Now showing items 370-389 of 938

    • Gas hydrate measurements at Hydrate Ridge using Raman spectroscopy 

      Hester, K. C.; Dunk, R. M.; White, Sheri N.; Brewer, Peter G.; Peltzer, Edward T.; Sloan, E. D. (2006-11-14)
      Oceanic gas hydrates have been measured near the seafloor for the first time using a seagoing Raman spectrometer at Hydrate Ridge, Oregon, where extensive layers of hydrates have been found to occur near the seafloor. All ...
    • Genomic and transcriptomic evidence for scavenging of diverse organic compounds by widespread deep-sea archaea 

      Li, Meng; Baker, Brett J.; Anantharaman, Karthik; Jain, Sunit; Breier, John A.; Dick, Gregory J. (Nature Publishing Group, 2015-11-17)
      Microbial activity is one of the most important processes to mediate the flux of organic carbon from the ocean surface to the seafloor. However, little is known about the microorganisms that underpin this key step of the ...
    • Geoacoustic inversion by mode amplitude perturbation 

      Poole, Travis L. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2007-02)
      This thesis introduces an algorithm for inverting for the geoacoustic properties of the seafloor in shallow water. The input data required by the algorithm are estimates of the amplitudes of the normal modes excited by ...
    • Geoacoustic inversion by mode amplitude perturbation 

      Poole, Travis L.; Frisk, George V.; Lynch, James F.; Pierce, Allan D. (Acoustical Society of America, 2008-02)
      This paper introduces a perturbative inversion algorithm for determining sea floor acoustic properties, which uses modal amplitudes as input data. Perturbative inverse methods have been used in the past to estimate bottom ...
    • Geoacoustic inversion by mode amplitude perturbation 

      Poole, Travis L.; Frisk, George V.; Lynch, James F.; Pierce, Allan D. (Acoustical Society of America, 2008-02)
      This paper introduces a perturbative inversion algorithm for determining sea floor acoustic properties, which uses modal amplitudes as input data. Perturbative inverse methods have been used in the past to estimate bottom ...
    • Geoacoustic inversion in laterally varying shallow-water environments using high-resolution wavenumber estimation 

      Becker, Kyle M. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2002-02)
      Sound propagation in shallow water is highly dependent on the interaction of the sound field with the bottom. In order to fully understand this problem, it is necessary to obtain reliable estimates of bottom geoacoustic ...
    • Geophysical evidence from the MELT area for compositional controls on oceanic plates 

      Evans, Rob L.; Hirth, Greg; Baba, Kiyoshi; Forsyth, Donald W.; Chave, Alan D.; Mackie, Randall L. (2005-06-29)
      Magnetotelluric (MT) and seismic data, collected during the MELT experiment at the Southern East Pacific Rise (SEPR) constrain the distribution of melt beneath this mid-ocean-ridge spreading center and also the evolution ...
    • Geophysical modeling of collapse-prone zones at Rumble III seamount, southern Pacific Ocean, New Zealand 

      Tontini, F. Caratori; de Ronde, Cornel E. J.; Kinsey, James C.; Soule, Samuel A.; Yoerger, Dana R.; Cocchi, L. (John Wiley & Sons, 2013-10-18)
      Catastrophic collapses of submarine volcanoes have the potential to generate major tsunami, threatening many coastal populations. Recognizing the difficulties surrounding anticipations of these events, quantitative assessment ...
    • Georges Bank : a leaky incubator of Alexandrium fundyense blooms 

      McGillicuddy, Dennis J.; Townsend, David W.; Keafer, Bruce A.; Thomas, Maura A.; Anderson, Donald M. (2012-09-21)
      A series of oceanographic surveys on Georges Bank document variability of populations of the toxic dinoflagellate Alexandrium fundyense on time scales ranging from synoptic to seasonal to interannual. Blooms of A. fundyense ...
    • Graphical model driven methods in adaptive system identification 

      Yellepeddi, Atulya (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2016-09)
      Identifying and tracking an unknown linear system from observations of its inputs and outputs is a problem at the heart of many different applications. Due to the complexity and rapid variability of modern systems, there ...
    • Habitat usage by the cryptic copepods Pseudocalanus moultoni and P. newmani on Georges Bank (Northwest Atlantic) 

      Bucklin, Ann; McGillicuddy, Dennis J.; Wiebe, Peter H.; Davis, Cabell S. (2015-10-04)
      The cryptic copepod species, Pseudocalanus moultoni and P. newmani, co-occur on Georges Bank and in the Gulf of Maine (Northwest Atlantic); even recent studies have reported results and conclusions based on examination ...
    • Hand tools and mechanical accessories for a deep submersible 

      Winget, Clifford L. (Woods Hole Oceanographic Institution, 1969-05)
      This report presents the design and construction details for various mechanical hand tools and accessories used by a manned deep submersible. The tools require the use of a mechanical manipulator, and were designed specifically ...
    • Handbook of oceanographic engineering materials : volume I - metals and alloys 

      Dexter, Stephen C. (Woods Hole Oceanographic Institution, 1972-12)
      This handbook is intended to serve as an aid in materials selection to Oceanographic engineers and designers. As such it is intentionally limited to materials that may be used advantageously in the marine environment.
    • Heave and roll response of free floating bodies of cylindrical shape 

      Berteaux, Henri O.; Goldsmith, Roger A.; Schott, W. E. (Woods Hole Oceanographic Institution, 1977-02)
      The following report describes a computer solution to help predict the heave and roll response of free floating bodies of cylindrical shape when excited by random seas with known spectra. The basic concepts of harmonic ...
    • High continuous bandwidth multichannel acquisition system 

      von der Heydt, Keith (Woods Hole Oceanographic Institution, 1991-06)
      Multichannel data acquisition has been a keystone of 7 ONR sponsored Arctic acoustic research programs conducted jointly by WHOI and MIT investigators from 1978 through 1989. This report describes the status and capability ...
    • The high speed buffer board : a SAIL EIA-485 communications accelerator card for the vector measuring current meter 

      Singer, Robin C.; Butler, Douglas M. (Woods Hole Oceanographic Institution, 1990-07)
      A High Speed Buffer Board (HSBB) has been developed for the Vector Measuring Current Meter (VMCM) to implement the transmission of data at 9600 baud over an EIA-485 link. The HSBB significantly extends the VMCM communication ...
    • High-frequency acoustic scattering from turbulent oceanic microstructure : the importance of density fluctuations 

      Lavery, Andone C.; Schmitt, Raymond W.; Stanton, Timothy K. (Acoustical Society of America, 2003-11)
      Acoustic scattering techniques provide a unique and powerful tool to remotely investigate the physical properties of the ocean interior over large spatial and temporal scales. With high-frequency acoustic scattering it is ...
    • High-frequency bistatic scattering by sub-bottom gas bubbles 

      Chu, Dezhang; Williams, Kevin L.; Tang, Dajun; Jackson, Darrell R. (Acoustical Society of America, 1997-08)
      A previous study of high-frequency acoustic backscattering data collected at Eckernfoerde Bay, Germany revealed that scattering is mainly due to methane gas bubbles buried about a meter beneath the seafloor [Tang et al., ...
    • High-resolution mapping of mines and ripples at the Martha's Vineyard Coastal Observatory 

      Mayer, Larry A.; Raymond, Richard; Glang, Gerd; Richardson, Michael D.; Traykovski, Peter A.; Trembanis, Arthur C. (IEEE, 2007-01)
      High-resolution multibeam sonar and state-of-the- art data processing and visualization techniques have been used to quantify the evolution of seafloor morphology and the degree of burial of instrumented mines and mine-shapes ...
    • High-resolution numerical modeling of wave-supported gravity-driven mudflows 

      Hsu, Tian-Jian; Ozdemir, Celalettin E.; Traykovski, Peter A. (American Geophysical Union, 2009-05-14)
      Wave-supported gravity-driven mudflow has been identified as a major offshore fine sediment transport mechanism of terrestrial sediment into the coastal ocean. This transport process essentially occurs within the wave ...