Now showing items 457-476 of 860

  • 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 ...
  • The marine biogeochemistry of dissolved and colloidal Iron 

    Fitzsimmons, Jessica N. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2013-09)
    Iron is a redox active trace metal micronutrient essential for primary production and nitrogen acquisition in the open ocean. Dissolved iron (dFe) has extremely low concentrations in marine waters that can drive phytoplankton ...
  • The marine biogeochemistry of molybdenum 

    Tuit, Caroline Beth (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2003-02)
    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 ...
  • The marine biogeochemistry of zinc isotopes 

    John, Seth G. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2007-06)
    Zinc (Zn) stable isotopes can record information about important oceanographic processes. This thesis presents data on Zn isotopes in anthropogenic materials, hydrothermal fluids and minerals, cultured marine phytoplankton, ...
  • The marine geochemistry of iron and iron isotopes 

    Bergquist, Bridget A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2004-09)
    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 ...
  • The marine geochemistry of methane 

    Scranton, Mary Isabelle (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1977-08)
    In the highly productive coastal surface waters near Walvis Bay, methane is present in concentrations considerably above those which would be predicted from solubility equilibrium with the atmosphere. A one dimensional ...
  • The marine geochemistry of the rare earth elements 

    Baar, Hein J. W. de (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1983-09)
    Novel methods were developed for the determination of 12 of the 14 Rare Earth Elements (REE) in seawater. Initial extractions of the REE by chelating ion exchange chromatography is followed by cation exchange for removal ...
  • The marine geochemistry of thorium and protactinium 

    Anderson, Robert F. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1980-11)
    Suspended particulate matter was collected by sediment traps deployed in the Sargasso Sea (Site S2), the north equatorial Atlantic (Site E), the north equatorial Pacific (Site P), and the Panama Basin (STIE Site). Additional ...
  • The marine geochemistry of trace metals 

    Boyle, Edward A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1976-04)
    The marine geochemical cycles of iron, copper, nickel, and cadmium were studied in order to provide a basis for oceanographic models for trace metals. Copper, nickel, and cadmium can be determined in a 100 ml seawater ...