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Browsing Geology and Geophysics (G&G) by Author "Jenkins, William J."

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Browsing Geology and Geophysics (G&G) by Author "Jenkins, William J."

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  • Longworth, Brett E.; Robinson, Laura F.; Roberts, Mark L.; Beaupre, Steven R.; Burke, Andrea; Jenkins, William J. (2012-04-17)
    This paper describes a technique for measuring the 14C content of carbonate samples by producing C-ions directly in the negative ion sputter source of an accelerator mass spectrometer (AMS) system. This direct analysis ...
  • McIntyre, Cameron P.; Galutschek, Ernst; Roberts, Mark L.; von Reden, Karl F.; McNichol, Ann P.; Jenkins, William J. (Dept. of Geosciences, University of Arizona, 2010-08)
    Gas-accepting ion sources for radiocarbon accelerator mass spectrometry (AMS) have permitted the direct analysis of CO2 gas, eliminating the need to graphitize samples. As a result, a variety of analytical instruments can ...
  • Bond, Zoe A.; Cohen, Anne L.; Smith, Struan R.; Jenkins, William J. (American Geophysical Union, 2005-08-31)
    We used Secondary Ion Mass Spectrometry (SIMS) ion microprobe to analyze magnesium-to-calcium (Mg/Ca) and strontium-to-calcium (Sr/Ca) ratios of high-Mg calcite loculi within the skeleton of a shallow water gorgonian, ...
  • Roberts, Mark L.; Burton, Joshua R.; Elder, Kathryn L.; Longworth, Brett E.; McIntyre, Cameron P.; von Reden, Karl F.; Han, Baoxi; Rosenheim, Brad E.; Jenkins, William J.; Galutschek, Ernst; McNichol, Ann P. (Dept. of Geosciences, University of Arizona, 2010-08)
    A new and unique radiocarbon accelerator mass spectrometry (AMS) facility has been constructed at the Woods Hole Oceanographic Institution. The defining characteristic of the new system is its large-gap optical elements ...
  • Thiagarajan, Nivedita; Gerlach, Dana; Roberts, Mark L.; Burke, Andrea; McNichol, Ann P.; Jenkins, William J.; Subhas, Adam V.; Thresher, Ronald E.; Adkins, Jess F. (John Wiley & Sons, 2013-05-30)
    During the past 40,000 years, global climate has moved into and out of a full glacial period, with the deglaciation marked by several millennial-scale rapid climate change events. Here we investigate the ecological response ...
  • 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 ...
  • Roberts, Mark L.; Schneider, Robert J.; von Reden, Karl F.; Wills, J. S. C.; Han, Baoxi; Hayes, John M.; Rosenheim, Brad E.; Jenkins, William J. (2007-02)
    A gas-accepting microwave-plasma ion source is being developed for continuous-flow Accelerator Mass Spectrometry (AMS). Characteristics of the ion source will be presented. Schemes for connecting a gas or liquid chromatograph ...
  • McIntyre, Cameron P.; Roberts, Mark L.; Burton, Joshua R.; McNichol, Ann P.; Burke, Andrea; Robinson, Laura F.; von Reden, Karl F.; Jenkins, William J. (American Geophysical Union, 2011-11-05)
    Radiocarbon analyses of carbonate materials provide critical information for understanding the last glacial cycle, recent climate history and paleoceanography. Methods that reduce the time and cost of radiocarbon (14C) ...
  • von Reden, Karl F.; Roberts, Mark L.; Jenkins, William J.; Rosenheim, Brad E.; McNichol, Ann P.; Schneider, Robert J. (2007-09)
    The National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS) Facility at Woods Hole Oceanographic Institution is presently completing installation of a novel continuous-flow AMS system. A multi-year development of ...

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