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Abrupt climate change in the Atlantic Ocean during the last 20,000 years : insights from multi-element analysis of benthic and planktic foraminifera and coupled OA-GCM
(Massachusetts Institute of Technology, 2005)
Minor and trace element records of planktic and benthic foraminifera from Atlantic sediment cores, as well as output from a coupled OAGCM, were used to investigate the magnitude and distribution of the oceanic response to ...
The temporal dynamics of terrestrial organic matter transfer to the oceans : initial assessment and application
(Massachusetts Institute of Technology, 2007)
This thesis employs compound-specific stable carbon and radiocarbon isotopic analysis of organic biomarkers to (a) resolve petrogenic from pre-aged vascular plant organic carbon (OC) in continental margin sediments, (b) ...
Cross-shelf circulation and momentum and heat balances over the inner continental shelf near Martha's Vineyard, Massachusetts
(Massachusetts Institute of Technology, 2007)
The water circulation and evolution of water temperature over the inner continental shelf are investigated using observations of water velocity, temperature, density, and bottom pressure; surface gravity waves; wind stress; ...
The East Greenland Coastal Current : its structure, variability, and large-scale impact
(Massachusetts Institute of Technology, 2008)
The subtidal circulation of the southeast Greenland shelf is described using a set of high resolution hydrographic and velocity transects occupied in summer 2004. The main feature present is the East Greenland Coastal ...
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 ...
Low-latitude Western North Atlantic climate variability during the past millennium : insights from proxies and models
(Massachusetts Institute of Technology, 2009)
Estimates of natural climate variability during the past millennium provide a frame of reference in which to assess the significance of recent changes. This thesis investigates new methods of reconstructing low-latitude ...
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 ...
Overflows and upper ocean interactions : a mechanism for the Azores current
(Massachusetts Institute of Technology, 2006)
The oceanic response to overflows is explored using a two-layer isopycnal model. Overflows are a major source of the dense water of the global deep ocean, originating from only a few marginal seas. They enter the open ocean ...
The evolution of oceanic gabbros : in-situ and ancient examples
(Massachusetts Institute of Technology, 2004)
This study is a geochemical investigation into the accretion of lower oceanic crust and processes of shallow melt-rock reaction at mid-ocean ridges. Major-, trace-elements, and isotopes from whole-rocks and minerals from ...
Wind, sea ice, inertial oscillations and upper ocean mixing in Marguerite Bay, Western Antarctic Peninsula : observations and modeling
(Massachusetts Institute of Technology, 2006)
Two years of moored oceanographic and automatic weather station data which span the winter ice seasons of 2001-2003 within Marguerite Bay on the western Antarctic Peninsula (wAP) shelf were collected as part of the Southern ...