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Now showing items 11-20 of 21
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 ...
Halogenated 1'-methyl-1,2'-bipyrroles (MBPs) in the Norwestern Atlantic
(Massachusetts Institute of Technology, 2009)
Halogenated 1'-methyl-1,2'-bipyrroles (MBPs) are a distinctive class of marine organic compounds. They are naturally produced, they have a unique carbon structure, they are highly halogenated, and they bioaccumulate in ...
The fluvial geochemistry of the rivers of Eastern Siberia and implications for the effect of climate on weathering
(Massachusetts Institute of Technology, 1998)
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 ...
Tropical cyclones within the sedimentary record : analyzing overwash deposition from event to millennial timescales
(Massachusetts Institute of Technology, 2009)
Tropical cyclone activity over the last 5000 years is investigated using overwash sediments from coastal lagoons on the islands of Vieques, Puerto Rico and Koshikijima, Japan. A simple sediment transport model can reproduce ...
Observations of turbulent fluxes and turbulence dynamics in the ocean surface boundary layer
(Massachusetts Institute of Technology, 2008)
This study presents observations of turbulence dynamics made during the low winds portion of the Coupled Boundary Layers and Air-Sea Transfer experiment (CBLAST-Low). Observations were made of turbulent fluxes, turbulent ...
Air-sea interaction at contrasting sites in the Eastern Tropical Pacific : mesoscale variability and atmospheric convection at 10°N
(Massachusetts Institute of Technology, 2007)
The role of ocean dynamics in driving air-sea interaction is examined at two contrasting sites on 125°W in the eastern tropical Pacific Ocean using data from the Pan American Climate Study (PACS) field program. Analysis ...
Geochemical tools and paleoclimate clues : multi-molecular and isotropic investigations of tropical marine sediments and alpine ice
(Massachusetts Institute of Technology, 2006)
South American climate has undergone dramatic changes since the last glacial period, as evidenced from Cariaco Basin (Venezuelan coast) and Peru Margin marine sediment biomarker records. Compounds derived from vascular ...