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Post-depositional 137Cs Mobility in the Sediments of Three Shallow Coastal Lagoons, SW England

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Abstract

We present 137Cs profiles for three low lying coastal lagoons in Southwest England that show a decline in activity with sediment depth. 137Cs inventories are lower than expected by comparison with local reference inventories despite the fact that sampling was undertaken in the deep-water zone of each lake where sediment and 137Cs focusing would be expected. At all three locations, lake sediment 7Be and unsupported 210Pb  (210Pbun) inventories are not significantly lower than the local reference inventory. 137Cs inventories in the study cores range from 38 to 95% of local reference inventories. The standing water level and mud: water interface at two sites are below maximum tide level and, at all three sites, salinity increases significantly in the water columns between low and high tide and in the pore waters of the underlying sediments. We suggest that the difference in hydrostatic pressure between sea level and standing water levels in the lagoons forces salt water up through the sediment column and that monovalent cations (especially Na+ and K+) replace 137Cs on exchange sites leading to the upward migration and loss of 137Cs. Rising sea levels may therefore contribute to remobilisation and release of 137Cs to the aquatic environment from the sediments of coastal lagoons.

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Authors and Affiliations

  1. Centre for Environmental Research and Consultancy, Coventry University, Priory St., Coventry, CV1 5FB, UK

    I. D. L. Foster & H. Proffitt

  2. Department of Geography and Environment, University of Aberdeen, Elphinstone Road, Aberdeen, AB24 3UF, UK

    T. M. Mighall

  3. Department of Geography, University of Exeter, Rennes Drive, Exeter, EX4 4RJ, UK

    D. E. Walling

  4. National Soil Resources Institute (NSRI), Cranfield University, North Wyke Research Station, EX20 2SB, Okehampton, Devon, UK

    P. N. Owens

  5. Geography Department, Rhodes University, Grahamstown 6140, Eastern Cape, South Africa

    I. D. L. Foster

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  1. I. D. L. Foster
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  2. T. M. Mighall
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  3. H. Proffitt
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  4. D. E. Walling
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Correspondence to I. D. L. Foster.

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Foster, I.D.L., Mighall, T.M., Proffitt, H. et al. Post-depositional 137Cs Mobility in the Sediments of Three Shallow Coastal Lagoons, SW England. J Paleolimnol 35, 881–895 (2006). https://doi.org/10.1007/s10933-005-6187-6

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