impact events like explosive volcanic eruptions as well as the continued injection of anthropogenic greenhouse gases into the atmosphere. This thesis explores how external forcings affect Indian Ocean climate in the past, present, and future using …
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On the external forcing of Indian Ocean climate variability across timescales
… forcings include low-probability, high-impact events like explosive volcanic eruptions as well as the continued injection of anthropogenic greenhouse gases into the atmosphere. This thesis explores how external forcings affect Indian Ocean climate in the past, present, and future using …
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Four problems in nonlinear Earth system dynamics
… abrupt. The latter include “hyperthermal” global warming events, “Snowball Earth” glaciations, and mass extinctions. Although the details are different, underpinning them all is the nonlinearity of the Earth system: small changes sometimes trigger much larger responses. This thesis addresses four …
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Sequence Stratigraphy and Depositional Controls on Oligocene-Miocene Caribbean Carbonate-Dominated Systems, Puerto Rico and the Dominican Republic
… during this time (e.g., regional upwelling, warming events, coral extinctions, tectonism, and sea-level changes). The middle-early late Miocene (ca. 13-10 Ma) Ponce Limestone in southern Puerto Rico is an example of one of these systems and the focus of a detailed study presented in Chapter …
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Marine carbonate accumulation during the greenhouse climate of the Eocene
… during early Eocene, punctuated by multiple events of rapid injection of isotopically light carbon into the 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 …
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Sea level variability in the Tropical Atlantic since 1993 and projections to 2100
… the influence of extreme warm and cold events, such as Atlantic Niños and Benguela Niños, driven by remote equatorial Kelvin waves (EKW) and local factors such as wind and freshwater fluxes. Analysis of coastal trapped Kelvin waves (CTWs) in the GoG in relation to major warming events in …
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Comparative studies on Macrocystis pyrifera and Ecklonia maxima (Laminariales) in South Africa; investigating the use of M. pyrifera as abalone feed in South African aquaculture and assessing the vulnerability of these two species to Marine Heat Waves
… duration and intensity of extreme climatic events such as storms and Marine Heat Waves (MHW’s). The second study investigated the impact of MHW’s on both M. pyrifera and E. maxima recruits. Recruits of both species were exposed to an experimentally simulated MHW for a 72 hour period. …