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Finescale abyssal turbulence : sources and modeling
(Massachusetts Institute of Technology, 2020)
A detailed understanding of the intensity and three-dimensional spatial distribution of diabatic abyssal turbulence is germane to understanding the abyssal branch of the global overturning circulation. This thesis addresses ...
Investigating Mexican paleoclimate with precisely dated speleothems
(Massachusetts Institute of Technology, 2020)
Speleothems, or sedimentary rocks formed in caves, act as valuable archives of past climate change due to their suitability for U-series dating and high-resolution proxy analysis. These records can provide insights into ...
High resolution sedimentary archives of past millennium hurricane activity in the Bahama Archipelago
(Massachusetts Institute of Technology, 2020)
Atlantic hurricanes threaten growing coastal populations along the U.S. coastline and in the Caribbean islands. Unfortunately, little is known about the forces that alter hurricane activity on multi-decadal to centennial ...
Residual overturning circulation and its connection to Southern Ocean dynamics
(Massachusetts Institute of Technology, 2020)
Over the last 20 years, our understanding of the meridional overturning circulation has improved, but primarily in a two-dimensional, zonally-averaged framework. In this thesis, I have pushed beyond this simplification and ...
New insights into the marine oxygen cycle from manganese oxide minerals and reactive oxygen species
(Massachusetts Institute of Technology, 2020)
The redox cycling of oxygen between O₂, water, and intermediate redox states including hydrogen peroxide and superoxide, has profound impact on the availability and distribution of dissolved O₂, the habitability of the ...
Wave-driven geomorphology of Pacific carbonate coastlines : from landscape to wavelength scale
(Massachusetts Institute of Technology, 2020)
The shallow marine ecosystems of coral atolls and the human communities they support are among the most vulnerable to anthropogenic climate change. Sea-level rise threatens to inundate low-lying reef islands, tropical ...
U-Th dating of lacustrine carbonates
(Massachusetts Institute of Technology, 2020)
Carbonates are prevalent in many modern and ancient lacustrine settings, but reconstructions of past lake levels or environments from such materials have been hindered by poor chronology. Uranium-thorium (U-Th) dating has ...
Protein regulation in Trichodesmium and other marine bacteria : observational and interpretive biomarkers of biogeochemical processes
(Massachusetts Institute of Technology, 2020)
Marine microbes play key roles in global biogeochemistry by mediating chemical transformations and linking nutrient cycles to one another. A major goal in oceanography is to predict the activity of marine microbes across ...
Characterizing cobalamin cycling by Antarctic marine microbes across multiple scales
(Massachusetts Institute of Technology, 2020)
Highly productive marine microbial communities in the coastal Southern Ocean sustain the broader Antarctic ecosystem and play a key role in Earth's climate via the biological pump. Regional phytoplankton growth is primarily ...