Now showing items 674-693 of 860

  • Robust acoustic signal detection and synchronization in a time varying ocean environment 

    Gieleghem, Ryan T. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2012-09)
    Signal detection and synchronization in the time varying ocean environment is a difficult endeavor. The current common methods include using a linear frequency modulated chirped pulse or maximal length sequence as a detection ...
  • The role of biological production in pleistocene atmospheric carbon dioxide variations and the nitrogen isotope dynamics of the southern ocean 

    Sigman, Daniel M. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1997-09)
    This dissertation contributes to the search for a cause of glacial/interglacial variations in atmospheric carbon dioxide. The hypotheses addressed involve changes in low and high-latitude biological export production. A ...
  • The role of colloidal organic matter in the marine geochemistry of PCB’s 

    Brownawell, Bruce J. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1986-04)
    Polychlorinated biphenyls (PCBs) were used as model hydrophobic organic compounds (HOC) to study physical~chemical processes which affect the speciation and fate of HOC in coastal environments. The focus of this study ...
  • The role of denitrification in the nitrogen cycle of New England salt marshes 

    Hamersley, Michael R. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2001-12)
    I used direct measurements of nitrogen gas (N2) fluxes and a 15N stable isotope tracer to determine the contribution of denitrification to salt marsh sediment N cycling. Denitrification in salt marsh tidal creekbottoms ...
  • The role of heterotrophic microflagellates in plankton communities 

    Caron, David A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1984-06)
    The distribution and feeding behavior of bacterivorous micro flagellates (2-20 μm protozoa) and their ingestion by copepods were examined in an attempt to assess the importance of these protozoa as a trophic link ...
  • The role of sulfur in salt marsh metabolism 

    Howarth, Robert W. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1979-02)
    The rate of sulfate reduction in stands of dwarf Spartina alterniflora in the Great Sippewissett Salt Marsh is approximately 75 moles S04 m2 year-1. This is the highest rate reported for any natural ecosystem. Sulfate ...
  • Rotating convection driven by differential bottom heating and its application 

    Park, Young-Gyu (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1996-09)
    A convection experiment was done with a rotating rectangular tank as a model of oceanic meridional overturning circulation. Heat flux was fixed at one bottom end of the tank using an electrical heater. Temperature was ...
  • 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 ...
  • Seasonal and interannual variability in the hydrology and geochemistry of an outlet glacier of the Greenland Ice Sheet 

    Linhoff, Benjamin S. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2016-02)
    In the spring and summer within the ablation zone of the Greenland Ice Sheet (GrIS), meltwater drains to the ice sheet bed through an evolving network of efficient channelized and inefficient distributed drainage systems. ...
  • 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 ...