Now showing items 647-666 of 1068

    • Nature of the Jurassic Magnetic Quiet Zone 

      Tominaga, Masako; Tivey, Maurice A.; Sager, William W. (John Wiley & Sons, 2015-10-24)
      The nature of the Jurassic Quiet Zone (JQZ), a region of low-amplitude oceanic magnetic anomalies, has been a long-standing debate with implications for the history and behavior of the Earth's geomagnetic field and plate ...
    • Navigational infrastructure at the East Pacific Rise 9°50′N area following the 2005–2006 eruption : seafloor benchmarks and near-bottom multibeam surveys 

      Soule, Samuel A.; Ferrini, Vicki L.; Kinsey, James C.; Fornari, Daniel J.; Sellers, Cynthia J.; White, Scott M.; Von Damm, Karen L.; Carbotte, Suzanne M. (American Geophysical Union, 2008-11-06)
      Four seafloor benchmarks were deployed with ROV Jason2 at frequently visited areas along the northern East Pacific Rise (NEPR) ridge crest near 9°50′N, within the Ridge2000 EPR integrated study site (ISS) bull's eye. When ...
    • Near collapse of the meridional SST gradient in the eastern equatorial Pacific during Heinrich Stadial 1 

      Kienast, Stephanie S.; Friedrich, Tobias; Dubois, Nathalie; Hill, Paul S.; Timmermann, Axel; Mix, Alan C.; Kienast, Markus (John Wiley & Sons, 2013-11-25)
      Sea surface temperatures (SST) and inorganic continental input over the last 25,000 years (25 ka) are reconstructed in the far eastern equatorial Pacific (EEP) based on three cores stretching from the equatorial front ...
    • The Neogene and Quaternary : chronostratigraphic compromise or non-overlapping magisteria? 

      Aubry, Marie-Pierre; Berggren, William A.; Van Couvering, John; McGowran, Brian; Hilgen, Frits; Steininger, Fritz; Lourens, Lucas (Micropaleontology Press, 2009-03)
      The International Commission on Stratigraphy (ICS) together with its subcommissions on Neogene Stratigraphy (SNS) and Quaternary Stratigraphy (SQS) are facing a persistent conundrum regarding the status of the Quaternary, ...
    • Network strain filter : a new tool for monitoring and detecting transient deformation signals in GPS arrays 

      Ohtani, Ryu; McGuire, Jeffrey J.; Segall, Paul (American Geophysical Union, 2010-12-22)
      We have developed a tool to detect transient deformation signals from large-scale (principally GPS) geodetic arrays, referred to as a Network Strain Filter (NSF). The strategy is to extract spatially and temporally coherent ...
    • A new Late Pliocene large provannid gastropod associated with hydrothermal venting at Kane Megamullion, Mid-Atlantic Ridge 

      Kaim, Andrzej; Tucholke, Brian E.; Waren, Anders (2011-03)
      A new gastropod, Kaneconcha knorri gen et sp. nov., was found in marlstone dredged from the surface of Adam Dome at Kane Megamullion on the flank of the Mid-Atlantic Ridge in an area of former hydrothermal activity. The ...
    • A new method for the determination of low-level actinium-227 in geological samples 

      Dulaiova, Henrieta; Sims, Kenneth W. W.; Charette, Matthew A.; Prytulak, Julie; Blusztajn, Jerzy S. (2012-07-31)
      We developed a new method for the determination of 227Ac in geological samples. The method uses extraction chromatographic techniques and alpha-spectrometry and is applicable for a range of natural matrices. Here we report ...
    • A new model for analyzing the effect of fractures on triaxial deformation 

      Zhu, Wenlu; Walsh, Joseph B. (2006-03-20)
      Rock is porous, with a connected network of cracks and pores. The static and dynamic behaviors of a rock sample under load depend on both the solid mineral matrix and the porous phase. In general, the configuration of the ...
    • Newtonian versus non-Newtonian upper mantle viscosity : implications for subduction initiation 

      Billen, Magali I.; Hirth, Greg (American Geophysical Union, 2005-10-08)
      The effect of rheology on the evolution of the slab-tip during subduction initiation is analyzed using 2-D numerical flow models. Experimentally determined flow laws have both strong temperature- and stress-dependence, ...
    • Noble gas signatures in Greenland : tracing glacial meltwater sources 

      Niu, Yi; Castro, M. Clara; Aciego, Sarah M.; Hall, Chris M.; Stevenson, Emily I.; Arendt, Carli A.; Das, Sarah B. (John Wiley & Sons, 2015-11-06)
      This study represents the first comprehensive noble gas study in glacial meltwater from the Greenland Ice Sheet. It shows that most samples are in disequilibrium with surface collection conditions. A preliminary Ne and Xe ...
    • Noble gas signatures of abyssal gabbros and peridotites at an Indian Ocean core complex 

      Kumagai, Hidenori; Dick, Henry J. B.; Kaneoka, Ichiro (American Geophysical Union, 2003-12-30)
      We report some of the first noble gas data for in situ lower oceanic crust and shallow mantle. From a suite of gabbros and peridotites recovered from the Atlantis Bank oceanic core complex on the Southwest Indian Ridge, ...
    • Nonhomogeneous seawater Sr isotopic composition in the coastal oceans : a novel tool for tracing water masses and submarine groundwater discharge 

      Huang, Kuo-Fang; You, Chen-Feng; Chung, Chuan-Hsiung; Lin, In-Tian (American Geophysical Union, 2011-05-07)
      Here we present high-precision (2σ = ±3 ppm) 87Sr/86Sr measurements in coastal waters, together with salinity, to evaluate water mass mixing and the influence of submarine groundwater discharge (SGD) in coastal waters and ...
    • Nonvolcanic seafloor spreading and corner-flow rotation accommodated by extensional faulting at 15°N on the Mid-Atlantic Ridge : a structural synthesis of ODP Leg 209 

      Schroeder, Timothy; Cheadle, Michael J.; Dick, Henry J. B.; Faul, Ulrich; Casey, John F.; Kelemen, Peter B. (American Geophysical Union, 2007-06-28)
      Drilling during ODP Leg 209, dredging, and submersible dives have delineated an anomalous stretch of the Mid-Atlantic Ridge north and south of the 15°20′N Fracture Zone. The seafloor here consists dominantly of mantle ...
    • Nonvolcanic tectonic islands in ancient and modern oceans 

      Palmiotto, Camilla; Corda, Laura; Ligi, Marco; Cipriani, Anna; Dick, Henry J. B.; Douville, Eric; Gasperini, Luca; Montagna, Paolo; Thil, Francois; Borsetti, Anna Maria; Balestra, Barbara; Bonatti, Enrico (John Wiley & Sons, 2013-10-24)
      Most oceanic islands are due to excess volcanism caused by thermal and/or compositional mantle melting anomalies. We call attention here to another class of oceanic islands, due not to volcanism but to vertical motions of ...
    • North American climate in CMIP5 experiments. Part II: evaluation of historical simulations of intraseasonal to decadal variability 

      Sheffield, Justin; Camargo, Suzana J.; Fu, Rong; Hu, Qi; Jiang, Xianan; Johnson, Nathaniel; Karnauskas, Kristopher B.; Kim, Seon Tae; Kinter, Jim; Kumar, Sanjiv; Langenbrunner, Baird; Maloney, Eric; Mariotti, Annarita; Meyerson, Joyce E.; Neelin, J. David; Nigam, Sumant; Pan, Zaitao; Ruiz-Barradas, Alfredo; Seager, Richard; Serra, Yolande L.; Sun, De-Zheng; Wang, Chunzai; Xie, Shang-Ping; Yu, Jin-Yi; Zhang, Tao; Zhao, Ming (American Meteorological Society, 2013-12-01)
      This is the second part of a three-part paper on North American climate in phase 5 of the Coupled Model Intercomparison Project (CMIP5) that evaluates the twentieth-century simulations of intraseasonal to multidecadal ...
    • North Atlantic forcing of tropical Indian Ocean climate 

      Mohtadi, Mahyar; Prange, Matthias; Oppo, Delia W.; De Pol-Holz, Ricardo; Merkel, Ute; Zhang, Xiao; Steinke, Stephan; Luckge, Andreas (2014-02)
      The response of the tropical climate in the Indian Ocean realm to abrupt climate change events in the North Atlantic Ocean is contentious. Repositioning of the intertropical convergence zone is thought to have been responsible ...
    • The North Pacific Acoustic Laboratory deep-water acoustic propagation experiments in the Philippine Sea 

      Worcester, Peter F.; Dzieciuch, Matthew A.; Mercer, James A.; Andrew, Rex K.; Dushaw, Brian D.; Baggeroer, Arthur B.; Heaney, Kevin D.; D'Spain, Gerald L.; Colosi, John A.; Stephen, Ralph A.; Kemp, John N.; Howe, Bruce M.; Van Uffelen, Lora J.; Wage, Kathleen E. (Acoustical Society of America, 2013-10)
      A series of experiments conducted in the Philippine Sea during 2009–2011 investigated deep-water acoustic propagation and ambient noise in this oceanographically and geologically complex region: (i) the 2009 North Pacific ...
    • Notes for Geoacoustic_TDFD 

      Stephen, Ralph A.; Bolmer, S. Thompson (Woods Hole Oceanographic Institution, 2006-02)
      These notes were written to help users run the WHOI TDFD (Time Domain Finite Difference) elastic wave equation code that was prepared for distribution through the ONR Ocean Acoustics Library (http://www.hlsresearch.com/oalib/). ...
    • A novel salinity proxy based on Na incorporation into foraminiferal calcite 

      Wit, Johannes C.; de Nooijer, L. J.; Wolthers, M.; Reichart, Gert-Jan (Copernicus Publications on behalf of the European Geosciences Union, 2013-10-09)
      Salinity and temperature determine seawater density, and differences in both thereby control global thermohaline circulation. Whereas numerous proxies have been calibrated and applied to reconstruct temperature, a direct ...
    • NPAL04 OBS data analysis part 1 : kinematics of deep seafloor arrivals 

      Stephen, Ralph A.; Bolmer, S. Thompson; Udovydchenkov, Ilya A.; Worcester, Peter F.; Dzieciuch, Matthew A.; Van Uffelen, Lora J.; Mercer, James A.; Andrew, Rex K.; Buck, Linda J.; Colosi, John A.; Howe, Bruce M. (Woods Hole Oceanographic Institution, 2008-12)
      These notes provide supporting information for a JASA (Journal of the Acoustical Society of America) LttE (Letter to the Editor) manuscript, "Deep seafloor arrivals: A new class of arrivals in long-range ocean acoustic ...