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Now showing items 51-58 of 58
The entrainment and homogenization of tracers within the cyclonic gulf stream recirculation gyre
(Massachusetts Institute of Technology, 1987)
The various distributions of tracer associated with the Northern Recirculation Gyre of the Gulf Stream (NRG) are studied to try to obtain information about the flow. An advective-diffusive numerical model is implemented ...
The marine geochemistry of iron and iron isotopes
(Massachusetts Institute of Technology, 2004)
This thesis addressed questions about the Fe cycle by measuring detailed profiles and transects of Fe species in the ocean and also by exploring the use of a new tracer of Fe, Fe isotopic fractionation. In the subtropical ...
Mechanisms of metal release from contaminated coastal sediments
(Massachusetts Institute of Technology, 2005)
The fate of trace metals in contaminated coastal sediments is poorly understood, yet critical for effective coastal management. The aim of this thesis is to investigate and quantify the mechanisms leading to the release ...
Isotopic constraints on the sources and associations of organic compounds in marine sediments
(Massachusetts Institute of Technology, 2006)
To provide a new perspective on the fate of both natural organic matter and hydrophobic organic contaminants (HOCs) in marine sediments, we have investigated the relationship between radiocarbon (14C) age and the different ...
The distribution and history of nuclear weapons related contamination in sediments from the Ob River, Siberia as determined by isotopic ratios of Plutonium, Neptunium, and Cesium
(Massachusetts Institute of Technology, 2002)
This thesis addresses the sources and transport of nuclear weapons related contamination in the Ob River region, Siberia. In addition to being one of the largest rivers flowing into the Arctic Ocean, the bulk of the former ...
The paleoceanography of the Bering Sea during the last glacial cycle
(Massachusetts Institute of Technology, 2006)
In this thesis, I present high-resolution stable-isotope and planktonic-fauna records from Bering Sea sediment cores, spanning the time period from 50,000 years ago to the present. During Marine Isotope Stage 3 (MIS3) at ...
Plutonium isotopes in the North Atlantic
(Massachusetts Institute of Technology, 1986)
An organic geochemical approach to problems of glacial-interglacial climatic variability
(Massachusetts Institute of Technology, 1988)