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Now showing items 21-30 of 89
Computational analysis of the biophysical controls on Southern Ocean phytoplankton ecosystem dynamics
(Massachusetts Institute of Technology, 2019)
Southern Ocean net community productivity plays an out sized role in regulating global biogeochemical cycling and climate dynamics. The structure of spatial-temporal variability in phytoplankton ecosystem dynamics is largely ...
The response of ocean salinity patterns to climate change : implications for circulation
(Massachusetts Institute of Technology, 2019)
Global patterns of ocean salinity arise from the exchange of freshwater between the sea surface and the atmosphere. For a quasi-steady state system, these surface fluxes are balanced by compensating transports of salt in ...
A modeling study of the marine biogeochemistry, plankton dynamics, and carbon cycle on the continental shelf off the West Antarctic Peninsula
(Massachusetts Institute of Technology, 2019)
Over the past several decades, the West Antarctic Peninsula (WAP) has undergone physical and ecological changes at a rapid pace, with warming surface ocean and a sharp decrease in the duration of the sea ice season. The ...
The role of zooplankton in regulating carbon export and phytoplankton community structure : integrating models and observations
(Massachusetts Institute of Technology, 2021)
In this thesis, I explore two topics in plankton ecology with a combination of models and observations. First, I investigate the contribution of zooplankton diel vertical migration (DVM) to the vertical flux of carbon as ...
Coral reefs in the anthropocene ocean : novel insights from skeletal proxies of climate change, impacts, and resilience
(Massachusetts Institute of Technology, 2021)
Anthropogenic emissions of greenhouse gases are driving rapid changes in ocean conditions. Shallow-water coral reefs are experiencing the brunt of these changes, including intensifying marine heatwaves (MHWs) and rapid ...
Radium isotopes and radon-222 as tracers of sediment-water interaction in Arctic coastal and lacustrine environments
(Massachusetts Institute of Technology, 2020)
Arctic marine and lacustrine systems are experiencing rapid warming due to climate change. These changes are especially important at the interface between sediments and surface waters because they are hotspots for ...
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 ...
Molecular Biogeochemistry of modern and ancient marine microbes
(Massachusetts Institute of Technology, 2010)
Biological activity has shaped the surface of the earth in numerous ways, but life's most pervasive and persistent global impact has been the secular oxidation of the surface environment. Through primary production - the ...
Physics of diurnal warm layers : turbulence, internal waves, and lateral mixing
(Massachusetts Institute of Technology, 2017)
The daily heating of the ocean by the sun can create a stably stratified near-surface layer when the winds are slight and solar insolation is strong. This type of shallow stable layer is called a Diurnal Warm Layer (DWL). ...
Dynamics of Greenland's glacial fjords
(Massachusetts Institute of Technology, 2016)
Glacial fjords form conduits between glaciers of the Greenland Ice Sheet and the North Atlantic. They are the gateways for importing oceanic heat to melt ice and for exporting meltwater into the ocean. Submarine melting ...