Mixing rates in Shagawa Lake,Minnesota, sediments as determined from 106Ru profiles |
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| Authors: | John Van Sickle Walter C Weimer David P Larsen |
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| Institution: | School of Oceanography, Oregon State University, Corvallis, OregonU.S.A.;Battelle, Pacific Northwest Laboratories, Richland, WashingtonUSA;Corvallis Environmental Research Laboratory, U.S. Environmental Protection Agency, Corvallis, OregonUSA |
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| Abstract: | Rates of surficial sediment mixing and sediment burial are measured in Shagawa Lake, Minnesota, using radionuclide tracers. Based on 106Ru profiles in 16 cores, mixing rates average 13 cm2/yr within the upper 9 cm of sediment. Two other nuclides, 210Pb and 137Cs, provide further evidence for calculation of mixing rates. In addition, 210Pb profiles estimate sediment burial rates (about 0.4 cm/yr). Mixing estimates are shown to be fairly insensitive both to uncertainties in sediment burial rates and to temporal patterns of 106Ru deposition. |
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| Keywords: | Author to whom correspondence should be addressed |
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