Now showing items 1-15 of 15

    • Analysis of Deep Seafloor Arrivals observed on NPAL04 

      Stephen, Ralph A.; Bolmer, S. Thompson; Udovydchenkov, Ilya A.; Dzieciuch, Matthew A.; Worcester, Peter F.; Andrew, Rex K.; Mercer, James A.; Colosi, John A.; Howe, Bruce M. (Woods Hole Oceanographic Institution, 2012-12)
      This report gives an overview of the analysis that was done on Deep Seafloor Arrivals since they were initially presented in Stephen et al (2009). All of the NPAL04/LOAPEX (North Pacific Acoustic Laboratory, 2004/ Long ...
    • Bottom interacting sound at 50 km range in a deep ocean environment 

      Udovydchenkov, Ilya A.; Stephen, Ralph A.; Duda, Timothy F.; Bolmer, S. Thompson; Worcester, Peter F.; Dzieciuch, Matthew A.; Mercer, James A.; Andrew, Rex K.; Howe, Bruce M. (Acoustical Society of America, 2012-10)
      Data collected during the 2004 Long-range Ocean Acoustic Propagation Experiment provide absolute intensities and travel times of acoustic pulses at ranges varying from 50 to 3200 km. In this paper a subset of these data ...
    • Deep seafloor arrivals in long range ocean acoustic propagation 

      Stephen, Ralph A.; Bolmer, S. Thompson; Udovydchenkov, Ilya A.; Worcester, Peter F.; Dzieciuch, Matthew A.; Andrew, Rex K.; Mercer, James A.; Colosi, John A.; Howe, Bruce M. (Acoustical Society of America, 2013-10)
      Ocean bottom seismometer observations at 5000 m depth during the long-range ocean acoustic propagation experiment in the North Pacific in 2004 show robust, coherent, late arrivals that are not readily explained by ocean ...
    • Eulerian and Lagrangian correspondence of high-frequency radar and surface drifter data : effects of radar resolution and flow components 

      Rypina, Irina I.; Kirincich, Anthony R.; Limeburner, Richard; Udovydchenkov, Ilya A. (American Meteorological Society, 2014-04)
      This study investigated the correspondence between the near-surface drifters from a mass drifter deployment near Martha’s Vineyard, Massachusetts, and the surface current observations from a network of three high-resolution, ...
    • Modal analysis of the range evolution of broadband wavefields in the North Pacific Ocean : low mode numbers 

      Udovydchenkov, Ilya A.; Brown, Michael G.; Duda, Timothy F.; Mercer, James A.; Andrew, Rex K.; Worcester, Peter F.; Dzieciuch, Matthew A.; Howe, Bruce M.; Colosi, John A. (Acoustical Society of America, 2012-06)
      The results of mode-processing measurements of broadband acoustic wavefields made in the fall of 2004 as part of the Long-Range Ocean Acoustic Propagation Experiment (LOAPEX) in the eastern North Pacific Ocean are reported ...
    • Mode filters and energy conservation 

      Udovydchenkov, Ilya A.; Rypina, Irina I.; Brown, Michael G. (Acoustical Society of America, 2010-04-07)
      The discrete form of the mode filtering problem is considered. The relevant equations constitute a linear inverse problem. Solutions to problems of this type are subject to a well-known trade-off between resolution 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 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 ...
    • NPAL04 OBS data analysis part 1 : kinematics of deep seafloor arrivals 

      Stephen, Ralph A.; Bolmer, S. Thompson; Udovydchenkov, Ilya A.; Worcester, Peter F.; Dzieciuch, Matthew A.; Van Uffelen, Lora J.; Mercer, James A.; Andrew, Rex K.; Buck, Linda J.; Colosi, John A.; Howe, Bruce M. (Woods Hole Oceanographic Institution, 2008-12)
      These notes provide supporting information for a JASA (Journal of the Acoustical Society of America) LttE (Letter to the Editor) manuscript, "Deep seafloor arrivals: A new class of arrivals in long-range ocean acoustic ...
    • Ocean Bottom Seismometer Augmentation in the North Pacific (OBSANP) - cruise report 

      Stephen, Ralph A.; Worcester, Peter F.; Udovydchenkov, Ilya A.; Aaron, Ernie; Bolmer, S. Thompson; Carey, Scott; McPeak, Sean P.; Swift, Stephen A.; Dzieciuch, Matthew A. (Woods Hole Oceanographic Institution, 2014-12)
      The Ocean Bottom Seismometer Augmentation in the North Pacific Experiment (OBSANP, June-July, 2013, R/V Melville) addresses the coherence and depth dependence of deep-water ambient noise and signals. During the 2004 NPAL ...
    • Piecewise coherent mode processing of acoustic data recorded on two horizontally separated vertical line arrays 

      Udovydchenkov, Ilya A.; Brown, Michael G.; Duda, Timothy F. (Acoustical Society of America, 2012-05-25)
      Motivated by measurements made in the 2004 Long-Range Ocean Acoustic Propagation Experiment (LOAPEX), the problem of mode processing transient acoustic signals collected on two nearby vertical line arrays is considered. ...
    • Three-dimensional numerical modeling of bottom-diffracted surface-reflected arrivals in the North Pacific [poster] 

      Stephen, Ralph A.; Udovydchenkov, Ilya A.; Bolmer, S. Thompson; Komatitsch, Dimitri; Tromp, Jeroen; Casarotti, Emanuele; Xie, Zhinan; Worcester, Peter F. (2015-12-15)
      Bottom-diffracted surface-reflected (BDSR) arrivals were first identified in the 2004 Long-range Ocean Acoustic Propagation Experiment (Stephen et al, 2013, JASA, v.134, p.3307-3317). The BDSR mechanism provides a means ...
    • Three-dimensional numerical modeling of sound propagation and scattering in the deep ocean with elastic bottoms [poster] 

      Udovydchenkov, Ilya A.; Stephen, Ralph A.; Komatitsch, Dimitri; Xie, Zhinan; Tromp, Jeroen (2014-02-25)
      A challenging problem in bottom-interacting ocean acoustics and marine seismology is to accurately describe environmental variability in a computationally feasible model. Wave field predictions are often difficult in ...
    • Weakly dispersive modal pulse propagation in the North Pacific Ocean 

      Udovydchenkov, Ilya A.; Brown, Michael G.; Duda, Timothy F.; Worcester, Peter F.; Dzieciuch, Matthew A.; Mercer, James A.; Andrew, Rex K.; Howe, Bruce M.; Colosi, John A. (Acoustical Society of America, 2013-10)
      The propagation of weakly dispersive modal pulses is investigated using data collected during the 2004 long-range ocean acoustic propagation experiment (LOAPEX). Weakly dispersive modal pulses are characterized by weak ...
    • Zonal jets as transport barriers in planetary atmospheres 

      Beron-Vera, F. J.; Brown, Michael G.; Olascoaga, M. J.; Rypina, Irina I.; Kocak, H.; Udovydchenkov, Ilya A. (American Meteorological Society, 2008-10)
      The connection between transport barriers and potential vorticity (PV) barriers in PV-conserving flows is investigated with a focus on zonal jets in planetary atmospheres. A perturbed PV staircase model is used to illustrate ...