Now showing items 4873-4892 of 7061

  • Particle export during the Southern Ocean Iron Experiment (SOFeX) 

    Buesseler, Ken O.; Andrews, J. E.; Pike, Steven M.; Charette, Matthew A.; Goldson, Laura E.; Brzezinski, Mark A.; Lance, V. P. (2004-07-26)
    We studied the effect of iron addition on particle export in the Southern Ocean by measuring changes in the distribution of thorium-234 during a 4 week Fe enrichment experiment conducted in the high-silicate high-nitrate ...
  • Particle export from the upper ocean over the continental shelf of the west Antarctic Peninsula: A long-term record, 1992–2007 

    Ducklow, Hugh W.; Erickson, Matthew; Kelly, Joann; Montes-Hugo, Martin; Ribic, Christine A.; Smith, Raymond C.; Stammerjohn, Sharon E.; Karl, David M. (2008-03)
    We report on results of a long-term (1993-2007) time series sediment trap moored at 170 m to the west of the Antarctic Peninsula in the mid-continental shelf region (350 m depth; 64º30’ S, 66º00’ W). This is a region ...
  • Particle Flux in the deep Sargasso Sea : the 35-Year Oceanic Flux Program time series 

    Conte, Maureen H.; Weber, John C. (The Oceanography Society, 2014-03)
    The Oceanic Flux Program (OFP) sediment trap time series, the longest running time series of its kind, has continuously measured particle fluxes in the deep Sargasso Sea since 1978. OFP results provided the first direct ...
  • Particle flux in the Western Black Sea in the present and over the last 5,000 years : temporal variability, sources, transport mechanisms 

    Hay, Bernward J. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1987-09)
    The particle flux in the present and over the last 5,000 years was investigated in the Black Sea in a comparative study with samples from time-series sediment traps and laminated core sediments. The sediment trap samples ...
  • Particle fluxes associated with mesoscale eddies in the Sargasso Sea 

    Buesseler, Ken O.; Lamborg, Carl H.; Cai, Pinghe; Escoube, Raphaelle; Johnson, Rodney J.; Pike, Steven M.; Masque, Pere; McGillicuddy, Dennis J.; Verdeny, E. (2007-09-25)
    We examined the impact of a cyclonic eddy and mode-water eddy on particle flux in the Sargasso Sea. The primary method used to quantify flux was based upon measurements of the natural radionuclide, 234Th, and these flux ...
  • Particle transport in horizontal convection : implications for the "Sandström theorem" 

    Marchal, Olivier (2006-04-25)
    The 'Sandström theorem' as interpreted by Jeffreys (1925) is that in a flow maintained by a temperature difference, the pathline from the cold region to the warm region must lie below the return path. A formal demonstration ...
  • Particulate matter sinking to the deep-sea floor at 2000 M in the Tongue of the Ocean, Bahamas, with a description of a new sedimentation trap 

    Wiebe, Peter H.; Boyd, Steven H.; Winget, Clifford L. (Woods Hole Oceanographic Institution, 1976-09)
    A sedimentation trap for use just above the deep-sea floor was free-fallen to a depth of 2050 m in the Tongue of the Ocean canyon on January 3, 1974. On March 6, it was successfully recovered with the assistance of ...
  • Partitioning of sediment on the shelf offshore of the Columbia River littoral cell 

    Twichell, David C.; Cross, VeeAnn A.; Peterson, Curt D. (Elsevier B.V., 2010-02-11)
    Sediment derived from the Columbia River has been deposited on the continental shelf, along the barriers and beaches, and in the bays of the Oregon and Washington coast during the Holocene. The barrier and beach deposits ...
  • Partitioning of strontium between calcite and fluid 

    Gabitov, R. I.; Watson, E. B. (American Geophysical Union, 2006-11-07)
    The Sr/Ca ratio of biogenic carbonate is widely used as a proxy for paleotemperature. This application is supported by empirical calibrations of Sr/Ca as a function of temperature, but it is also known that Sr uptake in ...
  • The passage of the bomb radiocarbon pulse into the Pacific Ocean 

    Jenkins, William J.; Elder, Kathryn L.; McNichol, Ann P.; von Reden, Karl F. (Dept. of Geosciences, University of Arizona, 2010-08)
    We report and compare radiocarbon observations made on 2 meridional oceanographic sections along 150°W in the South Pacific in 1991 and 2005. The distributions reflect the progressive penetration of nuclear weapons-produced ...
  • Passive acoustic detection of deep-diving beaked whales 

    Zimmer, Walter M. X.; Harwood, John; Tyack, Peter L.; Johnson, Mark P.; Madsen, Peter T. (Acoustical Society of America, 2008-11)
    Beaked whales can remain submerged for an hour or more and are difficult to sight when they come to the surface to breathe. Passive acoustic detection (PAD) not only complements traditional visual-based methods for detecting ...
  • A passive capture latch for ODYSSEY-class AUVs 

    Bowen, Martin F. (Woods Hole Oceanographic Institution, 1998-06-12)
    Under subcontract to the Massachusetts Institute of Techology's (MIT) Sea Grant Autonomous Ocean Sampling Network (AOSN) program, the Woods Hole Oceanographic Institution's Deep Submergence Laboratory (WHOI-DSL) produced ...
  • Passive energy recapture in jellyfish contributes to propulsive advantage over other metazoans 

    Gemmell, Brad J.; Costello, John H.; Colin, Sean P.; Stewart, Colin J.; Dabiri, John O.; Tafti, Danesh; Priya, Shashank (2013-08)
    Gelatinous zooplankton populations are well known for their ability to take over perturbed ecosystems. The ability of these animals to outcompete and functionally replace fish that exhibit an effective visual predatory ...
  • Passive localization of underwater acoustic beacons 

    Wojcik, Dennis M. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1993-09)
    This thesis examines the use of a single, omnidirectional hydrophone as a receiving sensor to passively localize an acoustic beacon. The localization problem is presented as a constrained, nonlinear parameter estimation ...
  • Passive time reversal acoustic communications through shallow-water internal waves 

    Song, Aijun; Badiey, Mohsen; Newhall, Arthur E.; Lynch, James F.; DeFerrari, Harry A.; Katsnelson, Boris G. (IEEE, 2010-11-30)
    During a 12-h period in the 2006 Shallow Water Experiment (SW06), binary phase shift keying (BPSK) signals at the carrier frequencies of 813 and 1627 Hz were propagated over a 19.8-km source–receiver range when a packet ...
  • Passive wake detection using seal whisker-inspired sensing 

    Beem, Heather R. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2015-02)
    This thesis is motivated by biological experiments, which display the harbor seal's ability to track the wake of an object several seconds after it swam by. In this work, I elucidate the basic fluid mechanisms that seals ...
  • Past, present, and future roles of long-term experiments in the LTER Network 

    Knapp, Alan K.; Smith, Melinda D.; Hobbie, Sarah E.; Collins, Scott L.; Fahey, Timothy J.; Hansen, Gretchen J. A.; Landis, Douglas A.; La Pierre, Kimberly J.; Melillo, Jerry M.; Seastedt, Timothy R.; Shaver, Gaius R.; Webster, Jackson R. (American Institute of Biological Sciences, 2012-04)
    The US National Science Foundation—funded Long Term Ecological Research (LTER) Network supports a large (around 240) and diverse portfolio of long-term ecological experiments. Collectively, these long-term experiments have ...
  • Pathogenic forms of tau inhibit kinesin-dependent axonal transport through a mechanism involving activation of axonal phosphotransferases 

    Kanaan, Nicholas M.; Morfini, Gerardo A.; LaPointe, Nichole E.; Pigino, Gustavo F.; Patterson, Kristina R.; Song, Yuyu; Andreadis, Athena; Fu, Yifan; Brady, Scott T.; Binder, Lester I. (Society for Neuroscience, 2011-07-06)
    Aggregated filamentous forms of hyperphosphorylated tau (a microtubule-associated protein) represent pathological hallmarks of Alzheimer's disease (AD) and other tauopathies. While axonal transport dysfunction is thought ...
  • Pathogenic huntingtin inhibits fast axonal transport by activating JNK3 and phosphorylating kinesin 

    Morfini, Gerardo A.; You, Yi-Mei; Pollema, Sarah L.; Kaminska, Agnieszka; Liu, Katherine; Yoshioka, Katsuji; Bjorkblom, Benny; Coffey, Eleanor T.; Bagnato, Carolina; Han, David; Huang, Chun-Fang; Banker, Gary; Pigino, Gustavo F.; Brady, Scott T. (2009-04-28)
    Selected vulnerability of neurons in Huntington’s disease (HD) suggests alterations in a cellular process particularly critical for neuronal function. Supporting this idea, pathogenic Htt (polyQ-Htt) inhibits fast axonal ...