Now showing items 1574-1593 of 5320

    • Estimating nearshore bedform amplitudes with altimeters 

      Gallagher, E. L.; Elgar, Steve; Guza, R. T.; Thornton, Ed B. (2005-01-14)
      Estimates of the heights of large (0.1-0.4 m heights and 1-10 m horizontal lengths) migrating bedforms on a sandy beach made with fixed, single-point altimeters are similar to heights estimated from profiles across the ...
    • Estimating ocean heat transports and submarine melt rates in Sermilik Fjord, Greenland, using lowered acoustic Doppler current profiler (LADCP) velocity profiles 

      Sutherland, David A.; Straneo, Fiamma (International Glaciological Society, 2012-11-01)
      Submarine melting at the ice-ocean interface is a significant term in the mass balance of marine-terminating outlet glaciers. However, obtaining direct measurements of the submarine melt rate, or the ocean heat transport ...
    • Estimating oceanic turbulence dissipation from seismic images 

      Holbrook, W. Steven; Fer, Ilker; Schmitt, Raymond W.; Lizarralde, Daniel; Klymak, Jody M.; Helfrich, L. Cody; Kubichek, Robert (American Meteorological Society, 2013-08)
      Seismic images of oceanic thermohaline finestructure record vertical displacements from internal waves and turbulence over large sections at unprecedented horizontal resolution. Where reflections follow isopycnals, their ...
    • Estimating open-ocean boundary conditions : sensitivity studies 

      Gunson, James R. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1995-08)
      The problem of estimating boundary and initial conditions for a regional open-ocean model is addressed here. With the objective of mimicking the SYNOP experiment in the Gulf Stream system, a meandering jet is modeled by ...
    • Estimating phytoplankton growth rates from compositional data 

      Thomas, Lorraine (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2008-02)
      I build on the deterministic phytoplankton growth model of Sosik et al. by introducing process error, which simulates real variation in population growth and inaccuracies in the structure of the matrix model. Adding a ...
    • Estimating sea-ice coverage, draft, and velocity in Marguerite Bay (Antarctica) using a subsurface moored upward-looking acoustic Doppler current profiler (ADCP) 

      Hyatt, Jason; Visbeck, Martin; Beardsley, Robert C.; Owens, W. Brechner (2007-09-14)
      A technique for the analysis of data from a subsurface moored upward-looking acoustic Doppler current profiler (ADCP) to determine ice coverage, draft and velocity is presented and applied to data collected in Marguerite ...
    • Estimating the benthic efflux of dissolved iron on the Ross Sea continental shelf 

      Marsay, Christopher M.; Sedwick, Peter N.; Dinniman, M. S.; Barrett, P. M.; Mack, S. L.; McGillicuddy, Dennis J. (John Wiley & Sons, 2014-11-03)
      Continental margin sediments provide a potentially large but poorly constrained source of dissolved iron (dFe) to the upper ocean. The Ross Sea continental shelf is one region where this benthic supply is thought to play ...
    • Estimating the economic benefits of regional ocean observing systems 

      Kite-Powell, Hauke L.; Colgan, Charles S.; Wellman, Katharine F.; Pelsoci, Thomas; Wieand, Kenneth; Pendleton, Linwood; Kaiser, Mark J.; Pulsipher, Allan G.; Luger, Michael (Woods Hole Oceanographic Institution, 2005-04)
      We develop a methodology to estimate the potential economic benefits from new investments in regional coastal ocean observing systems in US waters, and apply this methodology to generate preliminary estimates of such ...
    • Estimating the horizontal and vertical direction-of-arrival of water-borne seismic signals in the northern Philippine Sea 

      Freeman, Simon E.; D'Spain, Gerald L.; Lynch, Stephen D.; Stephen, Ralph A.; Heaney, Kevin D.; Murray, James J.; Baggeroer, Arthur B.; Worcester, Peter F.; Dzieciuch, Matthew A.; Mercer, James A. (Acoustical Society of America, 2013-10)
      Conventional and adaptive plane-wave beamforming with simultaneous recordings by large-aperture horizontal and vertical line arrays during the 2009 Philippine Sea Engineering Test (PhilSea09) reveal the rate of occurrence ...
    • Estimating the predictability of an oceanic time series using linear and nonlinear methods 

      Yuan, Guo-Cheng; Lozier, M. Susan; Pratt, Lawrence J.; Jones, C. K. R. T.; Helfrich, Karl R. (American Geophysical Union, 2004-08-03)
      This study establishes a series of tests to examine the relative utility of nonlinear time series analysis for oceanic data. The performance of linear autoregressive models and nonlinear delay coordinate embedding methods ...
    • Estimating westslope cutthroat trout (Oncorhynchus clarkii lewisi) movements in a river network using strontium isoscapes 

      Muhlfeld, Clint C.; Thorrold, Simon R.; McMahon, Thomas E.; Marotz, Brian (NRC Research Press, 2012-04-20)
      We used natural variation in the strontium concentration (Sr:Ca) and isotope composition (87Sr:86Sr) of stream waters and corresponding values recorded in otoliths of westslope cutthroat trout (Oncorhynchus clarkii lewisi) ...
    • Estimation and correction of geometric distortions in side-scan sonar images 

      Cobra, Daniel Távora de Queiroz (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1990-03)
      This thesis introduces a new procedure for the enhancement of acoustic images of the bottom of the sea produced by side-scan sonars. Specifically, it addresses the problem of estimating and correcting geometric distortions ...
    • Estimation and tracking of rapidly time-varying broadband acoustic communication channels 

      Li, Weichang (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2006-02)
      This thesis develops methods for estimating wideband shallow-water acoustic communication channels. The very shallow water wideband channel has three distinct features: large dimension caused by extensive delay spread; ...
    • Estimation of mixed-layer depth from surface parameters 

      Swain, D.; Ali, M. M.; Weller, Robert A. (Sears Foundation for Marine Research, 2006-09)
      Mixed layer depth (MLD) is an important oceanographic parameter. However, the lack of direct observations of MLD hampers both specification and investigation of its spatial and temporal variability. An important alternative ...
    • Estimation of ocean subsurface thermal structure from surface parameters : a neural network approach 

      Ali, M. M.; Swain, D.; Weller, Robert A. (American Geophysical Union, 2004-10-22)
      Satellite remote sensing provides diverse and useful ocean surface observations. It is of interest to determine if such surface observations can be used to infer information about the vertical structure of the ocean's ...
    • Estimation of planetary wave parameters from the data of the 1981 ocean acoustic tomography experiment 

      Chiu, Ching-Sang (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1985-08)
      Using the maximum-likelihood estimation method and minimization techniques, quasi-geostrophic wave solutions were fitted to the observations of the 1981 Ocean Acoustic Tomography Experiment. The experiment occupied a ...
    • Estimation of sea surface wave spectra using acoustic tomography 

      Miller, James H. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1987-08)
      This thesis develops a new technique for estimating quasi-homogeneous and quasi-stationary sea surface wave frequency-direction spectra using acoustic tomography. The analysis of acoustic (mode and ray) phase and travel ...
    • Estuarine boundary layer mixing processes : insights from dye experiments 

      Chant, Robert J.; Geyer, W. Rockwell; Houghton, Robert; Hunter, Elias; Lerczak, James A. (American Meteorological Society, 2007-07)
      A series of dye releases in the Hudson River estuary elucidated diapycnal mixing rates and temporal variability over tidal and fortnightly time scales. Dye was injected in the bottom boundary layer for each of four releases ...
    • Estuarine exchange flow quantified with isohaline coordinates : contrasting long and short estuaries 

      Chen, Shih-Nan; Geyer, W. Rockwell; Ralston, David K.; Lerczak, James A. (American Meteorological Society, 2012-05)
      Isohaline coordinate analysis is used to compare the exchange flow in two contrasting estuaries, the long (with respect to tidal excursion) Hudson River and the short Merrimack River, using validated numerical models. The ...
    • Estuarine frontogenesis 

      Geyer, W. Rockwell; Ralston, David K. (American Meteorological Society, 2015-02)
      Model studies and observations in the Hudson River estuary indicate that frontogenesis occurs as a result of topographic forcing. Bottom fronts form just downstream of lateral constrictions, where the width of the estuary ...