Now showing items 915-934 of 5320

    • Contributions of long-term research and time-series observations to marine ecology and biogeochemistry 

      Ducklow, Hugh W.; Doney, Scott C.; Steinberg, Deborah K. (2008-05-02)
      Time-series observations form a critical element of oceanography. New interdisciplinary efforts launched in the past two decades complement the few earlier, longer-running time series in building a better, though still ...
    • Contributions to automated realtime underwater navigation 

      Stanway, Michael J. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2012-02)
      This dissertation presents three separate–but related–contributions to the art of underwater navigation. These methods may be used in postprocessing with a human in the loop, but the overarching goal is to enhance vehicle ...
    • A control system design technique for nonlinear discrete time systems 

      DeLonga, David M. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1989-02)
      A new control methodology is proposed for use with a class of nonlinear, single-input discrete time systems. The technique is based on a discrete time approach that parallels existing continuous time sliding surface ...
    • Controller design for underwater vehicle systems with communication constraints 

      Reed, Brooks L. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2015-02)
      Real-time cooperation between autonomous vehicles can enable time-critical missions such as tracking and pursuit of a dynamic target or environmental feature, but relies on wireless communications. Underwater communication ...
    • Controls of shear zone rheology and tectonic loading on postseismic creep 

      Montesi, Laurent G. J. (American Geophysical Union, 2004-10-08)
      Postseismic deformation is well documented in geodetic data collected in the aftermath of large earthquakes. In the postseismic time interval, GPS is most sensitive to creep in the lower crust or upper mantle activated by ...
    • Controls on dissolved cobalt in surface waters of the Sargasso Sea : comparisons with iron and aluminum 

      Shelley, R. U.; Sedwick, Peter N.; Bibby, Thomas S.; Cabedo-Sanz, P.; Church, Thomas M.; Johnson, Rodney J.; Macey, A. I.; Marsay, Christopher M.; Sholkovitz, Edward R.; Ussher, Simon J.; Worsfold, Paul J.; Lohan, M. C. (American Geophysical Union, 2012-05-19)
      Dissolved cobalt (dCo), iron (dFe) and aluminum (dAl) were determined in water column samples along a meridional transect (~31°N to 24°N) south of Bermuda in June 2008. A general north-to-south increase in surface ...
    • Controls on earthquake rupture and triggering mechanisms in subduction zones 

      Llenos, Andrea L. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2010-06)
      Large earthquake rupture and triggering mechanisms that drive seismicity in subduction zones are investigated in this thesis using a combination of earthquake observations, statistical and physical modeling. A comparison ...
    • Controls on melt migration and extraction at the ultraslow Southwest Indian Ridge 10°–16°E 

      Montesi, Laurent G. J.; Behn, Mark D.; Hebert, Laura B.; Lin, Jian; Barry, Jennifer L. (American Geophysical Union, 2011-10-04)
      Crustal thickness variations at the ultraslow spreading 10–16°E region of the Southwest Indian Ridge are used to constrain melt migration processes. In the study area, ridge morphology correlates with the obliquity of the ...
    • Controls on stable isotope and trace metal uptake in Neogloboquadrina pachyderma (sinistral) from an Antarctic sea-ice environment 

      Hendry, Katharine R.; Rickaby, Rosalind E. M.; Meredith, Michael P.; Elderfield, Henry (2008-11)
      The polar foraminifera Neogloboquadrina pachyderma (sinistral) dominates assemblages from the high latitude Southern Ocean, which is a key region for paleoclimate studies. Here, we use N. pachyderma (s.) harvested from ...
    • Controls on tectonic accretion versus erosion in subduction zones : implications for the origin and recycling of the continental crust 

      Clift, Peter D.; Vannucchi, Paola (American Geophysical Union, 2004-04-08)
      Documenting the mass flux through convergent plate margins is important to the understanding of petrogenesis in arc settings and to the origin of the continental crust, since subduction zones are the only major routes by ...
    • Convergence of calls as animals form social bonds, active compensation for noisy communication channels, and the evolution of vocal learning in mammals 

      Tyack, Peter L. (2007-09-12)
      The classic evidence for vocal production learning involves imitation of novel, often anthropogenic sounds. Among mammals, this has been reported for African elephants, harbor seals, and dolphins. A broader taxonomic ...
    • Convergent evolution of sodium ion selectivity in metazoan neuronal signaling 

      Barzilai, Maya Gur; Reitzel, Adam M.; Kraus, Johanna E. M.; Gordon, Dalia; Technau, Ulrich; Gurevitz, Michael; Moran, Yehu (Cell Press, 2012-08-30)
      Ion selectivity of metazoan voltage-gated Na+ channels is critical for neuronal signaling and has long been attributed to a ring of four conserved amino acids that constitute the ion selectivity filter (SF) at the channel ...
    • Cooling and internal waves on the Continental Shelf 

      Pringle, James M. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1998-06)
      The evolution of a coastal ocean undergoing uniform surface heat loss is examined. The dynamics of this ocean are initially modulated by the intense vertical mixing driven by surface cooling. The strong vertical mixing ...
    • Cooling the waters of the 17-meter flume at the Coastal Research Laboratory 

      Chapman, Robert J.; Galat, Richard E. (Woods Hole Oceanographic Institution, 1988-12)
      A cooling system has been developed to control the operating water temperature of the 17-Meter Flume at WHOI's Coastal Research Laboratory. The system utilizes a microprocessor-controlled refrigeration cycle to maintain ...
    • Cooperative localization for autonomous underwater vehicles 

      Bahr, Alexander (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2009-02)
      Self-localization of an underwater vehicle is particularly challenging due to the absence of Global Positioning System (GPS) reception or features at known positions that could otherwise have been used for position ...
    • Coordinated hydrological regimes in the Indo-Pacific region during the past two millennia 

      Tierney, Jessica E.; Oppo, Delia W.; Rosenthal, Yair; Russell, James M.; Linsley, Braddock K. (American Geophysical Union, 2010-03-05)
      Instrumental data suggest that major shifts in tropical Pacific atmospheric dynamics and hydrology have occurred within the past century, potentially in response to anthropogenic warming. To better understand these trends, ...
    • Copepods from warm-core ring 82-H 

      Copley, Nancy J.; Wiebe, Peter H.; Cowles, Timothy J. (Woods Hole Oceanographic Institution, 1989-07)
      Net tows were collected with a Multiple Opening/Closing Net Environmental Sampling System (MOCNESS) carrying twenty 1-m2 nets in October 1982 in and near warm-core ring 82-H in the North Atlantic (RV/Knorr cruise 98). ...
    • Coral calcification : insights from inorganic experiments and coral responses to environmental variables 

      Holcomb, Michael (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2010-02)
      Coral calcification is examined using a laboratory model and living corals. In the laboratory model, abiogenic aragonite formed at high saturation state (Ω>~20) had a granular appearance and was enriched in trace elements, ...
    • Coral macrobioerosion is accelerated by ocean acidification and nutrients 

      DeCarlo, Thomas M.; Cohen, Anne L.; Barkley, Hannah C.; Cobban, Quinn; Young, Charles; Shamberger, Kathryn E. F.; Brainard, Russell E.; Golbuu, Yimnang (2014-10)
      Coral reefs exist in a delicate balance between calcium carbonate (CaCO3) production and CaCO3 loss. Ocean acidification (OA), the CO2-driven decline in seawater pH and CaCO3 saturation state (Ω), threatens to tip this ...
    • Coral reef fish populations can persist without immigration 

      Salles, Océane C.; Maynard, Jeffrey A.; Joannides, Marc; Barbu, Corentin M.; Saenz-Agudelo, Pablo; Almany, Glenn R.; Berumen, Michael L.; Thorrold, Simon R.; Jones, Geoffrey P.; Planes, Serge (2015-10)
      Determining the conditions under which populations may persist requires accurate estimates of demographic parameters, including immigration, local reproductive success, and mortality rates. In marine populations, empirical ...