Now showing items 766-785 of 984

  • Satellite-based estimates of Antarctic surface meltwater fluxes 

    Trusel, Luke D.; Frey, Karen E.; Das, Sarah B.; Munneke, Peter Kuipers; van den Broeke, Michiel R. (John Wiley & Sons, 2013-12-04)
    This study generates novel satellite-derived estimates of Antarctic-wide annual (1999–2009) surface meltwater production using an empirical relationship between radar backscatter from the QuikSCAT (QSCAT) satellite and ...
  • Satellite-derived sea surface temperature, mesoscale variability, and foraminiferal production in the North Atlantic 

    Wolfteich, Carl M. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1994-02)
    Planktonic foraminiferal flux was collected at four sediment trap locations spanning a 34° latitude range in the North Atlantic during 1988-1990. Satellite-derived sea surface temperature (SST) and CTD data were integrated ...
  • Scale length of mantle heterogeneities : constraints from helium diffusion 

    Hart, Stanley R.; Kurz, Mark D.; Wang, Z. (2008-02-23)
    A model of coupled He production/diffusion is used to constrain the question of whether Earth’s peridotitic mantle contains ubiquitous mesoscale veins or slabs of other lithologies. The high diffusion rates of helium ...
  • Scaling relations for seismic cycles on mid-ocean ridge transform faults 

    Boettcher, Margaret S.; McGuire, Jeffrey J. (American Geophysical Union, 2009-11-04)
    Mid-ocean ridge transform faults (RTFs) have thermal structures that vary systematically with tectonic parameters, resulting in predictable seismic characteristics and clear seismic cycles. We develop a scaling relation ...
  • A sea of Lilliputians 

    Aubry, Marie-Pierre (2008-05-27)
    Smaller size is generally seen as a negative response of organisms to stressful environmental conditions, associated with low diversity and species dominance. The mean size of the coccolithophorids decreased through the ...
  • Sea surface temperature pattern reconstructions in the Arabian Sea 

    Dahl, Kristina A.; Oppo, Delia W. (American Geophysical Union, 2006-03-28)
    Sea surface temperature (SST) and seawater δ18O (δ18Ow) were reconstructed in a suite of sediment cores from throughout the Arabian Sea for four distinct time intervals (0 ka, 8 ka, 15 ka, and 20 ka) with the aim of ...
  • Seafloor photo-geology and sonar terrain modeling at the 9°N overlapping spreading center, East Pacific Rise 

    Klein, Emily M.; White, Scott M.; Nunnery, James Andrew; Mason-Stack, Jessica L.; Wanless, V. Dorsey; Perfit, Michael R.; Waters, Christopher L.; Sims, Kenneth W. W.; Fornari, Daniel J.; Zaino, Anne J.; Ridley, W. Ian (John Wiley & Sons, 2013-12-20)
    A fundamental goal in the study of mid-ocean ridges is to understand the relationship between the distribution of melt at depth and seafloor features. Building on geophysical information on subsurface melt at the 9°N ...
  • Seafloor seismic monitoring of an active submarine volcano : local seismicity at Vailulu'u Seamount, Samoa 

    Konter, Jasper G.; Staudigel, Hubert; Hart, Stanley R.; Shearer, P. M. (American Geophysical Union, 2004-06-26)
    We deployed five ocean bottom hydrophones (OBHs) for a 1-year seismic monitoring study of Vailulu'u Seamount, the youngest and easternmost volcano in the Samoan Archipelago. Four instruments were placed on the summit crater ...
  • Seals map bathymetry of the Antarctic continental shelf 

    Padman, Laurie; Costa, Daniel P.; Bolmer, S. Thompson; Goebel, Michael E.; Huckstadt, Luis A.; Jenkins, Adrian; McDonald, Birgitte I.; Shoosmith, Deborah R. (American Geophysical Union, 2010-11-03)
    We demonstrate the first use of marine mammal dive-depth data to improve maps of bathymetry in poorly sampled regions of the continental shelf. A group of 57 instrumented elephant seals made on the order of 2 × 105 dives ...
  • A search for layering in the oceanic crust 

    Collins, John A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1988-10-06)
    The results of numerous seismic refraction and reflection experiments have shown that the seismic structure of the oceanic crust can be usefully parameterized by a small number of locally horizontal layers within which ...
  • Searching for the oldest baobab of Madagascar : radiocarbon investigation of large Adansonia rubrostipa trees 

    Patrut, Adrian; von Reden, Karl F.; Danthu, Pascal; Pock-Tsy, Jean-Michel Leong; Patrut, Roxana T.; Lowy, Daniel A. (Public Library of Science, 2015-03-25)
    We extended our research on the architecture, growth and age of trees belonging to the genus Adansonia, by starting to investigate large individuals of the most widespread Malagasy species. Our research also intends to ...
  • Seasonal evolution of water contributions to discharge from a Greenland outlet glacier : insight from a new isotope-mixing model 

    Bhatia, Maya P.; Das, Sarah B.; Kujawinski, Elizabeth B.; Henderson, Paul B.; Burke, Andrea; Charette, Matthew A. (International Glaciological Society, 2011-10-01)
    The Greenland ice sheet (GrIS) subglacial hydrological system may undergo a seasonal evolution, with significant geophysical and biogeochemical implications. We present results from a new isotope-mixing model to quantify ...
  • Seasonality and stable isotopes in planktonic foraminifera off Cape Cod, Massachusetts 

    Keigwin, Lloyd D.; Bice, Marley; Copley, Nancy J. (American Geophysical Union, 2005-07-18)
    Monthly samples of stratified plankton tows taken from the slope waters off Cape Cod nearly 25 years ago are used to describe the seasonal succession of planktonic foraminifera and their oxygen isotope ratios. The 15°C ...
  • Seasonally resolved ice core records from West Antarctica indicate a sea ice source of sea-salt aerosol and a biomass burning source of ammonium 

    Pasteris, Daniel R.; McConnell, Joseph R.; Das, Sarah B.; Criscitiello, Alison S.; Evans, Matthew J.; Maselli, Olivia J.; Sigl, Michael; Layman, Lawrence (John Wiley & Sons, 2014-07-21)
    The sources and transport pathways of aerosol species in Antarctica remain uncertain, partly due to limited seasonally resolved data from the harsh environment. Here, we examine the seasonal cycles of major ions in three ...
  • Seawater isotope constraints on tropical hydrology during the Holocene 

    Oppo, Delia W.; Schmidt, Gavin A.; LeGrande, Allegra N. (American Geophysical Union, 2007-07-03)
    Paleoceanographic data from the low latitude Pacific Ocean provides evidence of changes in the freshwater budget and redistribution of freshwater within the basin during the Holocene. Reconstructed Holocene seawater δ 18O ...
  • A secondary ionization mass spectrometry calibration of Cibicidoides pachyderma Mg/Ca with temperature 

    Curry, William B.; Marchitto, Thomas M. (American Geophysical Union, 2008-04-04)
    An evaluation of C. pachyderma Mg/Ca using a new suite of warm water multicores from the Florida Straits shows that the slope of Mg/Ca with temperature is shallower than previously thought. Using secondary ionization mass ...
  • Sediment drifts and cold-water coral reefs in the Patagonian upper and middle continental slope 

    Munoz, Araceli; Cristobo, J.; Rios, P.; Druet, M.; Polonio, V.; Uchupi, Elazar; Acosta, Juan; Iglesias, S.; Portela, J.; del Rio, J. L.; Parra, S.; Sacau, M.; Vilela, R.; Patrocinio, T.; Almon, B.; Elvira, E.; Jimenez, P.; Fontan, A.; Alcala, C.; Lopez, V. (2012-05)
    The north flowing Falkland / Malvinas Current has generated sediment drifts at a depth of 1200-1600 m in the Patagonian middle continental slope out of early Holocene hemipelagics, late Pleistocene ice rafted clastics, and ...
  • Sediment flux and recent paleoclimate in Jordan Basin, Gulf of Maine 

    Keigwin, Lloyd D.; Pilskaln, Cynthia H. (2014-10-09)
    We report planktonic foraminiferal fluxes (accumulation rates) and oxygen isotopes (δ18O) from a nine-month sediment trap deployment, and δ18O from three sediment cores in Jordan Basin, Gulf of Maine. The sediment trap was ...
  • Sedimentary evidence of hurricane strikes in western Long Island, New York 

    Scileppi, Elyse; Donnelly, Jeffrey P. (American Geophysical Union, 2007-06-21)
    Evidence of historical landfalling hurricanes and prehistoric storms has been recovered from backbarrier environments in the New York City area. Overwash deposits correlate with landfalls of the most intense documented ...
  • Sedimentary processes on the continental slope off New England 

    MacIlvaine, Joseph Chad (Woods Hole Oceanographic Institution, 1973-09)
    A detailed study of a small (5000 km2) area of the continental slope south of Cape Cod, Massachusetts, was conducted. Bathymetry, 3.5 kHz profiles, seismic profiles, suspended sediment analysis, bottom photographs, television ...