Now showing items 635-654 of 1038

  • 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 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 ...
  • Numerical simulations on megathrust rupture stabilized under strong dilatancy strengthening in slow slip region 

    Liu, Yajing (John Wiley & Sons, 2013-04-15)
    Episodic slow slip events (SSEs) typically involve a few millimeters to centimeters of slip over several days to months at depths near or further downdip of megathrust seismogenic zones. Despite its widespread presence in ...
  • Obliquity pacing of the late Pleistocene glacial terminations 

    Huybers, Peter; Wunsch, Carl (2005-01-24)
    The timing of glacial/interglacial cycles at intervals of about 100,000 yr (100 kyr) is commonly attributed to control by Earth orbital configuration variations. This “pacemaker” hypothesis has inspired many models, variously ...
  • OBSANP data acquisition system : operator's manual and system overview 

    McPeak, Sean P.; D'Spain, Gerald L.; Stephen, Ralph A.; von der Heydt, Keith; Worcester, Peter F. (Woods Hole Oceanographic Institution, 2013-10)
    On the Ocean Bottom Seismometer Augmentation in the North Pacific Experiment (OBSANP, June-July, 2013, R/V Melville), a VLA and twelve OBSs were deployed to listen to an active acoustic source, a J15-3. This report ...
  • OBSAPS data acquisition system : operator's manual and system overview 

    McPeak, Sean P.; D'Spain, Gerald L.; Stephen, Ralph A. (Woods Hole Oceanographic Institution, 2011-05)
    On the Ocean Bottom Seismometer Augmentation to the Philippine Sea Experiment (OBSAPS, April-May, 2011, R/V Revelle), a VLA and six OBSs were deployed to listen to an active acoustic source, a J15-3. This report describes ...
  • Observational and theoretical studies of the dynamics of mantle plume–mid-ocean ridge interaction 

    Ito, Garrett T.; Lin, Jian; Graham, David W. (American Geophysical Union, 2003-11-20)
    Hot spot–mid-ocean ridge interactions cause many of the largest structural and chemical anomalies in Earth's ocean basins. Correlated geophysical and geochemical anomalies are widely explained by mantle plumes that deliver ...
  • Observations of Li isotopic variations in the Trinity Ophiolite : evidence for isotopic fractionation by diffusion during mantle melting 

    Lundstrom, Craig C.; Chaussidon, Marc; Hsui, Albert T.; Kelemen, Peter B.; Zimmerman, Mark (2004-08-10)
    The Trinity peridotite (northern CA) contains numerous lithologic sequences consisting of dunite to harzburgite to spinel lherzolite to plagioclase lherzolite. Previous workers have documented geochemical gradients in these ...
  • Observed and modeled Greenland ice sheet snow accumulation, 1958-2003, and links with regional climate forcing 

    Hanna, Edward; McConnell, Joseph R.; Das, Sarah B.; Cappelen, John; Stephens, Ag (American Meteorological Society, 2006-02-01)
    Annual and monthly snow accumulation for the Greenland Ice Sheet was derived from ECMWF forecasts [mainly 40-yr ECMWR Re-Analysis (ERA-40)] and further meteorological modeling. Modeled accumulation was validated using 58 ...
  • Observing the Galápagos–EUC interaction : insights and challenges 

    Karnauskas, Kristopher B.; Murtugudde, Raghu; Busalacchi, Antonio J. (American Meteorological Society, 2010-12)
    Although sustained observations yield a description of the mean equatorial current system from the western Pacific to the eastern terminus of the Tropical Atmosphere Ocean (TAO) array, a comprehensive observational dataset ...
  • Ocean acidification not likely to affect the survival and fitness of two temperate benthic foraminiferal species : results from culture experiments 

    McIntyre-Wressnig, Anna; Bernhard, Joan M.; Wit, Johannes C.; McCorkle, Daniel C. (2014-10)
    Specimens of Bolivina argentea and Bulimina marginata, two widely distributed temperate benthic foraminiferal species, were cultured at constant temperature and controlled pCO2 (ambient, 1000 ppmv, and 2000 ppmv) for six ...