Browsing Earth, Atmospheric and Planetary Sciences - Ph.D. / Sc.D. by Issue Date
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- Browsing Earth, Atmospheric and Planetary Sciences - Ph.D. / Sc.D. by Issue Date
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Browsing Earth, Atmospheric and Planetary Sciences - Ph.D. / Sc.D. by Issue Date
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(Massachusetts Institute of Technology, 2012)Driven by increasingly heavy oil reserves and more efficient refining technologies, use of heavy fuel oils for power generation is rising. Unlike other refined products and crude oils, a large portion of these heavy oils ...
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(Massachusetts Institute of Technology, 2012)The stratosphere and the troposphere exhibit a strong coupling during the winter months. However, the coupling mechanisms between the respective vertical layers are not fully understood. An idealized spectral core dynamical ...
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(Massachusetts Institute of Technology, 2012)Trace metal cycling is one of many processes that influence ocean ecosystem dynamics. Cobalt, iron, and manganese are redox active trace metal micro-nutrients with oceanic distributions that are influenced by both biological ...
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(Massachusetts Institute of Technology, 2012)Observations from a three-year field program on the inner shelf south of Martha's Vineyard, MA and a numerical model are used to describe the effect of stratification on inner shelf circulation, transport, and sediment ...
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(Massachusetts Institute of Technology, 2012)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 ...
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(Massachusetts Institute of Technology, 2012)This thesis focuses on ocean circulation and atmospheric forcing in the Atlantic Ocean at the Last Glacial Maximum (LGM, 18-21 thousand years before present). Relative to the pre-industrial climate, LGM atmospheric CO₂ ...
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(Massachusetts Institute of Technology, 2012)Global warming has led to a significant increase in Greenland ice sheet (GrIS) melt and runoff since 1990, resulting in escalated export of fresh water and associated sediment to the surrounding North Atlantic and Arctic ...
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(Massachusetts Institute of Technology, 2012)Oceanic transform faults that accommodate strain at mid-ocean ridge offsets represent a unique environment for studying fault mechanics. Here, I use seismic observations and models to explore how fault structure affects ...
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(Massachusetts Institute of Technology, 2012)The structure of the oceanic lithosphere results from magmatic and extensional processes taking place at mid-ocean ridges (MORs). The temporal and spatial scales of the variability of these two processes control the degree ...
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(Massachusetts Institute of Technology, 2012)The distribution and magnitude of marine primary production helps determine the ocean's role in global carbon cycling. Constraining factors that impact this productivity and elucidating selective pressures that drive the ...
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(Massachusetts Institute of Technology, 2012)Mesoscale eddies mix and transport tracers such as heat and potential vorticity laterally in the ocean. While this transport plays an important role in the climate system, especially in the Southern Ocean, we lack a, ...
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(Massachusetts Institute of Technology, 2012)Determining timescales of the formation and preservation of carbonate alteration products in mantle peridotite is important in order to better understand the role of this potentially important sink in the global carbon ...
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(Massachusetts Institute of Technology, 2012)Microbial sulfate reduction (MSR) utilizes sulfate as an electron acceptor and produces sulfide that is depleted in heavy isotopes of sulfur relative to starting sulfate. The fractionation of S-isotopes is commonly used ...
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(Massachusetts Institute of Technology, 2012)Radioisotopic dating can provide critical constraints for understanding the rates of tectonic, dynamic and biologic processes operating on our planet. Improving the interpretation and implementation of geochronologic data ...
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(Massachusetts Institute of Technology, 2012)In this thesis, we developed a generalized Radon transform of SS precursors for large-scale, high-resolution seismo-stratigraphy of the upper mantle transition zone. The generalized Radon transform (GRT) is based on the ...
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(Massachusetts Institute of Technology, 2012)The range of geologic problems that may be addressed by U-Pb geochronology is governed by the precision to which U-Pb dates can be measured, expressed as their estimated uncertainties. Accurate and precise knowledge of ...
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(Massachusetts Institute of Technology, 2012)As the only low-latitude connection between ocean basins, the Indonesian Throughflow allows the direct transmission of heat and salinity between the Pacific and Indian Oceans. Despite its potential importance, the role of ...
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(Massachusetts Institute of Technology, 2012)Radioactive isotopes can be used in paleoceanography both for dating samples and as tracers of ocean processes. Here I use radiocarbon and uranium series isotopes to investigate the ocean's role in climate change over the ...
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(Massachusetts Institute of Technology, 2012)Atmospheric observations and atmospheric observation-based global emission estimates are presented for the five high molecular weight perfluorocarbons (PFCs): decafluorobutane (C 4 F 1 0 ), dodecafluoropentane (C5 F1 2 ), ...
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(Massachusetts Institute of Technology, 2012)In this thesis use a variety of geological observations to address the record of Neogene crustal deformation in the Central Aegean region, thereby providing new constraints on the overall geometric and tectonic evolution ...
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