Now showing items 793-812 of 840

  • U.S. GLOBEC Georges Bank long-term moored program : part 1 - mooring configuration 

    Irish, James D.; Kerry, S.; Fucile, P.; Beardsley, Robert C.; Lord, Jeffrey; Brink, Kenneth H. (Woods Hole Oceanographic Institution, 2005-12)
    As part of the U.S. GLOBEC Northwest Atlantic/Georges Bank program, moorings were deployed on Georges Bank as part of the broad-scale survey component to help measure the temporal variability of both physical and biological ...
  • Ultimate ocean depth packaging for a digital ring laser gyroscope 

    Bowen, Martin F. (Woods Hole Oceanographic Institution, 1998-07-30)
    A Honeywell GG 1320AN Digital Ring Laser Gyroscope (RLG), typically an aviation sensor, has been adapted for use as part of a navigation package rated to ocean depths of 6,000 meters. Researchers and engineers at the Deep ...
  • Uncertainty quantification in ocean state estimation 

    Kalmikov, Alexander G. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2013-02)
    Quantifying uncertainty and error bounds is a key outstanding challenge in ocean state estimation and climate research. It is particularly difficult due to the large dimensionality of this nonlinear estimation problem ...
  • Understanding and utilizing waveguide invariant range-frequency striations in ocean acoustic waveguides 

    Cockrell, Kevin L. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2011-02)
    Much of the recent research in ocean acoustics has focused on developing methods to exploit the effects that the sea surface and seafloor have on acoustic propagation. Many of those methods require detailed knowledge of ...
  • Understanding interannual, decadal level variability in paralytic shellfish poisoning toxicity in the Gulf of Maine : the HAB Index 

    Anderson, Donald M.; Couture, Darcie A.; Kleindinst, Judith L.; Keafer, Bruce A.; McGillicuddy, Dennis J.; Martin, Jennifer L.; Richlen, Mindy L.; Hickey, J. Michael; Solow, Andrew R. (2013-09)
    A major goal in harmful algal bloom (HAB) research has been to identify mechanisms underlying interannual variability in bloom magnitude and impact. Here the focus is on variability in Alexandrium fundyense blooms and ...
  • Underwater acoustic communication over Doppler spread channels 

    Eggen, Trym H. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1997-06)
    This work is concerned with coherent communication by means of acoustic signals over underwater communication channels. The estimated scattering functions of real data ranging from the Arctic environment to tropical ...
  • Underwater optical measurement of position and orientation using a prepared, passive target 

    Nickolaisen, Niel R. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1989-09)
    In order to provide an accurate and efficient method of docking, station keeping, and navigation for the JASON remotely operated vehicle, an optical tracking method is investigated. The method needs to be accurate enough ...
  • Underwater tunable organ-pipe sound source 

    Morozov, Andrey K.; Webb, Douglas C. (Acoustical Society of America, 2007-08)
    A highly efficient frequency-controlled sound source based on a tunable high-Q underwater acoustic resonator is described. The required spectrum width was achieved by transmitting a linear frequency-modulated signal and ...
  • Universal criteria for blind deconvolution 

    Shalvi, Ofir; Weinstein, Ehud (Woods Hole Oceanographic Institution, 1990-02)
    We present necessary and sufficient conditions for blind equalization/deconvolution (without observing the input) of an unknown, possible non-minimum phase linear time invariant system (channel). Based on that, we propose ...
  • The unpredictable nature of internal tides on continental shelves 

    Nash, Jonathan D.; Kelly, Samuel M.; Shroyer, Emily L.; Moum, James N.; Duda, Timothy F. (American Meteorological Society, 2012-11)
    Packets of nonlinear internal waves (NLIWs) in a small area of the Mid-Atlantic Bight were 10 times more energetic during a local neap tide than during the preceding spring tide. This counterintuitive result cannot be ...
  • Upper mantle electrical resistivity structure beneath the central Mariana subduction system 

    Matsuno, Tetsuo; Seama, Nobukazu; Evans, Rob L.; Chave, Alan D.; Baba, Kiyoshi; White, Antony; Goto, Tada-nori; Heinson, Graham; Boren, Goran; Yoneda, Asami; Utada, Hisashi (American Geophysical Union, 2010-09-02)
    This paper reports on a magnetotelluric (MT) survey across the central Mariana subduction system, providing a comprehensive electrical resistivity image of the upper mantle to address issues of mantle dynamics in the mantle ...
  • Upward nitrate transport by phytoplankton in oceanic waters : balancing nutrient budgets in oligotrophic seas 

    Villareal, Tracy A.; Pilskaln, Cynthia H.; Montoya, Joseph P.; Dennett, Mark R. (PeerJ, 2014-03-13)
    In oceanic subtropical gyres, primary producers are numerically dominated by small (1–5 µm diameter) pro- and eukaryotic cells that primarily utilize recycled nutrients produced by rapid grazing turnover in a highly efficient ...
  • Upward swimming of competent oyster larvae Crassostrea virginica persists in highly turbulent flow as detected by PIV flow subtraction 

    Wheeler, J. D.; Helfrich, Karl R.; Anderson, Erik J.; McGann, B.; Staats, P.; Wargula, Anna E.; Wilt, K.; Mullineaux, Lauren S. (Inter-Research, 2013-08-15)
    Investigating settlement responses in the transitory period between planktonic and benthic stages of invertebrates helps shape our understanding of larval dispersal and supply, as well as early adult survival. Turbulence ...
  • Use of commercial off-the-shelf digital cameras for scientific data acquisition and scene-specific color calibration 

    Akkaynak, Derya; Treibitz, Tali; Xiao, Bei; Gurkan, Umut A.; Allen, Justine J.; Demirci, Utkan; Hanlon, Roger T. (Optical Society of America, 2014-01-20)
    Commercial off-the-shelf digital cameras are inexpensive and easy-to-use instruments that can be used for quantitative scientific data acquisition if images are captured in raw format and processed so that they maintain a ...
  • Use of SF5CF3 for ocean tracer release experiments 

    Ho, David T.; Ledwell, James R.; Smethie, William M. (American Geophysical Union, 2008-02-19)
    SF6 tracer release experiments (TREs) have provided fundamental insights in many areas of Oceanography. Recently, SF6 has emerged as a powerful transient tracer, generating a need for an alternative tracer for large-scale ...
  • Use of spectroscopy for assessment of color discrimination in animal vision 

    Akkaynak, Derya (Optical Society, 2013-12-19)
    Animals use color vision for a number of tasks including food localization, object recognition, communication, and mate selection. For these and other specific behaviors involving the use of color cues, models that quantify ...
  • Use of the distorted wave Born approximation to predict scattering by inhomogeneous objects : application to squid 

    Jones, Benjamin A.; Lavery, Andone C.; Stanton, Timothy K. (Acoustical Society of America, 2009-01)
    A new method has been developed to predict acoustic scattering by weakly scattering objects with three-dimensional variability in sound speed and density. This variability can take the form of inhomogeneities within the ...
  • Using clay to control harmful algal blooms : deposition and resuspension of clay/algal flocs 

    Beaulieu, Stace E.; Sengco, Mario R.; Anderson, Donald M. (2003-12-21)
    Harmful algal blooms (HABs) may be legitimate targets for direct control or mitigation, due to their impacts on commercial fisheries and public health. One promising control strategy is the rapid sedimentation of HABs ...
  • Variable buoyancy system metric 

    Jensen, Harold Franklin (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2009-06)
    Over the past 20 years, underwater vehicle technology has undergone drastic improvements, and vehicles are quickly gaining popularity as a tool for numerous oceanographic tasks. Systems used on the vehicle to alter buoyancy, ...
  • Verification of a six-degree of freedom simulation model for the REMUS autonomous underwater vehicle 

    Prestero, Timothy (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2001-09)
    Improving the performance of modular, low-cost autonomous underwater vehicles (AUVs) in such applications as long-range oceanographic survey, autonomous docking, and shallow-water mine countermeasures requires improving ...