Now showing items 3510-3529 of 8520

    • Hydrographic station data of five surveys of the beta-triangle in the eastern North Atlantic, 1978-1981 

      Behringer, David W.; Knapp, George P.; Stanley, Robert J.; Stommel, Henry M. (Woods Hole Oceanographic Institution, 1983-07)
      This is a data report, giving temperature, salinity and dissolved oxygen data obtained during five surveys of the beta-triangle area of the eastern North Atlantic in the years 1979-81. The report is divided into two ...
    • Hydrographic structure of overflow water passing through the Denmark Strait 

      Mastropole, Dana M. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2015-09)
      Denmark Strait Overflow Water (DSOW) constitutes the densest portion of North Atlantic Deep Water, which feeds the lower limb of the Atlantic Meridional Overturning Circulation (AMOC). As such, it is critical to understand ...
    • Hydrographic study of Buzzards Bay, 1982-1983 

      Rosenfeld, Leslie K.; Signell, Richard P.; Gawarkiewicz, Glen G. (Woods Hole Oceanographic Institution, 1984-02)
      A series of four hydrographic cruises at three-month intervals was undertaken in Buzzards Bay in 1982-83. Buzzards Bay is located on the southern coast of Massachusetts, west of Cape Cod. Listings and vertical profiles ...
    • Hydrography and circulation near the crest of the East Pacific Rise between 9° and 10°N 

      Thurnherr, Andreas M.; Ledwell, James R.; Lavelle, J. William; Mullineaux, Lauren S. (2010-12-12)
      Topography has a strong effect on the physical oceanography over the flanks and crests of the global mid-ocean ridge system. Here, we present an analysis of the hydrography and circulation near the crest of the East ...
    • Hydrologic control of carbon cycling and aged carbon discharge in the Congo River basin 

      Schefuß, Enno; Eglinton, Timothy I.; Spencer-Jones, Charlotte L.; Rullkötter, Jürgen; De Pol-Holz, Ricardo; Talbot, Helen M.; Grootes, Pieter; Schneider, Ralph R. (2016-07)
      The age of organic material discharged by rivers provides information about its sources and carbon cycling processes within watersheds. While elevated ages in fluvially-transported organic matter are usually explained ...
    • Hydrological and biogeochemical cycling along the Greenland ice sheet margin 

      Bhatia, Maya P. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2012-02)
      Global warming has led to a significant increase in Greenland ice sheet (GrIS) melt and runoff since 1990, resulting in escalated export of fresh water and associated sediment to the surrounding North Atlantic and Arctic ...
    • Hydrological variations of the intermediate water masses of the western Mediterranean Sea during the past 20 ka inferred from neodymium isotopic composition in foraminifera and cold-water corals 

      Dubois-Dauphin, Quentin; Montagna, Paolo; Siani, Giuseppe; Douville, Eric; Wienberg, Claudia; Hebbeln, Dierk; Liu, Zhifei; Kallel, Nejib; Dapoigny, Arnaud; Revel, Marie; Pons-Branchu, Edwige; Taviani, Marco; Colin, Christophe (Copernicus Publications on behalf of the European Geosciences Union, 2017-01-10)
      We present the neodymium isotopic composition (εNd) of mixed planktonic foraminifera species from a sediment core collected at 622 m water depth in the Balearic Sea, as well as εNd of scleractinian cold-water corals (CWC; ...
    • Hydrology in the Sea of Marmara during the last 23 ka : implications for timing of Black Sea connections and sapropel deposition 

      Vidal, L.; Menot, G.; Joly, C.; Bruneton, H.; Rostek, F.; Cagatay, M. Namik; Major, Candace O.; Bard, Edouard (American Geophysical Union, 2010-02-06)
      Sediments deposited under lacustrine and marine conditions in the Sea of Marmara hold a Late Quaternary record for water exchange between the Black Sea and the Mediterranean Sea. Here we report a multiproxy data set based ...
    • Hydrothermal activity along the slow-spreading Lucky Strike ridge segment (Mid-Atlantic Ridge) : distribution, heatflux, and geological controls 

      Escartin, Javier E.; Barreyre, Thibaut; Cannat, Mathilde; Garcia, Rafael; Gracias, Nuno; Deschamps, Anne; Salocchi, Aura; Sarradin, Pierre-Marie; Ballu, Valerie (2015-09)
      We have reviewed available visual information from the seafloor, and recently acquired microbathymetry for several traverses across the Lucky Strike segment, to evaluate the distribution of hydrothermal activity. We have ...
    • Hydrothermal activity on the ultra-slow spreading southern Knipovich Ridge 

      Connelly, Douglas P.; German, Christopher R.; Asada, Miho; Okino, K.; Egorov, A.; Naganuma, T.; Pimenov, N.; Cherkashev, G.; Tamaki, K. (American Geophysical Union, 2007-08-28)
      We report first evidence for hydrothermal activity from the southern Knipovich Ridge, an ultra-slow spreading ridge segment in the Norwegian-Greenland Sea. Evidence comes from optical backscatter anomalies collected during ...
    • The hydrothermal alteration of oceanic basalts by seawater 

      Humphris, Susan E. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1976-10)
      Considerable geological and geophysical evidence now exists to support the hypothesis that seawater circulates through freshly intruded basalt at the mid-ocean ridges. As a consequence of this process, reactions between ...
    • Hydrothermal circulation within the Endeavour Segment, Juan de Fuca Ridge 

      Johnson, H. Paul; Tivey, Maurice A.; Bjorklund, Tor A.; Salmi, Marie S. (American Geophysical Union, 2010-05-06)
      Areas of the seafloor at mid-ocean ridges where hydrothermal vents discharge are easily recognized by the dramatic biological, physical, and chemical processes that characterize such sites. Locations where seawater flows ...
    • Hydrothermal discharge during submarine eruptions : the importance of detection, response, and new technology 

      Baker, Edward T.; Chadwick, William W.; Cowen, James P.; Dziak, Robert P.; Rubin, Kenneth H.; Fornari, Daniel J. (The Oceanography Society, 2012-03)
      Submarine volcanic eruptions and intrusions construct new oceanic crust and build long chains of volcanic islands and vast submarine plateaus. Magmatic events are a primary agent for the transfer of heat, chemicals, and ...
    • Hydrothermal exploration of mid-ocean ridges : where might the largest sulfide deposits be forming? 

      German, Christopher R.; Petersen, Sven; Hannington, Mark D. (2015-11)
      Here, we review the relationship between the distribution of modern-day seafloor hydrothermal activity along the global mid-ocean ridge crest and the nature of the mineral deposits being formed at those sites. Since the ...
    • Hydrothermal exploration of the Fonualei Rift and Spreading Center and the Northeast Lau Spreading Center 

      German, Christopher R.; Resing, Joseph A.; Prien, R. D.; Walker, Sharon L.; Edmonds, Henrietta N.; Langmuir, Charles H. (American Geophysical Union, 2006-11-29)
      We report evidence for active hydrothermal venting along two back-arc spreading centers of the NE Lau Basin: the Fonualei Rift and Spreading Center (FRSC) and the Northeast Lau Spreading Center (NELSC). The ridge segments ...
    • Hydrothermal impacts on trace element and isotope ocean biogeochemistry 

      German, Christopher R.; Casciotti, Karen L.; Dutay, Jean-Claude; Heimburger, Lars-Eric; Jenkins, William J.; Measures, Christopher I.; Mills, Rachel A.; Obata, Hajime; Schlitzer, Reiner; Tagliabue, Alessandro; Turner, David R.; Whitby, Hannah (The Royal Society, 2016-10-17)
      Hydrothermal activity occurs in all ocean basins, releasing high concentrations of key trace elements and isotopes (TEIs) into the oceans. Importantly, the calculated rate of entrainment of the entire ocean volume through ...
    • Hydrothermal plume dynamics on Europa : implications for chaos formation 

      Goodman, Jason C.; Collins, Geoffrey C.; Marshall, John C.; Pierrehumbert, Raymond T. (American Geophysical Union, 2004-03-20)
      Hydrothermal plumes may be responsible for transmitting radiogenic or tidally generated heat from Europa's rocky interior through a liquid ocean to the base of its ice shell. This process has been implicated in the formation ...
    • Hydrothermal sediments as a potential record of seawater Nd isotope compositions : the Rainbow vent site (36°14′N, Mid-Atlantic Ridge) 

      Chavagnac, Valerie; Palmer, Martin R.; Milton, J. Andrew; Green, Darryl R. H.; German, Christopher R. (American Geophysical Union, 2006-09-09)
      Geochemical compositions and Sr and Nd isotopes were measured in two cores collected ~2 and 5 km from the Rainbow hydrothermal vent site on the Mid-Atlantic Ridge. Overall, the cores record enrichments in Fe and other ...
    • Hydrothermal vent fields and chemosynthetic biota on the world's deepest seafloor spreading centre 

      Connelly, Douglas P.; Copley, Jonathan T.; Murton, Bramley J.; Stansfield, Kate; Tyler, Paul A.; German, Christopher R.; Van Dover, Cindy L.; Amon, Diva; Furlong, Maaten; Grindlay, Nancy; Hayman, Nicholas W.; Huhnerbach, Veit; Judge, Maria; Le Bas, Tim; McPhail, Stephen; Meier, Alexandra; Nakamura, Ko-ichi; Nye, Verity; Pebody, Miles; Pedersen, Rolf B.; Plouviez, Sophie; Sands, Carla M.; Searle, Roger C.; Stevenson, Peter; Taws, Sarah; Wilcox, Sally (Nature Publishing Group, 2012-01-10)
      The Mid-Cayman spreading centre is an ultraslow-spreading ridge in the Caribbean Sea. Its extreme depth and geographic isolation from other mid-ocean ridges offer insights into the effects of pressure on hydrothermal ...
    • Hydrothermal vent mussel habitat chemistry, pre- and post-eruption at 9°50′North on the East Pacific Rise 

      Nees, Heather A.; Moore, Tommy S.; Mullaugh, Katherine M.; Holyoke, Rebecca R.; Janzen, Christopher P.; Ma, Shufen; Metzger, Edouard; Waite, Tim J.; Yucel, Mustafa; Lutz, Richard A.; Shank, Timothy M.; Vetriani, Costantino; Nuzzio, Donald B.; Luther, George W. (National Shellfisheries Association, 2008-03)
      Between October 2005 and March 2006, a seafloor volcanic eruption occurred at 9°50′N East Pacific Rise (EPR), establishing a “time zero” for characterizing newly-formed hydrothermal vent habitats and comparing them to ...