Now showing items 130-149 of 977

    • Calculation of 3-dimensional synthetic seismograms on the connection machine 

      Allen, Julie M.; Burns, D. R. (Woods Hole Oceanographic Institution, 1989-10)
      A three dimensional, second order finite difference method was used to create synthetic seismograms for elastic wave propagation in heterogeneous media. These synthetic seismograms are used to model rough seafloor, the ...
    • Calibration of broadband active acoustic systems using a single standard spherical target 

      Stanton, Timothy K.; Chu, Dezhang (Acoustical Society of America, 2008-07)
      When calibrating a broadband active acoustic system with a single standard target such as a sphere, the inherent resonances associated with the scattering by the sphere pose a significant challenge. In this paper, a method ...
    • Calibration sphere for low-frequency parametric sonars 

      Foote, Kenneth G.; Francis, David T. I.; Atkins, Philip R. (Acoustical Society of America, 2007-03)
      The problem of calibrating parametric sonar systems at low difference frequencies used in backscattering applications is addressed. A particular parametric sonar is considered: the Simrad TOPAS PS18 Parametric Sub-bottom ...
    • Calving localization at Helheim Glacier using multiple local seismic stations 

      Mei, M. Jeffrey; Holland, David M.; Anandakrishnan, Sridhar; Zheng, Tiantian (Copernicus Publications on behalf of the European Geosciences Union, 2017-02-22)
      A multiple-station technique for localizing glacier calving events is applied to Helheim Glacier in southeastern Greenland. The difference in seismic-wave arrival times between each pairing of four local seismometers is ...
    • Categorizing the severity of paralytic shellfish poisoning outbreaks in the Gulf of Maine for forecasting and management 

      Kleindinst, Judith L.; Anderson, Donald M.; McGillicuddy, Dennis J.; Stumpf, Richard P.; Fisher, Kathleen M.; Couture, Darcie A.; Hickey, J. Michael; Nash, Christopher (2013-03)
      Development of forecasting systems for harmful algal blooms (HABs) has been a long-standing research and management goal. Significant progress has been made in the Gulf of Maine, where seasonal bloom forecasts are now being ...
    • CFD study of hydrodynamic signal perception by fish using the lateral line system 

      Rapo, Mark A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2009-02)
      The lateral line system on fish has been found to aid in schooling behavior, courtship communication, active and passive hydrodynamic imaging, and prey detection. The most widely used artificial prey stimulus has been ...
    • Challenges associated with modeling low-oxygen waters in Chesapeake Bay : a multiple model comparison 

      Irby, Isaac D.; Friedrichs, Marjorie A. M.; Friedrichs, Carl T.; Bever, Aaron J.; Hood, Raleigh R.; Lanerolle, Lyon W. J.; Li, Ming; Linker, Lewis; Scully, Malcolm E.; Sellner, Kevin G.; Shen, Jian; Testa, Jeremy; Wang, Hao; Wang, Ping; Xia, Meng (Copernicus Publications on behalf of the European Geosciences Union, 2016-04-06)
      As three-dimensional (3-D) aquatic ecosystem models are used more frequently for operational water quality forecasts and ecological management decisions, it is important to understand the relative strengths and limitations ...
    • Changeable camouflage : how well can flounder resemble the colour and spatial scale of substrates in their natural habitats? 

      Akkaynak, Derya; Siemann, Liese A.; Barbosa, Alexandra; Mathger, Lydia M. (Royal Society, 2017-03-08)
      Flounder change colour and pattern for camouflage. We used a spectrometer to measure reflectance spectra and a digital camera to capture body patterns of two flounder species camouflaged on four natural backgrounds of ...
    • Changes in snow distribution and surface topography following a snowstorm on Antarctic sea ice 

      Trujillo, Ernesto; Leonard, Katherine; Maksym, Ted; Lehning, Michael (John Wiley & Sons, 2016-11-15)
      Snow distribution over sea ice is an important control on sea ice physical and biological processes. We combine measurements of the atmospheric boundary layer and blowing snow on an Antarctic sea ice floe with terrestrial ...
    • A channel subspace post-filtering approach to adaptive equalization 

      Nadakuditi, Rajesh Rao (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2002-02)
      One of the major problems in wireless communications is compensating for the time-varying intersymbol interference (ISI) due to multipath. Underwater acoustic communications is one such type of wireless communications ...
    • Characterization and modulation of Langmuir circulation in Chesapeake Bay 

      Scully, Malcolm E.; Fisher, Alexander W.; Suttles, Steven E.; Sanford, Lawrence P.; Boicourt, William C. (American Meteorological Society, 2015-10)
      Measurements made as part of a large-scale experiment to examine wind-driven circulation and mixing in Chesapeake Bay demonstrate that circulations consistent with Langmuir circulation play an important role in surface ...
    • Characterization of underwater target geometry from Autonomous Underwater Vehicle sampling of bistatic acoustic scattered fields 

      Fischell, Erin M. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2015-06)
      One of the long term goals of Autonomous Underwater Vehicle (AUV) minehunting is to have multiple inexpensive AUVs in a harbor autonomously classify hazards. Existing acoustic methods for target classification using ...
    • Characterizing the deep insular shelf coral reef habitat of the Hind Bank marine conservation district (US Virgin Islands) using the Seabed autonomous underwater vehicle 

      Armstrong, Roy A.; Singh, Hanumant; Torres, Juan; Nemeth, Richard S.; Can, Ali; Roman, Christopher N.; Eustice, Ryan M.; Riggs, Lauren; Garcia-Moliner, Graciela (2005-10-26)
      The benthic communities of the deep insular shelf at the Hind Bank Marine Conservation District (MCD), an important spawning grouper aggregation site, were studied with the Seabed autonomous underwater vehicle (AUV) at ...
    • Chemical data quantify Deepwater Horizon hydrocarbon flow rate and environmental distribution 

      Ryerson, Thomas B.; Camilli, Richard; Kessler, John D.; Kujawinski, Elizabeth B.; Reddy, Christopher M.; Valentine, David L.; Atlas, Elliot; Blake, Donald R.; de Gouw, Joost; Meinardi, Simone; Parrish, David D.; Peischl, Jeff; Seewald, Jeffrey S.; Warneke, Carsten (2011-11-11)
      Detailed airborne, surface, and subsurface chemical measurements, primarily obtained in May and June 2010, are used to quantify initial hydrocarbon compositions along different transport pathways – in deep subsurface plumes, ...
    • Circulation and intrusions northeast of Taiwan : chasing and predicting uncertainty in the cold dome 

      Gawarkiewicz, Glen G.; Jan, Sen; Lermusiaux, Pierre F.J.; McClean, Julie L.; Centurioni, Luca R.; Taylor, Kevin; Cornuelle, Bruce D.; Duda, Timothy F.; Wang, Joe; Yang, Yiing-Jang; Sanford, Thomas B.; Lien, Ren-Chieh; Lee, Craig M.; Lee, Ming-An; Leslie, Wayne; Haley, Patrick J.; Niiler, Pearn P.; Gopalakrishnan, Ganesh; Velez-Belchi, Pedro; Lee, Dong-Kyu; Kim, Yoo Yin (The Oceanography Society, 2011-12)
      An important element of present oceanographic research is the assessment and quantification of uncertainty. These studies are challenging in the coastal ocean due to the wide variety of physical processes occurring on a ...
    • Classification of broadband echoes from prey of a foraging Blainville's beaked whale 

      Jones, Benjamin A.; Stanton, Timothy K.; Lavery, Andone C.; Johnson, Mark P.; Madsen, Peter T.; Tyack, Peter L. (Acoustical Society of America, 2008-03)
      Blainville's beaked whales (Mesoplodon densirostris) use broadband, ultrasonic echolocation signals with a −10 dB bandwidth from 26 to 51 kHz to search for, localize, and approach prey that generally consist of mid-water ...
    • Clicking for calamari : toothed whales can echolocate squid Loligo pealeii 

      Madsen, Peter T.; Wilson, M.; Johnson, Mark P.; Hanlon, Roger T.; Bocconcelli, Alessandro; Aguilar De Soto, Natacha; Tyack, Peter L. (Inter-Research, 2007-11-27)
      Squid play an important role in biomass turnover in marine ecosystems and constitute a food source for ~90% of all echolocating toothed whale species. Nonetheless, it has been hypothesized that the soft bodies of squid ...
    • Climate change, precipitation and impacts on an estuarine refuge from disease 

      Levinton, Jeffrey; Doall, Michael; Ralston, David K.; Starke, Adam; Allam, Bassem (Public Library of Science, 2011-04-28)
      Oysters play important roles in estuarine ecosystems but have suffered recently due to overfishing, pollution, and habitat loss. A tradeoff between growth rate and disease prevalence as a function of salinity makes the ...
    • Climatological mean circulation at the New England shelf break 

      Zhang, Weifeng G.; Gawarkiewicz, Glen G.; McGillicuddy, Dennis J. (American Meteorological Society, 2011-10)
      A two-dimensional cross-shelf model of the New England continental shelf and slope is used to investigate the mean cross-shelf and vertical circulation at the shelf break and their seasonal variation. The model temperature ...
    • A climatology of the Middle Atlantic Bight shelfbreak front 

      Linder, Christopher A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1996-09)
      Description of the shelfbreak front in the Middle Atlantic Bight is hampered by the extreme variability of the front. In order to gain more insight into the mean frontal structure and associated baroclinic jet, historical ...