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Now showing items 41-50 of 71
Constraining circulation changes through the last deglaciation with deep-sea coral radiocarbon and sedimentary ²³¹Pa/²³⁰Th
(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 ...
Influence of meltwater on Greenland Ice Sheet dynamics
(Massachusetts Institute of Technology, 2017)
Seasonal fluxes of meltwater control ice-flow processes across the Greenland Ice Sheet ablation zone and subglacial discharge at marine-terminating outlet glaciers. With the increase in annual ice sheet meltwater production ...
Experimental studies of melting and crystallization processes in planetary interiors
(Massachusetts Institute of Technology, 2011)
Melting and crystallization processes on the Earth and Moon are explored in this thesis, and the topics of melt generation, transport, and crystallization are discussed in three distinct geologic environments: the Moon's ...
A scientific framework for evaluating coral reef resilience to climate change
(Massachusetts Institute of Technology, 2016)
The 21st century warming and acidification of tropical oceans will impact the structure and function of coral reef ecosystems. Consequently, conservation efforts are increasingly focused on identifying and protecting reef ...
An investigation of basin-scale controls on upper ocean export and remineralization
(Massachusetts Institute of Technology, 2018)
The biological carbon pump (BCP) helps to moderate atmospheric carbon dioxide levels by bringing carbon to the deep ocean, where it can be sequestered on timescales of centuries to millennia. Climate change is predicted ...
Ecosystem metabolism in salt marsh tidal creeks and ponds : applying triple oxygen isotopes and other gas tracers to novel environments
(Massachusetts Institute of Technology, 2017)
Salt marshes are physically, chemically, and biologically dynamic environments found globally at temperate latitudes. Tidal creeks and marshtop ponds may expand at the expense of productive grass-covered marsh platform. ...
Geophysical and petrological constraints on ocean plate dynamics
(Massachusetts Institute of Technology, 2017)
This thesis investigates the formation and subsequent motion of oceanic lithospheric plates through geophysical and petrological methods. Ocean crust and lithosphere forms at mid-ocean ridges as the underlying asthenosphere ...
Linear and nonlinear stratified spindown over sloping topography
(Massachusetts Institute of Technology, 2010)
In a stratified rotating fluid, frictionally driven circulations couple with the buoyancy field over sloping topography. Analytical and numerical methods are used to quantify the impact of this coupling on the vertical ...
Controls on earthquake rupture and triggering mechanisms in subduction zones
(Massachusetts Institute of Technology, 2010)
Large earthquake rupture and triggering mechanisms that drive seismicity in subduction zones are investigated in this thesis using a combination of earthquake observations, statistical and physical modeling. A comparison ...
Mechanical and geological controls on the long-term evolution of normal faults
(Massachusetts Institute of Technology, 2015)
This thesis investigates the long-term evolution of rift-bounding normal faults. To first order, the observed diversity of extensional tectonic styles reflects differences in the maximum offset that can be accommodated on ...