Now showing items 4378-4397 of 7623

    • 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 ...
    • Modeling transport and fate of riverine dissolved organic carbon in the Arctic Ocean 

      Manizza, Manfredi; Follows, Michael J.; Dutkiewicz, Stephanie; McClelland, James W.; Menemenlis, Dimitris; Hill, C. N.; Townsend-Small, Amy; Peterson, Bruce J. (American Geophysical Union, 2009-10-07)
      The spatial distribution and fate of riverine dissolved organic carbon (DOC) in the Arctic may be significant for the regional carbon cycle but are difficult to fully characterize using the sparse observations alone. ...
    • Modeling turbulent dispersion on the North Flank of Georges Bank using Lagrangian Particle Methods 

      Proehl, Jeffrey A.; Lynch, Daniel R.; McGillicuddy, Dennis J.; Ledwell, James R. (2004-09-29)
      Circulation and transport at the North Flank of Georges Bank are studied using a data-assimilative 3-D model of frontal dynamics under stratified, tidally energetic conditions over steep topography. The circulation model ...
    • Modeling weak fluctuations of undersea telemetry signals 

      Duda, Timothy F. (IEEE, 1991-01)
      Numerical calculation of acoustic field perturbation expressions can be used to predict fluctuations after propagation through ocean sound-speed structures, but before the onset of multipath. The general form of the ...
    • Modeling wind forcing in phase resolving simulation of nonlinear wind waves 

      Kalmikov, Alexander G. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2010-02)
      Wind waves in the ocean are a product of complex interaction of turbulent air flow with gravity driven water surface. The coupling is strong and the waves are non-stationary, irregular and highly nonlinear, which restricts ...