Now showing items 645-664 of 900

    • The physiology of dormancy and germination in cysts of the marine dinoflagellate Scrippsiella trochoidea 

      Binder, Brian Jeffrey (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1986-02)
      Cysts of Scrippsiella trochoidea are representative of the thick-walled non-motile resting cells produced by many dinoflagellates. Although the influence of cysts on the biology and ecology of dinoflagellates may be ...
    • Phytoplankton growth and diel variations in beam attenuation through individual cell analysis 

      DuRand, Michele D. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1995-09)
      A number of investigators have observed diel variations in the bulk water inherent optical property beam attenuation, with a minimum near dawn and a maximum near dusk, and have assumed them to be caused by the phytoplankton. ...
    • Picophytoplankton photoacclimation and mixing in the surface oceans 

      Dusenberry, Jeffrey A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1995-02)
      Fluctuations in light intensity due to vertical mixing in the open ocean surface layer will affect phytoplankton physiology. Conversely, indicators of phytoplankton photoacclimation will be diagnostic of mixing processes ...
    • Plagioclase preferred orientation in layered mylonites : evaluation of flow laws for the lower crust 

      Mehl, Luc (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2008-02)
      We evaluate the applicability of plagioclase and gabbro flow laws by comparing predicted and observed deformation mechanisms in gabbroic shear zones. Gabbros and layered gabbro mylonites were collected from the Southwest ...
    • Plan-view evolution of wave-dominated deltas 

      Nienhuis, Jaap H. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2016-02)
      Ocean waves are a powerful sediment transport mechanism in the coastal zone. This thesis investigates how waves shape deltaic landforms and how small scale river mouth processes affect large-scale delta morphology. I ...
    • Planktonic foraminifera in the sea of Okhotsk : population and stable isotopic analysis from a sediment trap 

      Alderman, Susan E. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1996-05)
      The relationship of planktonic foraminiferal populations and stable isotopes to synoptic sea surface temperatures (SST's) was examined in the Sea of Okhotsk, using sediment trap samples (trap deployed Aug. '90 - Aug. ...
    • Plume-lithosphere interaction : geochemical evidence from upper mantle and lower crusal Xenoliths from the Kerguelen Islands 

      Hassler, Deborah R. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1999-06)
      This study is a geochemical investigation ofthe evolution of the Kerguelen plume, on the basis of upper mantle and lower crustal xenoliths. Ultramafic xenoliths include harzburgites predominant, a lherzolite, dunites and ...
    • Plutonium isotopes in the North Atlantic 

      Buesseler, Ken O. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1986-09)
      The artificial radionuclide Plutonium (Pu) has been introduced into the environment primarily as fallout from atmospheric nuclear weapons testing during the 1950's and 1960's. Earlier studies of Pu geochemistry are ...
    • Population dynamics and diversity of Synechococcus on the New England Shelf 

      Hunter-Cevera, Kristen R. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2014-09)
      Synechococcus is a ubiquitous marine primary producer. Our understanding of the factors that determine its abundance has been limited by available observational tools, which have not been able to resolve population ...
    • Predicting eddy detachment from thin jets 

      Ralph, Elise A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1991-08)
      Using a semi-geostrophic, reduced gravity thin jet model, we analytically study the evolution of initial meanders into pinched-off rings. The model used is similar to the path equation developed by Flierl and Robinson ...
    • Prediction of continental shelf sediment transport using a theoretical model of the wave-current boundary layer 

      Goud, Margaret R. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1987-09)
      This thesis presents an application of the Grant-Madsen-Glenn bottom boundary layer model (Grant and Madsen, 1979; Glenn and Grant, 1987) to predictions of sediment transport on the continental shelf. The analysis is a ...
    • Predictions and observations of seafloor infrasonic noise generated by sea surface orbital motion 

      Lindstrom, Timothy E. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1991-09)
      A model is developed for the prediction of the seismo-acoustic noise spectrum in the microseism peak region (0.1 to 0.7 Hz). The model uses a theory developed by Cato [J. Acoust. Soc. Am., 89 , 1096-1112 (1991)] for an ...
    • Primary production of particulate protein amino acids : algal protein metabolism and its relationship to the composition of particulate organic matter 

      Lohrenz, Steven E. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1985-04)
      The biochemical and physiological bases underlying primary production of particulate protein amino acids were investigated in an effort to understand the relationship between algal protein metabolism and particulate organic ...
    • A probabilistic evaluation of tank ship damage in grounding events 

      Rawson, Charles E. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1998-06)
      Recent international and domestic regulatory actions have resulted in significant changes to oil tanker designs and intensified attention on predicting tanker environmental performance following groundings or collisions. ...
    • Probabilistic evaluation of tankship damage in collision events 

      Crake, Kurtis W. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1998-06)
      An analytical method for precidicting the extent of damage in ship collisions is developed. The method calculates both the longitudinal and transverse extents of damage for the struck ship as a function of collision ...
    • Production and analysis of a Southern Ocean state estimate 

      Mazloff, Matthew R. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2006-09)
      A modern general circulation model of the Southern Ocean with one-sixth of a degree resolution is optimized to the observed ocean in a weighted least squares sense. Convergence toward the state estimate solution is carried ...
    • The production of temperature and salinity variance and covariance : implications for mixing 

      Schanze, Julian J. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2013-02)
      Large-scale thermal forcing and freshwater fluxes play an essential role in setting temperature and salinity in the ocean. A number of recent estimates of the global oceanic freshwater balance as well as the global oceanic ...
    • Productivity, metabolism and physiology of free-living chemoautotrophic Epsilonproteobacteria 

      McNichol, Jesse C. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2016-09)
      Chemoautotrophic ecosystems at deep-sea hydrothermal vents were discovered in 1977, but not until 1995 were free-living autotrophic Epsilonproteobacteria identified as important microbial community members. Because the ...
    • Progressively communicating rich telemetry from autonomous underwater vehicles via relays 

      Murphy, Christopher A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2012-06)
      As analysis of imagery and environmental data plays a greater role in mission construction and execution, there is an increasing need for autonomous marine vehicles to transmit this data to the surface. Without access ...
    • A prony algorithm for shallow water waveguide analysis 

      Diemer, Ferdinand J. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1987-08)
      Low frequency acoustic propagation in shallow water is examined from a normal mode context. By modelling the far field pressure field as a modal sum, propagating mode characteristics of wavenumber, initial phase, attennation ...