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The transport and mass balance of fallout radionuclides in Brotherswater, Cumbria (UK)

Appleby, P.G.; Semertzidou, P.; Piliposian, G.T.; Chiverrell, R.C.; Schillereff, D.N.; Warburton, J.J.

The transport and mass balance of fallout radionuclides in Brotherswater, Cumbria (UK) Thumbnail


Authors

P.G. Appleby

P. Semertzidou

G.T. Piliposian

R.C. Chiverrell

D.N. Schillereff



Abstract

This paper investigates the role of intervening transport processes on lake sediment records of the atmospherically deposited radionuclides 210Pb and 137Cs. Brotherswater is of particular interest to this issue in that its large catchment/lake area ratio and short water residence time are likely to amplify the influence of these processes, both from the catchment and through the water column. Brotherswater is also unique in being the site of two earlier multicore studies that, together with the present study, span a period of 4 decades. Measurements of fallout radionuclides were made on soil cores, suspended sediments and sediment cores, and the results combined with those from earlier studies to construct mass balances for 210Pb and 137Cs in Brotherswater. The results showed that catchment inputs accounted for 63% of 210Pb entering the lake. Further, just 47% of 210Pb entering the water column was delivered to the sediment record. For comparison, in an earlier study at nearby Blelham Tarn with a relatively smaller catchment but longer water residence time it was shown that 47% of 210Pb inputs were delivered via the catchment, 75% of which were delivered to the sediment record. Results from both sites suggest that 210Pb is predominantly transported on fine particulates with a mean particle size of 3–4 μm. Their relatively slow removal from the water column allows them to be transported relatively uniformly throughout the lake and may help account for the fact that simple 210Pb dating models are relatively reliable in spite of the complexities of the transport processes. Mass balance calculations for 137Cs are more complicated because of the variable fallout record. Measurements of 137Cs in the input stream and water column showed that catchment inputs are still significant 30 years after the last significant fallout (Chernobyl). Modelled results showed that catchment inputs delayed the date of peak inputs of weapons test fallout to the lake though by no more than 2 years. Although the results presented here are primarily concerned with fallout radionuclides and their reliability for dating, they also have implications for the use of sediment archives in reconstructing historical records of other atmospherically deposited substances such as trace metals or persistent organic pollutants.

Citation

Appleby, P., Semertzidou, P., Piliposian, G., Chiverrell, R., Schillereff, D., & Warburton, J. (2019). The transport and mass balance of fallout radionuclides in Brotherswater, Cumbria (UK). Journal of Paleolimnology, 62(4), 389-407. https://doi.org/10.1007/s10933-019-00095-z

Journal Article Type Article
Acceptance Date Sep 10, 2019
Online Publication Date Sep 27, 2019
Publication Date Dec 31, 2019
Deposit Date Sep 12, 2019
Publicly Available Date Oct 18, 2019
Journal Journal of Paleolimnology
Print ISSN 0921-2728
Electronic ISSN 1573-0417
Publisher Springer
Peer Reviewed Peer Reviewed
Volume 62
Issue 4
Pages 389-407
DOI https://doi.org/10.1007/s10933-019-00095-z

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Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/

Copyright Statement
Advance online version © The Author(s) 2019. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.





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