Now showing items 4066-4085 of 7061

  • Modeling acoustic propagation of airgun array pulses recorded on tagged sperm whales (Physeter macrocephalus) 

    DeRuiter, Stacy L.; Tyack, Peter L.; Lin, Ying-Tsong; Newhall, Arthur E.; Lynch, James F.; Miller, Patrick J. O. (Acoustical Society of America, 2006-12)
    In 2002 and 2003, tagged sperm whales (Physeter macrocephalus) were experimentally exposed to airgun pulses in the Gulf of Mexico, with the tags providing acoustic recordings at measured ranges and depths. Ray trace and ...
  • Modeling and analysis of internal-tide generation and beamlike onshore propagation in the vicinity of shelfbreak canyons 

    Zhang, Weifeng G.; Duda, Timothy F.; Udovydchenkov, Ilya A. (American Meteorological Society, 2014-03)
    A hydrostatic numerical model with alongshore-uniform barotropic M2 tidal boundary forcing and idealized shelfbreak canyon bathymetries is used to study internal-tide generation and onshore propagation. A control simulation ...
  • Modeling and control of an autonomous underwater vehicle with combined foil/thruster actuators 

    Jakuba, Michael V. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2003-02)
    The Sentry AUV represents a radical departure from conventional AUV design, particularly with respect to actuation. The vehicle's combined foil/thruster actuators have the potential to produce a vehicle both maneuverable ...
  • Modeling and frequency tracking of marine mammal whistle calls 

    Severson, Jared (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2009-02)
    Marine mammal whistle calls present an attractive medium for covert underwater communications. High quality models of the whistle calls are needed in order to synthesize natural-sounding whistles with embedded information. ...
  • Modeling convection in the Greenland Sea 

    Bhushan, Vikas (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1998-09)
    A detailed examination of the development of a deep convection event observed in the Greenland Sea in 1988-89 is carried out through a combination of modeling, scale estimates, and data analysis. We develop a prognostic ...
  • Modeling coupled biogeochemical cycles 

    Rastetter, Edward B. (Ecological Society of America, 2011-02)
    Organisms require about 30 essential elements to sustain life. The cycles of these elements are coupled to one another through the specific physiological requirements of the organisms. Here, I contrast several approaches ...
  • Modeling deep ocean shipping noise in varying acidity conditions 

    Udovydchenkov, Ilya A.; Duda, Timothy F.; Doney, Scott C.; Lima, Ivan D. (Acoustical Society of America, 2010-08-19)
    Possible future changes of ambient shipping noise at 0.1–1 kHz in the North Pacific caused by changing seawater chemistry conditions are analyzed with a simplified propagation model. Probable decreases of pH would cause ...
  • Modeling denitrification in aquatic sediments 

    Fennel, Katja; Brady, Damian; DiToro, Dominic; Fulweiler, Robinson W.; Gardner, Wayne S.; Giblin, Anne E.; McCarthy, Mark J.; Rao, Alexandra; Seitzinger, Sybil P.; Thouvenot-Korppoo, Marie; Tobias, Craig R. (2008-10-10)
    Sediment denitrification is a major pathway of fixed nitrogen loss from aquatic systems. Due to technical difficulties in measuring this process and its spatial and temporal variability, estimates of local, regional and ...
  • Modeling of monostatic bottom backscattering from three-dimensional volume inhomogeneities and comparisons with experimental data 

    Li, Dan (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1997-09)
    Acoustic propagation in the ocean inevitably encounters inhomogeneities of various types, which give rise to scattering. Acoustic scattering from rough water /bottom interfaces comprised of exposed rocks and sea mountains ...
  • Modeling sea surface scattering by the time-domain finite-difference method 

    Stephen, Ralph A. (Acoustical Society of America, 1996-10)
    A numerical scattering chamber based on the time-domain finite-difference solution of the two-way elastic wave equation is applied to a sea surface scattering problem, and excellent agreement is obtained in amplitude and ...
  • Modeling seafloor geoacoustic interaction with a numerical scattering chamber 

    Stephen, Ralph A.; Swift, Stephen A. (Acoustical Society of America, 1994-08)
    A numerical scattering chamber (NSC) has been developed to compute backscatter functions for geologically realistic seafloor models. In the NSC, solutions are computed to the elastic (or anelastic) wave equation by the ...
  • A modeling study of acoustic propagation through moving shallow-water solitary wave packets 

    Duda, Timothy F.; Preisig, James C. (IEEE, 1999-01)
    Propagation of 400-Hz sound through continental-shelf internal solitary wave packets is shown by numerical simulation to be strongly influenced by coupling of normal modes. Coupling in a packet is controlled by the mode ...
  • A modeling study of the seasonal oxygen budget of the global ocean 

    Jin, X.; Najjar, Raymond G.; Louanchi, F.; Doney, Scott C. (American Geophysical Union, 2007-05-09)
    An ecosystem model embedded in a global ocean general circulation model is used to quantify roles of biological and physical processes on seasonal oxygen variations. We find that the thermally induced seasonal net outgassing ...
  • Modeling sulfate reduction in methane hydrate-bearing continental margin sediments : does a sulfate-methane transition require anaerobic oxidation of methane? 

    Malinverno, Alberto; Pohlman, John W. (American Geophysical Union, 2011-07-12)
    The sulfate-methane transition (SMT), a biogeochemical zone where sulfate and methane are metabolized, is commonly observed at shallow depths (1–30 mbsf) in methane-bearing marine sediments. Two processes consume sulfate ...
  • Modeling surf zone tracer plumes : 1. Waves, mean currents, and low-frequency eddies 

    Feddersen, Falk; Clark, David B.; Guza, R. T. (American Geophysical Union, 2011-11-18)
    A model that accurately simulates surf zone waves, mean currents, and low-frequency eddies is required to diagnose the mechanisms of surf zone tracer transport and dispersion. In this paper, a wave-resolving time-dependent ...
  • Modeling surf zone tracer plumes : 2. Transport and dispersion 

    Clark, David B.; Feddersen, Falk; Guza, R. T. (American Geophysical Union, 2011-11-18)
    Five surf zone dye tracer releases from the HB06 experiment are simulated with a tracer advection diffusion model coupled to a Boussinesq surf zone model (funwaveC). Model tracer is transported and stirred by currents and ...
  • Modeling the global ocean iron cycle 

    Parekh, Payal; Follows, Michael J.; Boyle, Edward A. (American Geophysical Union, 2004-01-07)
    We describe a model of the ocean transport and biogeochemical cycling of iron and the subsequent control on export production and macronutrient distributions. Ocean transport of phosphorus and iron are represented by a ...
  • Modeling the impact of declining sea ice on the Arctic marine planktonic ecosystem 

    Zhang, Jinlun; Spitz, Yvette H.; Steele, Michael; Ashjian, Carin J.; Campbell, Robert G.; Berline, Leo; Matrai, Patricia (American Geophysical Union, 2010-10-08)
    We have developed a coupled 3-D pan-Arctic biology/sea ice/ocean model to investigate the impact of declining Arctic sea ice on the marine planktonic ecosystem over 1988–2007. The biophysical model results agree with ...
  • Modeling the processes affecting larval haddock (Melanogrammus aeglefinus) survival on Georges Bank 

    Petrik, Colleen M. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2011-02)
    The ultimate goal of early life studies of fish over the past century has been to better understand recruitment variability. Recruitment is the single most important natural event controlling year-class strength and ...
  • Modeling the Total Allowable Area for Coastal Reclamation : a case study of Xiamen, China 

    Peng, Benrong; Lin, Chenchen; Jin, Di; Rao, Huanhuan; Jiang, Yuwu; Liuc, Yan (2013-03)
    This paper presents an analytical framework to estimate the Total Allowable Area for Coastal Reclamation (TAACR) to provide scientific support for the implementation of a coastal reclamation restriction mechanism. The logic ...