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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 ...
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 ...
Storm signatures in coastal ponds and marshes over the late Holocene
(Massachusetts Institute of Technology, 2019)
Tropical cyclones pose a growing threat to coastal populations, especially as both populations and infrastructure are increasingly concentrated along the eastern coast of the United States. This thesis seeks to characterize ...
Dynamics and kinematics of an estuarine network
(Massachusetts Institute of Technology, 2019)
This thesis addresses the dynamics of estuarine networks, based on hydrographic observations in Newark Bay, a sub-estuarine network connected to the Hudson River estuary through New York Harbor. Estuarine networks differ ...
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 ...
Reconstructing atmospheric changes in monsoon regions using eolian dust
(Massachusetts Institute of Technology, 2019)
Mineral dust is generated in continental interiors and exported by winds to ocean basins, providing a sedimentary archive which is one of the few direct indicators we have of atmospheric circulation in the past. This archive ...
Greenlandic ice archives of North Atlantic Common Era climate
(Massachusetts Institute of Technology, 2019)
The Common Era (A.D. 1- present) represents a crucial period for climatic studies, documenting the timespan over which human activities have become an increasingly domineering force in shaping Earth's landscape, climate, ...
The mineralogy and chemistry of modern shallow-water and deep-sea corals
(Massachusetts Institute of Technology, 2019)
The architecture of coral reef ecosystems is composed of coral skeletons built from the mineral aragonite (CaCO3). Coral reefs are currently being threatened by ocean acidification (OA), which may lower calcification rates, ...