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A laboratory study of the friction behavior of granular materials
(Massachusetts Institute of Technology, 2002)
I report on laboratory experiments designed to investigate the microphysical processes that result in rate- and state-dependent friction behavior and experiments designed to match the boundary conditions used by numerical ...
Petrological and geochronological constraints on the metamorphic evolution of high-pressure granulites and eclogites of the Snowbird tectonic zone, Canada
(Massachusetts Institute of Technology, 2003)
This thesis examines the petrology and geochronology of high-pressure granulites and eclogites within the Snowbird tectonic zone of the western Canadian Shield. The focus of this study is the East Athabasca mylonite triangle ...
Interannual variability of air-sea fluxes of carbon dioxide and oxygen
(Massachusetts Institute of Technology, 2002)
The currently observed increase in atmospheric CO2 due anthropogenic emissions is substantially slowed by natural processes that incorporate CO2 into the terrestrial biota and the ocean. Year-to-year changes in the CO2 ...
Dependence of tropical cirrus clouds on sea surface temperature and consequences for the Archean climate
(Massachusetts Institute of Technology, 2009)
In this thesis, we study observationally the variation of upper level cloud fraction with sea surface temperature in tropical oceanic regions. We also explore the consequences of a cloud feedback, arising from variations ...
Full wavefield inversion methods for monitoring time-lapse subsurface velocity changes
(Massachusetts Institute of Technology, 2014)
Quantitative measurements of seismic velocity changes from time-lapse seismic experiments provide dynamic information about the subsurface that improves the understanding of the geology and reservoir properties. In this ...
Buoyancy-driven circulation in the Red Sea
(Massachusetts Institute of Technology, 2014)
This thesis explores the buoyancy-driven circulation in the Red Sea, using a combination of observations, as well as numerical modeling and analytical method. The first part of the thesis investigates the formation mechanism ...
Crustal accretion and evolution at slow and ultra-slow spreading mid-ocean ridges
(Massachusetts Institute of Technology, 2001)
Half of the ocean crust is formed at spreading centers with total opening rates less than 40 km/Myr. The objective of this Thesis is to investigate temporal variations in active ridge processes and crustal aging at ...
Relating the biogeochemistries of zinc, cobalt, and phosphorus to phytoplankton activities in the sea
(Massachusetts Institute of Technology, 2006)
This thesis explores the potential of zinc, cobalt, and phosphorus to influence primary production in the subarctic North Pacific, the Bering Sea, and the North Atlantic Ocean. In the North Pacific and Bering Sea, total ...
Determining timescales of natural carbonation of peridotite in the Samail Ophiolite, Sultanate of Oman
(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 ...
Physiology of multiple sulfur isotope fractionation during microbial sulfate reduction
(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 ...