Now showing items 2880-2899 of 4897

  • A multi-sill magma plumbing system beneath the axis of the East Pacific Rise 

    Marjanovic, Milena; Carbotte, Suzanne M.; Carton, Helene; Nedimovic, Mladen R.; Mutter, John C.; Canales, J. Pablo (2014-09)
    The mid-crust axial magma lens detected at fast and intermediate spreading mid-ocean ridges is believed to be the primary magma reservoir for formation of upper oceanic crust. However, the mechanism behind formation of ...
  • Multibeam bathymetric surveys of submarine volcanoes and mega-pockmarks on the Chatham Rise, New Zealand 

    Collins, John A.; Molnar, Peter H.; Sheehan, Anne F. (2011-04)
    Multibeam bathymetric surveys east of the South Island of New Zealand present images of submarine volcanoes and pockmarks west of Urry Knolls on the Chatham Rise, and evidence of submarine erosion on the southern margin ...
  • Multicarrier communication over underwater acoustic channels with nonuniform Doppler shifts 

    Li, Baosheng; Zhou, Shengli; Stojanovic, Milica; Freitag, Lee E.; Willett, Peter (IEEE, 2008-04)
    Underwater acoustic (UWA) channels are wideband in nature due to the small ratio of the carrier frequency to the signal bandwidth, which introduces frequency-dependent Doppler shifts. In this paper, we treat the channel ...
  • Multichannel detection for wideband underwater acoustic CDMA communications 

    Stojanovic, Milica; Freitag, Lee E. (IEEE, 2006-07)
    Direct-sequence (DS) code-division multiple access (CDMA) is considered for future wideband mobile underwater acoustic networks, where a typical configuration may include several autonomous underwater vehicles (AUVs) ...
  • Multichannel maximum entropy method of spectral analysis applied to offshore structures 

    Briggs, Michael Jeffrey (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1981-06)
    The multichannel Maximum Entropy Method (MEM) of spectral analysis is developed and applied in the dynamic analysis of offshore structures. Two different algorithms are implemented and compared with the conventional ...
  • A multicoral calibration method to approximate a universal equation relating Sr/Ca and growth rate to sea surface temperature 

    Goodkin, Nathalie F.; Hughen, Konrad A.; Cohen, Anne L. (American Geophysical Union, 2007-03-01)
    Combining strontium-to-calcium ratios (Sr/Ca) with mean annual growth rates in Bermuda Diploria labyrinthiformis (brain corals) is shown to improve sea surface temperature (SST) calibrations relative to instrumental data. ...
  • Multidecadal mobility of the North Atlantic Oscillation 

    Moore, G. W. K.; Renfrew, Ian A.; Pickart, Robert S. (American Meteorological Society, 2013-04-15)
    The North Atlantic Oscillation (NAO) is one of the most important modes of variability in the global climate system and is characterized by a meridional dipole in the sea level pressure field, with centers of action near ...
  • A multidisciplinary Amazon Shelf SEDiment Study (AmasSeds) : physical oceanography moored array component 

    Alessi, Carol A.; Lentz, Steven J.; Beardsley, Robert C.; Castro, Belmiro Mendes; Geyer, W. Rockwell (Woods Hole Oceanographic Institution, 1992-09)
    A Multidisciplinary Amazon Shelf SEDiment Study (AmasSeds) is a cooperative research program by geological, chemical, physical, and biological oceanographers from Brazil and the United States to study sedimentary processes ...
  • Multipath time-delay estimation via the EM algorithm 

    Feder, Meir; Weinstein, Ehud (Woods Hole Oceanographic Institution, 1987-01)
    We consider the application of the EM algorithm to the multipath time delay estimation problem. The algorithm is developed for the case of deterministic (known) signals, as well as for the case of wide-sense stationary ...
  • Multiple approaches to microbial source tracking in tropical northern Australia 

    Neave, Matthew; Luter, Heidi; Padovan, Anna; Townsend, Simon; Schobben, Xavier; Gibb, Karen (John Wiley & Sons, 2014-09-16)
    Microbial source tracking is an area of research in which multiple approaches are used to identify the sources of elevated bacterial concentrations in recreational lakes and beaches. At our study location in Darwin, northern ...
  • Multiple convergence zone acoustic telemetry feasibility test report 

    Catipovic, Josko A.; von der Heydt, Keith; Merriam, John Stevens; Sandsmark, Geir Helge (Woods Hole Oceanographic Institution, 1991-11)
    This report describes a multiple CZ acoustic telemetry experiment conducted off the coast of California 1/28/90-2/2/90. The goal was to design a maximally robust high speed underwater modem suitable for data telemetry for ...
  • Multiple equilibria and low-frequency variability of wind-driven ocean models 

    Primeau, Francois W. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1998-06)
    The steady states of two models of the double-gyre wind-driven ocean circulation are studied. The link between the steady state solutions of the models and their time-mean and low-frequency variability is explored to ...
  • Multiple expressions of plume-ridge interaction in the Galapagos : volcanic lineaments and ridge jumps 

    Mittelstaedt, Eric; Soule, Samuel A.; Harpp, Karen S.; Fornari, Daniel J.; McKee, C.; Tivey, Maurice A.; Geist, Dennis J.; Kurz, Mark D.; Sinton, Christopher; Mello, C. (American Geophysical Union, 2012-05-31)
    Anomalous volcanism and tectonics between near-ridge mantle plumes and mid-ocean ridges provide important insights into the mechanics of plume-lithosphere interaction. We present new observations and analysis of multibeam, ...
  • A multiple proxy and model study of Cretaceous upper ocean temperatures and atmospheric CO2 concentrations 

    Bice, Karen L.; Birgel, Daniel; Meyers, Philip A.; Dahl, Kristina A.; Hinrichs, Kai-Uwe; Norris, Richard D. (American Geophysical Union, 2006-04-08)
    We estimate tropical Atlantic upper ocean temperatures using oxygen isotope and Mg/Ca ratios in well-preserved planktonic foraminifera extracted from Albian through Santonian black shales recovered during Ocean Drilling ...
  • Multiple source location estimation using the EM Algorithm 

    Weinstein, Ehud; Feder, Meir (Woods Hole Oceanographic Institution, 1986-07)
    We present a computationally efficient scheme for multiple source location estimation based on the EM Algorithm. The proposed scheme is optimal in the sense that it converges iteratively to the exact Maximum Likelihood ...
  • Multiple stressors of ocean ecosystems in the 21st century : projections with CMIP5 models 

    Bopp, Laurent; Resplandy, L.; Orr, James C.; Doney, Scott C.; Dunne, John P.; Gehlen, M.; Halloran, P.; Heinze, Christoph; Ilyina, T.; Seferian, R.; Tjiputra, Jerry; Vichi, Marcello (Copernicus Publications on behalf of the European Geosciences Union, 2013-10-02)
    Ocean ecosystems are increasingly stressed by human-induced changes of their physical, chemical and biological environment. Among these changes, warming, acidification, deoxygenation and changes in primary productivity by ...
  • Multiple sulfur isotope constraints on the modern sulfur cycle 

    Tostevin, Rosalie; Turchyn, Alexandra V.; Farquhar, James; Johnston, David T.; Eldridge, Daniel L.; Bishop, James K. B.; McIlvin, Matthew R. (Elsevier, 2014-04-16)
    We present 28 multiple sulfur isotope measurements of seawater sulfate (δ34SSO4δ34SSO4 and Δ33SSO4Δ33SSO4) from the modern ocean over a range of water depths and sites along the eastern margin of the Pacific Ocean. The ...
  • Multiple sulphur and iron isotope composition of detrital pyrite in Archaean sedimentary rocks : a new tool for provenance analysis 

    Hofmann, Axel; Bekker, Andrey; Rouxel, Olivier J.; Rumble, Douglas; Master, Sharad (2009-06-29)
    Multiple S (δ34S and δ33S) and Fe (δ56Fe) isotope analyses of rounded pyrite grains from 3.1 to 2.6 Ga conglomerates of southern Africa indicate their detrital origin, which supports anoxic surface conditions in the Archaean. ...
  • Multiple timescale processes drive ecosystem metabolism in eelgrass (Zostera marina) meadows 

    Rheuban, Jennie E.; Berg, Peter; McGlathery, Karen J. (Inter-Research, 2014-07-17)
    The oxygen flux between benthic ecosystems and the overlying water column is a measure of metabolic status and a commonly used proxy for carbon cycling. In this study, oxygen flux was measured seasonally using the eddy ...
  • Multiple-source heterotrophy fueled by aged organic carbon in an urbanized estuary 

    Griffith, David R.; Raymond, Peter A. (2010-08-02)
    The lower Hudson River is a highly urbanized estuary that receives large inputs of treated wastewater. To determine how organic matter from wastewater influences carbon cycling in this type of system, we measured chlorophyll ...