Now showing items 668-687 of 845

  • Sands and environmental conditions impact the abundance and persistence of the fecal indicator bacteria Enterococcus at recreational beaches 

    Halliday, Elizabeth (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2012-09)
    The marine fecal indicator Enterococcus is measured at beaches to detect fecal contamination events, and beaches are closed to bathers when Enterococcus is found to exceed the federally mandated limit. This dissertation ...
  • Satellite-derived sea surface temperature, mesoscale variability, and foraminiferal production in the North Atlantic 

    Wolfteich, Carl M. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1994-02)
    Planktonic foraminiferal flux was collected at four sediment trap locations spanning a 34° latitude range in the North Atlantic during 1988-1990. Satellite-derived sea surface temperature (SST) and CTD data were integrated ...
  • Scale closure in upper ocean optical properties : from single particles to ocean color 

    Green, Rebecca E. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2002-06)
    Predictions of chlorophyll concentration from satellite ocean color are an indicator of phytoplankton primary productivity, with implications for foodweb structure, fisheries, and the global carbon cycle. Current models ...
  • Scattering of coastal-trapped waves by irregularities in coastline and topography 

    Wilkin, John L. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1988-09)
    A study is conducted of the scattering of freely-propagating subinertial frequency coastal-trapped waves (CTWS) by large variations in coastline and topography using analytical and numerical techniques. Particular attention ...
  • Scattering of the low-mode internal tide at the Line Islands Ridge 

    Haji, Maha N. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2015-02)
    The scattering of low-mode internal tides by ocean-floor topography is extensively studied through analytical models and field observations at the Line Islands Ridge (LIR). An existing Green function method is utilized ...
  • Seafloor ripples created by waves from Hurricane Ivan on the west Florida shelf 

    Bowers, Colleen Marie (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2006-09)
    Recent studies have shown that the presence of sand ripples on the seabed improves sonar detection of buried mines at sub-critical angles. Sidescan sonar data of ripples on the west Florida shelf were collected as part ...
  • A search for layering in the oceanic crust 

    Collins, John A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1988-10-06)
    The results of numerous seismic refraction and reflection experiments have shown that the seismic structure of the oceanic crust can be usefully parameterized by a small number of locally horizontal layers within which ...
  • Search methods for an autonomous underwater vehicle using scalar measurements 

    Burian, Erik A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1996-07-18)
    The continuing development of the autonomous underwater vehicle as an oceanographic research tool has opened up the realm of scientific possibility in the field of deep ocean research. The ability of a vehicle to travel ...
  • The seasonal and interannual variability of the West Greenland Current system in the Labrador Sea 

    Rykova, Tatiana A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2010-06)
    The Labrador Sea, as one of a few places of deep water formation, plays an important role in the Meridional Overturning Circulation. While the interior of the Labrador Sea, where the deepest convection takes place, is ...
  • Seasonal oscillations in a mid-latitude ocean with barriers to deep flow 

    Firing, Eric (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1978-08)
    A two-layer linear analytic model is used to study the response of the mid-latitude ocean to the seasonal variation of the windstress. The most important component of the response is a barotropic quasi-steady Sverdrup ...
  • Seasonal variability in the intermediate water of the eastern North Atlantic 

    Bray, Nancy Amanda (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1980-08)
    Observational evidence of seasonal variability below the main thermocline in the eastern North Atlantic is described, and a theoretical model of oceanic response to seasonally varying windstress forcing is constructed to ...
  • Sediment deposition in the lower Hudson River estuary 

    Woodruff, Jonathan D. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1999-09)
    This study uses geophysical and sedimentological data collected from the Lower Hudson River estuary to identify the depositional response of the estuary to high river discharge events. Erosional and depositional environments ...
  • Sedimentary lipids as indicators of depositional conditions in the coastal Peruvian upwelling regime 

    McCaffrey, Mark A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1990-05)
    This thesis assesses the utility of various sedimentary lipids as indicators of short-term changes in depositional conditions and sedimentary organic matter sources in the coastal upwelling regime off of Peru. A variety ...
  • Sedimentary processes on the continental slope off New England 

    MacIlvaine, Joseph Chad (Woods Hole Oceanographic Institution, 1973-09)
    A detailed study of a small (5000 km2) area of the continental slope south of Cape Cod, Massachusetts, was conducted. Bathymetry, 3.5 kHz profiles, seismic profiles, suspended sediment analysis, bottom photographs, television ...
  • Seismic and gravitational studies of melting in the mantle's thermal boundary layers 

    Van Ark, Emily M. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2007-06)
    This thesis presents three studies which apply geophysical tools to the task of better understanding mantle melting phenomena at the upper and lower boundaries of the mantle. The first study uses seafloor bathymetry and ...
  • Seismic and magnetic constraints on the structure of upper oceanic crust at fast and slow spreading ridges 

    Hussenoeder, Stefan A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1998-09)
    The upper ocean crust contains a comprehensive record of the shallow geological processes active along the world's mid-ocean ridge system. This thesis examines the magnetic and seismic structure of the upper crust at two ...
  • The seismic attenuation structure of the East Pacific Rise 

    Wilcock, William S. D. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1992-06)
    Studies of seismic propagation through oceanic crust have contributed enormously to our understanding of the generation and evolution of oceanic crust However, such work has largely been confined to the seismic velocity ...
  • Seismic constraints on shallow crustal processes at the East Pacific Rise 

    Christeson, Gail L. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1994-02)
    This thesis is concerned with understanding how oceanic crust is emplaced at mid-ocean ridges. The emphasis is upon fast-spreading ridges, and the use of seismic techniques to image the uppermost several hundred meters ...
  • Seismic scattering of low-grazing-angle acoustic waves incident on the seafloor 

    Greaves, Robert J. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1998-06)
    The goal of this thesis is to develop a methodology to interpret sound scattered from the seafloor in terms of seafloor structure and subseafloor geological properties. Specifically, this work has been directed towards ...
  • Seismicity and structure of the Orozco transform fault from ocean bottom seismic observations 

    Trehu, Anne M. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1982-02)
    In this thesis, seismic waves generated by sources ranging from 2.7 kg shots of TNT to magnitude 5 earthquakes are studied in order to determine the seismic activity and crustal structure of the Orozco transform fault. ...