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Physical Sciences and Mathematics Commons™
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Full-Text Articles in Physical Sciences and Mathematics
Investigating The Recent History Of A Changing Planet With Innovative Isotopic Techniques And New Geologic Archives, Ryan A. Venturelli
Investigating The Recent History Of A Changing Planet With Innovative Isotopic Techniques And New Geologic Archives, Ryan A. Venturelli
USF Tampa Graduate Theses and Dissertations
Globally averaged Earth surface temperatures indicate a 0.8°C warming since 1880. Though this warming is a result of anthropogenic influence that has exceeded natural forcings, a thorough understanding of Earth's climate system requires a knowledge of changes in global temperatures beyond the instrumental record. To achieve this, we must supplement the temporally limited observational record with proxy records of environmental conditions in the geologic past. Though the foundational questions underlying interrogations of the geologic past are seemingly simple (What happened? When?), the accuracy of their answers depend upon accessibility and availability of geologic materials as well as the capabilities of …
Resolving Chronological And Temperature Constraints On Antarctic Deglacial Evolution Through Improved Dating Methodology, Cristina Subt
Resolving Chronological And Temperature Constraints On Antarctic Deglacial Evolution Through Improved Dating Methodology, Cristina Subt
USF Tampa Graduate Theses and Dissertations
In order to determine the timing of Antarctic ice sheet retreat and advance during the Late Quaternary, various tools are used to measure the age of marginal marine sediments. Carbonate 14C dating is a well-established approach, but requires foraminiferal microfossils, shells or other carbonate materials that are rare in most Antarctic regions, and may also suffer from vital effects, which can result in variability of up to 500 years in living organisms. Bulk acid insoluble organic (AIO) 14C dates are frequently as an alternative, but this approach works best where high productivity and sedimentation rates reign, and not too well …
Millennial-Scale Variability Of A Major East Antarctic Outlet Glacier During The Last Glaciation, Michelle Guitard
Millennial-Scale Variability Of A Major East Antarctic Outlet Glacier During The Last Glaciation, Michelle Guitard
USF Tampa Graduate Theses and Dissertations
Ongoing retreat of Antarctica’s marine-based glaciers is associated with warm (~2° C) modified Circumpolar Deep Water intrusion onto the continental shelf, suggesting that Southern Ocean temperatures may influence Antarctic ice sheet stability. Understanding past cryosphere response to environmental forcing is crucial to modeling future ice sheet behavior. Of particular interest is the response of the East Antarctic Ice Sheet (EAIS), which stands to contribute ~20 m to global sea level. However, marine sediment sequences recording timing and variability of EAIS fluctuations through the last major climate shift, the Last Glacial Maximum (LGM), are either missing from the margin or have …