Now showing items 452-471 of 868

    • Late Quaternary climate variability and terrestrial carbon cycling in tropical South America 

      Fornace, Kyrstin L. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2016-02)
      Characterizing global and regional climate variability and climate-carbon cycle interactions in the past provides critical context for evaluating present and future climate trends. In this thesis, I use stable isotope ...
    • Late quaternary sedimentation in the Eastern Angola Basin 

      Bornhold, Brian D. (Woods Hole Oceanographic Institution, 1973-11)
      Recent sedimentation in the eastern Angola Basin includes calcareous oozes in the north and south (Guinea Rise and Walvis Ridge) and hemipelagic lutites and terrigenous turbidites on the Congo Cone and on the Angola rise ...
    • Life cycle evolution and systematics of Campanulariid hydrozoans 

      Govindarajan, Annette F. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2004-09)
      The purpose of this thesis is to study campanulariid life cycle evolution and systematics. The Campanulariidae is a hydrozoan family with many life cycle variations, and provide an excellent model system to study life ...
    • Life cycle studies of the red tide dinoflagellate species complex Alexandrium tamarense 

      Brosnahan, Michael L. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2011-02)
      Blooms of toxic species within the algal dinoflagellate species complex Alexandrium tamarense may cause Paralytic Shellfish Poisoning, a significant and growing environmental threat worldwide. However, blooms of closely ...
    • Life history traits and population processes in marine bivalve molluscs 

      Ripley, Bonnie J. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1998-02)
      In this thesis, I investigated the how the life history characteristics of the clam Mya arenaria determine the population response to chronic contaminant exposure. To predict the potential responses of a broadcast-spawning ...
    • Linear and nonlinear Rossby waves in basins both with and without a thin meridional barrier 

      Atherton, Juli (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2002-02)
      The linear and nonlinear Rossby wave solutions are examined in homogeneous square basins on the ß-plane both with and without a thin meridional barrier In the presence of the meridional barrier the basin is almost ...
    • Linear and nonlinear stratified spindown over sloping topography 

      Benthuysen, Jessica A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2010-06)
      In a stratified rotating fluid, frictionally driven circulations couple with the buoyancy field over sloping topography. Analytical and numerical methods are used to quantify the impact of this coupling on the vertical ...
    • Linear normal mode analysis of baroclinic instability in a meridional channel 

      Walker, Alison (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2001-03)
      Numerical solutions of the unstable, growing modes are found for the two-layer inviscid quasigeostrophic equations in a meridional channel. A steady mean flow in the N-S direction is imposed in the upper layer, and it ...
    • Lipid biomarkers of coral stress : calibration and exploration 

      Kneeland, Jessie M. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2011-06)
      Corals are increasingly threatened by warming sea surface temperatures and other anthropogenic changes. The delicate symbiosis between corals and their algal endosymbionts (zooxanthellae) is easil ...
    • Lipoproteins and heat shock proteins as measures of reproductive physiology in the soft shell clam, Mya arenaria 

      Clayton, Maureen E. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1996-06)
      Reproduction is an important physiological process in marine bivalve molluscs. Experiments were designed to examine the role of lipoproteins and heat shock proteins in normal physiological processes of the soft shell ...
    • Lithospheric dynamics of Earth’s subduction zones and Martian tectonic provinces 

      Ding, Min (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2015-02)
      This thesis investigates lithospheric dynamics of Earth’s subduction zones and Martian tectonic provinces on multiple time scales. In Chapter 2, I use geodetic observations to constrain the post-seismic viscoelastic ...
    • The load/deflection behavior of pretensioned cable/pulley transmission mechanisms 

      Snow, Edward R. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1993-12)
      Mechanical transmission mechanisms enable a designer to match the abilities (e .g. velocity, torque capacity) of an actuator to the needs of an application. Unfortunately the mechanical limitations of the transmission ...
    • Lossy compression and real-time geovisualization for ultra-low bandwidth telemetry from untethered underwater vehicles 

      Murphy, Christopher A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2008-09)
      Oceanographic applications of robotics are as varied as the undersea environment itself. As underwater robotics moves toward the study of dynamic processes with multiple vehicles, there is an increasing need to distill ...
    • Low-frequency bottom backscattering data analysis using multiple constraints beamforming 

      Li, Dan (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1995-05)
      The data analysis of a deep-sea bottom backscattering experiment, carried out over a sediment pond on the western flank of the Mid-Atlantic Ridge in July 1993 with a 250- 650 Hz chirp source and a vertical receiving array ...
    • Low-latitude western north atlantic climate variability during the past millennium : insights from proxies and models 

      Saenger, Casey P. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2009-09)
      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 ...
    • A magmatic trigger for the Paleocene-Eocene Thermal Maximum? 

      Dubin, Andrea R. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2015-06)
      Fifty-six million years ago Earth experienced rapid global warming (~6°C) that was caused by the release of large amounts of carbon into the ocean-atmosphere system. This Paleocene-Eocene Thermal Maximum (PETM) is often ...
    • Magmatism and dynamics of continental breakup in the presence of a mantle plume 

      Korenaga, Jun (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2000-02)
      This thesis studies the dynamics of mantle melting during continental breakups by geophysical, geochemical, and numerical analyses. The first part focuses on the mantle melting and crustal accretion processes during the ...
    • Maintaining contact : design and use of acoustic signals in killer whales, Orcinus orca 

      Miller, Patrick J. O. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2000-09)
      This thesis presents data on the structure and use of acoustic signals produced by free-ranging resident killer whales. The analysis focuses on signal features that might be useful for animals to maintain contact and ...
    • Mantle plume-midocean ridge interaction : geophysical observations and mantle dynamics 

      Ito, Garrett T. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1996-09)
      We analyze bathymetric and gravity anomalies at five plume-ridge systems to constrain crustal and mantle density structure at these prominent oceanic features. Numerical models are then used to explore the physical ...
    • Mantle upwelling, melt generation, and magma transport beneath mid-ocean ridges 

      Magde, Laura S. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1997-03)
      The formation of new oceanic crust is the result of a complex geodynamic system in which mantle rises beneath spreading centers and undergoes decompression melting. The melt segregates from the matrix and is focused to ...