Now showing items 537-556 of 980

    • Microbial iron uptake as a mechanism for dispersing iron from deep-sea hydrothermal vents 

      Li, Meng; Toner, Brandy M.; Baker, Brett J.; Breier, John A.; Sheik, Cody S.; Dick, Gregory J. (2014-01)
      Deep-sea hydrothermal vents are a significant source of oceanic iron. Although hydrothermal iron rapidly precipitates as inorganic minerals upon mixing with seawater, it can be stabilized by organic matter and dispersed ...
    • Microbial size spectra from diverse marine ecosystems 

      Gin, Karina Y. H. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1996-06)
      Characteristics of microbial size spectra (bacteria and phytoplankton) were examined in relation to changes in ecosystem productivity and environmental perturbations. Samples were obtained from productive coastal waters ...
    • Microearthquake evidence for reaction-driven cracking within the Trans-Atlantic Geotraverse active hydrothermal deposit 

      Pontbriand, Claire W.; Sohn, Robert A. (John Wiley & Sons, 2014-03-19)
      We detected 32,078 very small, local microearthquakes (average ML = −1) during a 9 month deployment of five ocean bottom seismometers on the periphery of the Trans-Atlantic Geotraverse active mound. Seismicity rates were ...
    • Microscale, finescale, and mesoscale measurements made during the 2004 Structured Mixing Project (Micro-Tow 04) Cruise 

      Duda, Timothy F.; Sellers, Cynthia J. (Woods Hole Oceanographic Institution, 2016-04)
      A physical oceanographic sampling voyage was made with RV Endeavor during August 2004 to evaluate diapycnal mixing processes on the continental shelf south of Massachusetts and Rhode Island, USA. The goal of the project ...
    • Microwave radar cross sections and Doppler velocities measured in the surf zone 

      Farquharson, Gordon; Frasier, Stephen J.; Raubenheimer, Britt; Elgar, Steve (American Geophysical Union, 2005-12-23)
      The relationship between microwave imaging radar measurements of fluid velocities in the surf zone and shoaling, breaking, and broken waves is studied with field observations. Normalized radar cross section (NRCS) and ...
    • Mid-ocean ridge exploration with an autonomous underwater vehicle 

      Yoerger, Dana R.; Bradley, Albert M.; Jakuba, Michael V.; Tivey, Maurice A.; German, Christopher R.; Shank, Timothy M.; Embley, Robert W. (Oceanography Society, 2007-12)
      Human-occupied submersibles, towed vehicles, and tethered remotely operated vehicles (ROVs) have traditionally been used to study the deep seafloor. In recent years, however, autonomous underwater vehicles (AUVs) have ...
    • Mid-water current aided localization for autonomous underwater vehicles 

      Medagoda, Lashika; Williams, Stefan B.; Pizarro, Oscar; Kinsey, James C.; Jakuba, Michael V. (2015-12)
      Survey-class Autonomous Underwater Vehi- cles (AUVs) typically rely on Doppler Velocity Logs (DVL) for precision localization near the seafloor. In cases where the seafloor depth is greater than the DVL bottom-lock ...
    • Mine burial experiments at the Martha’s Vineyard Coastal Observatory 

      Traykovski, Peter A.; Richardson, Michael D.; Mayer, Larry A.; Irish, James D. (IEEE, 2007-01)
      Several experiments to measure postimpact burial of seafloor mines by scour and fill have been conducted near the Woods Hole Oceanographic Institution's Martha's Vineyard Coastal Observatory (MVCO, Edgartown, MA). The ...
    • Mineral phase analysis of deep-sea hydrothermal particulates by a Raman spectroscopy expert algorithm : toward autonomous in situ experimentation and exploration 

      Breier, John A.; German, Christopher R.; White, Sheri N. (American Geophysical Union, 2009-05-14)
      This paper demonstrates that a Raman spectroscopy, point-counting technique can be used for phase analysis of minerals commonly found in deep-sea hydrothermal plumes, even for minerals with similar chemical compositions. ...
    • A miniature deep sea temperature data recorder : design, construction, and use 

      Koehler, Richard L.; von Herzen, Richard P. (Woods Hole Oceanographic Institution, 1986-01)
      A miniature temperature recorder has been developed to be used with the hydraulic piston sediment corer <HPC) on the Deep Sea Drilling Project <DSDP). The instrumentation fits into pressure-sealed slots in the wall of the ...
    • A miniature urethane molded acoustic transducer 

      Dunn, Christopher V. R. (Woods Hole Oceanographic Institution, 1984-08)
      The development of a reliable miniature molded transducer for the Williams/Koehler acoustic current meter, BASS (Benthic Acoustic Stress Sensor) ls documented. The procedures developed and components selected for ...
    • Mixing by shear instability at high Reynolds number 

      Geyer, W. Rockwell; Lavery, Andone C.; Scully, Malcolm E.; Trowbridge, John H. (American Geophysical Union, 2010-11-25)
      Shear instability is the dominant mechanism for converting fluid motion to mixing in the stratified ocean and atmosphere. The transition to turbulence has been well characterized in laboratory settings and numerical ...
    • Mixing in a coastal environment : 1. A view from dye dispersion 

      Ledwell, James R.; Duda, Timothy F.; Sundermeyer, Miles A.; Seim, Harvey E. (American Geophysical Union, 2004-10-26)
      Dye release experiments were performed together with microstructure profiling to compare the two methods of estimating diapycnal diffusivity during summer and fall stratification on the continental shelf south of New ...
    • Mixing of dissolved oxygen in Chesapeake Bay driven by the interaction between wind-driven circulation and estuarine bathymetry 

      Scully, Malcolm E. (John Wiley & Sons, 2016-08-08)
      Field observations collected in Chesapeake Bay demonstrate how wind-driven circulation interacts with estuarine bathymetry to control when and where the vertical mixing of dissolved oxygen occurs. In the across-Bay direction, ...
    • Mixing processes and hydraulic control in a highly stratified estuary 

      MacDonald, Daniel G. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2003-02)
      This thesis utilizes field data from the Fraser River Estuary, a highly stratified system located in southwestern British Columbia, Canada, to investigate the nature of mixing processes in a highly stratified environment, ...
    • 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 ...
    • Modal analysis of vertical array receptions for the Heard Island Feasibility Test 

      Sperry, Brian J. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1994-05)
      During the 1991 Heard Island Feasibility Test, a vertical hydrophone array deployed off Monterey, CA, recorded transmissions from a low-frequency acoustic source nearly 18,000 km away. By determining the modal structure ...
    • Modal processing for acoustic communications in shallow water experiment 

      Morozov, Andrey K.; Preisig, James C.; Papp, Joseph C. (Acoustical Society of America, 2008-09)
      Acoustical array data from the Shallow Water Acoustics experiment was processed to show the feasibility of broadband mode decomposition as a preprocessing method to reduce the effective channel delay spread and concentrate ...
    • A modal/WKB inversion method for determining sound speed profiles in the ocean and ocean bottom 

      Casey, Kevin D. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1988-06)
      Two approaches to determining the ocean sound speed profile using measured acoustic modal eigenvalues are examined. Both methods use measured eigenvalues and mode dependent assumed values of the WKB phase integral as ...
    • 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 ...