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    Th-230 and Pa-231 on GEOTRACES GA03, the US GEOTRACES North Atlantic transect, and implications for modern and paleoceanographic chemical fluxes

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    Hayes et al 2015 DSR-II_for AC.pdf (10.30Mb)
    Date
    2014-07
    Author
    Hayes, Christopher T.  Concept link
    Anderson, Robert F.  Concept link
    Fleisher, Martin Q.  Concept link
    Huang, Kuo-Fang  Concept link
    Robinson, Laura F.  Concept link
    Lu, Yanbin  Concept link
    Cheng, Hai  Concept link
    Edwards, R. Lawrence  Concept link
    Moran, S. Bradley  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/7377
    As published
    https://doi.org/10.1016/j.dsr2.2014.07.007
    Keyword
     GEOTRACES; North Atlantic Ocean; Thorium; Protactinium; Scavenging; Ventilation 
    Abstract
    The long-lived uranium decay products 230Th and 231Pa are widely used as quantitative tracers of adsorption to sinking particles (scavenging) in the ocean by exploiting the principles of radioactive disequilibria. Because of their preservation in the Pleistocene sediment record and through largely untested assumptions about their chemical behavior in the water column, the two radionuclides have also been used as proxies for a variety of chemical fluxes in the past ocean. This includes the vertical flux of particulate matter to the seafloor, the lateral flux of insoluble elements to continental margins (boundary scavenging), and the southward flux of water out of the deep North Atlantic. In a section of unprecedented vertical and zonal resolution, the distributions of 230Th and 231Pa across the North Atlantic shed light on the marine cycling of these radionuclides and further inform their use as tracers of chemical flux. Enhanced scavenging intensities are observed in benthic layers of resuspended sediments on the eastern and western margins and in a hydrothermal plume emanating from the Mid-Atlantic Ridge. Boundary scavenging is clearly expressed in the water column along a transect between Mauritania and Cape Verde which is used to quantify a bias in sediment fluxes calculated using 230Th-normalization and to demonstrate enhanced 231Pa removal from the deep North Atlantic by this mechanism. The influence of deep ocean ventilation that leads to the southward export of 231Pa is apparent. The 231Pa/230Th ratio, however, predominantly reflects spatial variability in scavenging intensity, complicating its applicability as a proxy for the Atlantic meridional overturning circulation.
    Description
    Author Posting. © The Author(s), 2014. This is the author's version of the work. It is posted here by permission of Elsevier for personal use, not for redistribution. The definitive version was published in Deep Sea Research Part II: Topical Studies in Oceanography 116 (2015): 29-41, doi:10.1016/j.dsr2.2014.07.007.
    Collections
    • Geology and Geophysics (G&G)
    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Preprint: Hayes, Christopher T., Anderson, Robert F., Fleisher, Martin Q., Huang, Kuo-Fang, Robinson, Laura F., Lu, Yanbin, Cheng, Hai, Edwards, R. Lawrence, Moran, S. Bradley, "Th-230 and Pa-231 on GEOTRACES GA03, the US GEOTRACES North Atlantic transect, and implications for modern and paleoceanographic chemical fluxes", 2014-07, https://doi.org/10.1016/j.dsr2.2014.07.007, https://hdl.handle.net/1912/7377
     

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