Now showing items 1297-1316 of 5758

    • Direct measurement of riverine particulate organic carbon age structure 

      Rosenheim, Brad E.; Galy, Valier (American Geophysical Union, 2012-10-03)
      Carbon cycling studies focusing on transport and transformation of terrigenous carbon sources toward marine sedimentary sinks necessitate separation of particulate organic carbon (OC) derived from many different sources ...
    • Direct measurements of biogenic dimethylsulphide fluxes from the oceans : a synthesis 

      Zemmelink, Hendrik J.; Dacey, John W. H.; Hintsa, Eric J. (National Research Council Canada, 2004-06-24)
      This paper provides a brief overview of the state-of-the-art of techniques that are currently used for field measurements of trace gas fluxes and the subsequent derivation of gas transfer rates over the oceans. Special ...
    • Direct numerical simulations of instability and boundary layer turbulence under a solitary wave 

      Ozdemir, Celalettin E.; Hsu, Tian-Jian; Balachandar, S. (Cambridge University Press, 2013-08-28)
      A significant amount of research effort has been made to understand the boundary layer instability and the generation and evolution of turbulence subject to periodic/oscillatory flows. However, little is known about bottom ...
    • Direct observations of microscale turbulence and thermohaline structure in the Kuroshio Front 

      Nagai, Takeyoshi; Tandon, Amit; Yamazaki, Hidekatsu; Doubell, Mark J.; Gallager, Scott M. (American Geophysical Union, 2012-08-09)
      Direct observations of microstructure near the Kuroshio Front were conducted in August 2008 and October 2009. These show negative potential vorticity (PV) in the mixed layer south of the front, where directly measured ...
    • Direct-form adaptive equalization for underwater acoustic communication 

      Yellepeddi, Atulya (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2012-06)
      Adaptive equalization is an important aspect of communication systems in various environments. It is particularly important in underwater acoustic communication systems, as the channel has a long delay spread and is ...
    • Directional wavenumber characteristics of short sea waves 

      Suoja, Nicole M. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2000-02)
      Interest in short waves on the ocean surface has been growing over the last three decades because they play an important role in surface electromagnetic (e.m.) scattering. Currently radars and scatterometers which use ...
    • The discovery of new deep-sea hydrothermal vent communities in the Southern Ocean and implications for biogeography 

      Rogers, Alex D.; Tyler, Paul A.; Connelly, Douglas P.; Copley, Jonathan T.; James, Rachael H.; Larter, Robert D.; Linse, Katrin; Mills, Rachel A.; Naveira Garabato, Alberto C.; Pancost, Richard D.; Pearce, David A.; Polunin, Nicholas V. C.; German, Christopher R.; Shank, Timothy M.; Boersch-Supan, Philipp H.; Alker, Belinda J.; Aquilina, Alfred; Bennett, Sarah A.; Clarke, Andrew; Dinley, Robert J. J.; Graham, Alastair G. C.; Green, Darryl R. H.; Hawkes, Jeffrey A.; Hepburn, Laura; Hilario, Ana; Huvenne, Veerle A. I.; Marsh, Leigh; Ramirez-Llodra, Eva; Reid, William D. K.; Roterman, Christopher N.; Sweeting, Christopher J.; Thatje, Sven; Zwirglmaier, Katrin (Public Library of Science, 2012-01-03)
      Since the first discovery of deep-sea hydrothermal vents along the Galápagos Rift in 1977, numerous vent sites and endemic faunal assemblages have been found along mid-ocean ridges and back-arc basins at low to mid latitudes. ...
    • Discrete eddies in the northern North Atlantic as observed by looping RAFOS floats 

      Shoosmith, Deborah R.; Richardson, Philip L.; Bower, Amy S.; Rossby, H. Thomas (2004-10-29)
      RAFOS float trajectories near the 27.5 density level were analyzed to investigate discrete eddies in the northern North Atlantic with the objective of determining their geographical distribution and characteristics. ...
    • Discriminating between the nearfield and the farfield of acoustic transducers 

      Foote, Kenneth G. (Acoustical Society of America, 2014-10)
      Measurements of the performance of acoustic transducers, as well as ordinary measurements made with the same, may require discriminating between the farfield, where the field is spherically divergent, and the complementary ...
    • Discussion and illustration of problems suggested by the analysis of atmospheric cross-sections 

      Willett, Hurd C. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1935-07)
      The preparation of atmospheric cross-sections, in which the fields of the various meteorological elements are represented in the vertical plane containing a number of synoptic aerological soundings, has long been a part ...
    • Disentangling trophic interactions inside a Caribbean marine reserve 

      Kellner, Julie B.; Litvin, Steven Y.; Hastings, Alan; Micheli, Fiorenza; Mumby, Peter J. (Ecological Society of America, 2010-10)
      Recent empirical studies have demonstrated that human activities such as fishing can strongly affect the natural capital and services provided by tropical seascapes. However, policies to mitigate anthropogenic impacts can ...
    • Dismantling the deep earth : geochemical constraints from hotspot lavas for the origin and lengthscales of mantle heterogeneity 

      Jackson, Matthew G. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2008-02)
      Chapter 1 presents the first published measurements of Sr-isotope variability in olivine-hosted melt inclusions. Melt inclusions in just two Samoan basalt hand samples exhibit most of the total Sr-isotope variability ...
    • Dispersal and population connectivity in the deep North Atlantic estimated from physical transport processes 

      Etter, Ron J.; Bower, Amy S. (2015-06)
      Little is known about how larvae disperse in deep ocean currents despite how critical estimates of population connectivity are for ecology, evolution and conservation. Estimates of connectivity can provide important ...
    • Dispersal delays, predator–prey stability, and the paradox of enrichment 

      Klepac, Petra; Neubert, Michael G.; van den Driessche, P. (2007-03-26)
      It takes time for individuals to move from place to place. This travel time can be incorporated into metapopulation models via a delay in the interpatch migration term. Such a term has been shown to stabilize the positive ...
    • The dispersal of dense water formed in an idealized coastal polynya on a shallow sloping shelf 

      Zhang, Weifeng G.; Cenedese, Claudia (American Meteorological Society, 2014-06)
      This study examines the dispersal of dense water formed in an idealized coastal polynya on a sloping shelf in the absence of ambient circulation and stratification. Both numerical and laboratory experiments reveal two ...
    • Dispersion of a tracer in the deep Gulf of Mexico 

      Ledwell, James R.; He, Ruoying; Xue, Zuo; DiMarco, Steven; Spencer, Laura J.; Chapman, Piers (John Wiley & Sons, 2016-02-05)
      A 25 km streak of CF3SF5 was released on an isopycnal surface approximately 1100 m deep, and 150 m above the bottom, along the continental slope of the northern Gulf of Mexico, to study stirring and mixing of a passive ...
    • Dispersion of fine particles by wave-induced mass transport near a circular island 

      Womeldorf, Carole A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1993-08)
      We begin with the linearized irrotational theory describing the diffraction of an incoming plane wave by a vertical cylinder. From the free-surface motion, we describe the boundary-layer flow field U0i near that cylinder. ...
    • Dissolved Al in the zonal N Atlantic section of the US GEOTRACES 2010/2011 cruises and the importance of hydrothermal inputs 

      Measures, Christopher I.; Hatta, Mariko; Fitzsimmons, Jessica N.; Morton, Peter L. (2014-07)
      The distribution of dissolved aluminium determined during GA03, the US GEOTRACES North Atlantic Transects (US GT NAZT) shows large inputs to the basin from three main sources, atmospheric deposition, outflow from the ...
    • Dissolved and particulate trace metal micronutrients under the McMurdo Sound seasonal sea ice : basal sea ice communities as a capacitor for iron 

      Noble, Abigail E.; Moran, Dawn M.; Allen, Andrew E.; Saito, Mak A. (Frontiers Media, 2013-10-30)
      Dissolved and particulate metal concentrations are reported from three sites beneath and at the base of the McMurdo Sound seasonal sea ice in the Ross Sea of Antarctica. This dataset provided insight into Co and Mn ...
    • Dissolved inorganic and particulate iodine in the oceans 

      Wong, George T. F. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1976-02)
      Analytical methods have been developed for the determination of iodate, iodide and particulate iodine in sea water. Iodate is converted to tri-iodide and the absorbance of tri-iodide at 353 nm is measured. The precision ...