Distributions of nuclear fuel-reprocessing tracers in the Arctic Ocean: Indications of Russian river influence
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1999
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Abstract
Radionuclidesampling in 1986 and 1993 in the Canada Basin, and in 1993 in theAmundsen Basin and on the adjacent Laptev shelf, provides new insights into the origin, timing, pathways, and mechanisms for dispersal of non-fallout radioactive tracers in the Arctic Ocean. First, samples from the Beaufort Sea shelf, slope, and adjacentbasin show a four-fold increase in 129I concentrationsfrom 1986 to 1993. Second, anthropogenic non-fallout radionuclide concentrations in the Beaufort Sea increasewith proximity to slope boundarycurrents.Third, there is evidence for riverine contributions of anthropogenic radionuclides to surface waters of the Amundsen Basin and the Laptev continental shelf. This evidence includes high surface water burdens of 237Np and 129I, with the maximum in anthropogenic129I found in the least saline andmost 18O-depletedwaters, consistentwith an origin in high-latitude runoff.Additionally, the 237Np/129I atom ratios in the Laptev Sea andAmundsen Basin in 1993 were signi cantly lower than observed elsewhere in the Arctic Ocean and can be reasonably explained by 129I added during transit of the Russian shelves. The 240Pu/239Pu ratios in the water column were mostly near 0.18, consistent both with stratospheric bomb fallout and with the discharged-weighted mean Sella eld ratio during 1966–1985. In the least saline water samples collected at the most shallow Laptev shelf station, however, the Pu ratios were lower, consistentwith a non-Europeannuclear fuel reprocessingsource.There are clear secondarymaxima in 237Np and 129I 1. Environmental Science Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee, 37831-6038,U.S.A. email: jg9@ornl.gov 2. U.S. Department of Energy, 201 Varick Street, Fifth Floor, New York, New York, 10014,U.S.A. 3. Current address: 7 Pine Cone Lane, Sparta, New Jersey, 07871,U.S.A. 4. Polar Science Center, Applied Physics Laboratory, University of Washington, Seattle, Washington, 98195, U.S.A. 5. Paci c Northwest National Laboratory, Battelle Boulevard, Richland,Washington, 99352,U.S.A. 6. Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, Tennessee, 37996, U.S.A. Journal of Marine Research, 57, 715–738, 1999
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| Authors | Lee W. Cooper, T.M. Beasley, Knut Aagaard, James M. Kelley, I.L. Larsen, Jacqueline M. Grebmeier |
| Journal | journal of marine research |
| Year | 1999 |
| DOI |
10.1357/002224099321560546
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| URL | |
| Keywords | Keywords not found |
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