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Constraining North Atlantic circulation with transient tracer observations
(Massachusetts Institute of Technology, 2003)
The capability of transient tracers to constrain the ocean circulation in the North Atlantic is explored. Study of an idealized tracer shows that inferences of circulation properties from transient state distributions are ...
Geochemistry of hydrothermal vent fluids from the northern Juan De Fuca Ridge
(Massachusetts Institute of Technology, 2003)
The presence of aqueous organic compounds derived from sedimentary organic matter has the potential to influence a range of chemical processes in hydrothermal vent environments. For example, hydrothermal alteration experiments ...
The marine biogeochemistry of molybdenum
(Massachusetts Institute of Technology, 2003)
Prevailing wisdom holds that the vertical distribution of molybdenum (Mo) in the open ocean is conservative, despite Mo's important biological role and association with Mn oxides and anoxic sediments. Mo is used in both ...
Decoupling of iron and phosphate in the global ocean
(Massachusetts Institute of Technology, 2003)
Iron (Fe) is an essential micronutrient for marine phytoplankton often limiting phytoplankton growth due to its low concentration in the ocean and thus playing a role in modulating the ocean's biological pump. In order to ...
Eddies and friction : removal of vorticity from the wind-driven gyre
(Massachusetts Institute of Technology, 2003)
Inertial terms dominate the single-gyre ocean model and prevent western-intensification when the viscosity is small. This occurs long before the oceanically-appropriate parameter range. It is demonstrated here that the ...
The evolution of upper ocean thermal structure at 10⁰N, 125⁰W during 1997-1998
(Massachusetts Institute of Technology, 2003)
In this thesis I have endeavored to determine the factors and physical processes that controlled SST and thermocline depth at 10⁰N, 125⁰W during the Pan Amer- ican Climate Study (PACS) field program. Analysis based on the ...
Radium isotopes as tracers of coastal circulation pathways in the Mid-Atlantic Blight
(Massachusetts Institute of Technology, 2003)
Pathways of exchange between the shelf and slope in the Mid-Atlantic Bight were investigated using a combination of radiochemical tracer and hydrographic measurements. The motivation was to provide evidence of transport ...
Fine-grained sedimentation on the Chenier Plain Coast and inner continental shelf, northern Gulf of Mexico
(Massachusetts Institute of Technology, 2003)
This thesis examines the evolution of a mud-dominated coastal sedimentary system on multiple time scales. Fine-grained systems exhibit different properties and behavior from sandy coasts, and have received relatively little ...
A laboratory study of localized boundary mixing in a rotating stratified fluid
(Massachusetts Institute of Technology, 2003)
Oceanic observations indicate that abyssal mixing is localized in regions of rough topography. How locally mixed fluid interacts with the ambient fluid is an open question. Laboratory experiments explore the interaction ...
Subduction dynamics at the middle America trench : new constraints from swath bathymetry, multichannel seismic data, and ¹⁰Be
(Massachusetts Institute of Technology, 2003)
The cosmogenic radionuclide ¹⁰Be is a unique tracer of shallow sediment subduction in volcanic arcs. The range in ¹⁰Be enrichment in the Central American Volcanic Arc between Guatemala and Costa Rica is not controlled by ...