Now showing items 1-8 of 8

    • Analyzing state-dependent model–data comparison in multi-regime systems 

      Aretxabaleta, Alfredo L.; Smith, Keston W. (2011-01-07)
      An approach to analyze regime change in spatial time series data sets is followed and extended to jointly analyze a dynamical model depicting regime shift and observational data informing the same process. We analyze ...
    • Cold event in the South Atlantic Bight during summer of 2003 : model simulations and implications 

      Aretxabaleta, Alfredo L.; Blanton, Brian O.; Seim, Harvey E.; Werner, Francisco E.; Nelson, James R.; Chassignet, Eric P. (American Geophysical Union, 2007-05-11)
      A set of model simulations are used to determine the principal forcing mechanisms that resulted in anomalously cold water in the South Atlantic Bight (SAB) in the summer of 2003. Updated mass field and elevation boundary ...
    • Expectation-maximization analysis of spatial time series 

      Smith, Keston W.; Aretxabaleta, Alfredo L. (Copernicus Publications on behalf of the European Geosciences Union and the American Geophysical Union, 2007-02-01)
      Expectation maximization (EM) is used to estimate the parameters of a Gaussian Mixture Model for spatial time series data. The method is presented as an alternative and complement to Empirical Orthogonal Function (EOF) ...
    • Model initialization in a tidally energetic regime : a dynamically adjusted objective analysis 

      Aretxabaleta, Alfredo L.; Smith, Keston W.; McGillicuddy, Dennis J.; Ballabrera-Poy, Joaquim (2011-01-24)
      A simple improvement to objective analysis of hydrographic data is proposed to eliminate spatial aliasing e ects in tidally energetic regions. The proposed method consists of the evaluation of anomalies from observations ...
    • Model simulations of the Bay of Fundy Gyre : 1. Climatological results 

      Aretxabaleta, Alfredo L.; McGillicuddy, Dennis J.; Smith, Keston W.; Lynch, Daniel R. (American Geophysical Union, 2008-10-29)
      The characteristics of a persistent gyre in the mouth of the Bay of Fundy are studied using model simulations. A set of climatological runs are conducted to evaluate the relative importance of the different forcing mechanisms ...
    • Model simulations of the Bay of Fundy Gyre : 2. Hindcasts for 2005–2007 reveal interannual variability in retentiveness 

      Aretxabaleta, Alfredo L.; McGillicuddy, Dennis J.; Smith, Keston W.; Manning, James P.; Lynch, Daniel R. (American Geophysical Union, 2009-09-03)
      A persistent gyre at the mouth of the Bay of Fundy results from a combination of tidal rectification and buoyancy forcing. Here we assess recent interannual variability in the strength of the gyre using data assimilative ...
    • Near-bottom circulation and dispersion of sediment containing Alexandrium fundyense cysts in the Gulf of Maine during 2010–2011 

      Aretxabaleta, Alfredo L.; Butman, Bradford; Signell, Richard P.; Dalyander, P. Soupy; Sherwood, Christopher R.; Sheremet, Vitalii A.; McGillicuddy, Dennis J. (Elsevier, 2013-12-13)
      The life cycle of Alexandrium fundyense in the Gulf of Maine includes a dormant cyst stage that spends the winter predominantly in the bottom sediment. Wave-current bottom stress caused by storms and tides induces resuspension ...
    • Progress and challenges in coupled hydrodynamic-ecological estuarine modeling 

      Ganju, Neil K.; Brush, Mark J.; Rashleigh, Brenda; Aretxabaleta, Alfredo L.; del Barrio, Pilar; Grear, Jason S.; Harris, Lora A.; Lake, Samuel J.; McCardell, Grant; O’Donnell, James; Ralston, David K.; Signell, Richard P.; Testa, Jeremy M.; Vaudrey, Jamie M. P. (Springer, 2015-07-07)
      Numerical modeling has emerged over the last several decades as a widely accepted tool for investigations in environmental sciences. In estuarine research, hydrodynamic and ecological models have moved along parallel tracks ...