Recent 210Pb, 137Cs and 241Am accumulation in an ombrotrophic peatland from Amsterdam Island (Southern Indian Ocean)
Over the past 50 years, 210Pb, 137Cs and 241Am have been abundantly used in reconstructing recent sediment and peat chronologies. The study of global aerosol-climate interaction is also partially depending on our understanding of 222Rn-210Pb cycling, as radionuclides are useful aerosol tracers. Howe...
Published in: | Journal of Environmental Radioactivity |
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Online Access: | https://lup.lub.lu.se/record/92437957-84bc-4ede-ab25-f00185f74702 https://doi.org/10.1016/j.jenvrad.2017.05.004 |
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ftulundlup:oai:lup.lub.lu.se:92437957-84bc-4ede-ab25-f00185f74702 2024-02-11T09:55:13+01:00 Recent 210Pb, 137Cs and 241Am accumulation in an ombrotrophic peatland from Amsterdam Island (Southern Indian Ocean) Li, Chuxian Le Roux, Gaël Sonke, Jeroen van Beek, Pieter Souhaut, Marc Van der Putten, Nathalie De Vleeschouwer, François 2017-09-01 https://lup.lub.lu.se/record/92437957-84bc-4ede-ab25-f00185f74702 https://doi.org/10.1016/j.jenvrad.2017.05.004 eng eng Elsevier https://lup.lub.lu.se/record/92437957-84bc-4ede-ab25-f00185f74702 http://dx.doi.org/10.1016/j.jenvrad.2017.05.004 scopus:85019934127 pmid:28554139 wos:000404310100019 Journal of Environmental Radioactivity; 175-176, pp 164-169 (2017) ISSN: 0265-931X Geosciences Multidisciplinary Cs Pb Am Peat Radionuclides Southern indian ocean contributiontojournal/article info:eu-repo/semantics/article text 2017 ftulundlup https://doi.org/10.1016/j.jenvrad.2017.05.004 2024-01-17T23:29:27Z Over the past 50 years, 210Pb, 137Cs and 241Am have been abundantly used in reconstructing recent sediment and peat chronologies. The study of global aerosol-climate interaction is also partially depending on our understanding of 222Rn-210Pb cycling, as radionuclides are useful aerosol tracers. However, in comparison with the Northern Hemisphere, few data are available for these radionuclides in the Southern Hemisphere, especially in the South Indian Ocean. A peat core was collected in an ombrotrophic peatland from the remote Amsterdam Island (AMS) and was analyzed for 210Pb, 137Cs and 241Am radionuclides using an underground ultra-low background gamma spectrometer. The 210Pb Constant Rate of Supply (CRS) model of peat accumulations is validated by peaks of artificial radionuclides (137Cs and 241Am) that are related to nuclear weapon tests. We compared the AMS 210Pb data with an updated 210Pb deposition database. The 210Pb flux of 98 ± 6 Bq·m−2·y−1 derived from the AMS core agrees with data from Madagascar and South Africa. The elevated flux observed at such a remote location may result from the enhanced 222Rn activity and frequent rainfall in AMS. This enhanced 222Rn activity itself may be explained by continental air masses passing over southern Africa and/or Madagascar. The 210Pb flux at AMS is higher than those derived from cores collected in coastal areas in Argentina and Chile, which are areas dominated by marine westerly winds with low 222Rn activities. We report a 137Cs inventory at AMS of 144 ± 13 Bq·m−2 (corrected to 1969). Our data thus contribute to the under-represented data coverage in the mid-latitudes of the Southern Hemisphere. Article in Journal/Newspaper Amsterdam Island Lund University Publications (LUP) Indian Argentina Journal of Environmental Radioactivity 175-176 164 169 |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Geosciences Multidisciplinary Cs Pb Am Peat Radionuclides Southern indian ocean |
spellingShingle |
Geosciences Multidisciplinary Cs Pb Am Peat Radionuclides Southern indian ocean Li, Chuxian Le Roux, Gaël Sonke, Jeroen van Beek, Pieter Souhaut, Marc Van der Putten, Nathalie De Vleeschouwer, François Recent 210Pb, 137Cs and 241Am accumulation in an ombrotrophic peatland from Amsterdam Island (Southern Indian Ocean) |
topic_facet |
Geosciences Multidisciplinary Cs Pb Am Peat Radionuclides Southern indian ocean |
description |
Over the past 50 years, 210Pb, 137Cs and 241Am have been abundantly used in reconstructing recent sediment and peat chronologies. The study of global aerosol-climate interaction is also partially depending on our understanding of 222Rn-210Pb cycling, as radionuclides are useful aerosol tracers. However, in comparison with the Northern Hemisphere, few data are available for these radionuclides in the Southern Hemisphere, especially in the South Indian Ocean. A peat core was collected in an ombrotrophic peatland from the remote Amsterdam Island (AMS) and was analyzed for 210Pb, 137Cs and 241Am radionuclides using an underground ultra-low background gamma spectrometer. The 210Pb Constant Rate of Supply (CRS) model of peat accumulations is validated by peaks of artificial radionuclides (137Cs and 241Am) that are related to nuclear weapon tests. We compared the AMS 210Pb data with an updated 210Pb deposition database. The 210Pb flux of 98 ± 6 Bq·m−2·y−1 derived from the AMS core agrees with data from Madagascar and South Africa. The elevated flux observed at such a remote location may result from the enhanced 222Rn activity and frequent rainfall in AMS. This enhanced 222Rn activity itself may be explained by continental air masses passing over southern Africa and/or Madagascar. The 210Pb flux at AMS is higher than those derived from cores collected in coastal areas in Argentina and Chile, which are areas dominated by marine westerly winds with low 222Rn activities. We report a 137Cs inventory at AMS of 144 ± 13 Bq·m−2 (corrected to 1969). Our data thus contribute to the under-represented data coverage in the mid-latitudes of the Southern Hemisphere. |
format |
Article in Journal/Newspaper |
author |
Li, Chuxian Le Roux, Gaël Sonke, Jeroen van Beek, Pieter Souhaut, Marc Van der Putten, Nathalie De Vleeschouwer, François |
author_facet |
Li, Chuxian Le Roux, Gaël Sonke, Jeroen van Beek, Pieter Souhaut, Marc Van der Putten, Nathalie De Vleeschouwer, François |
author_sort |
Li, Chuxian |
title |
Recent 210Pb, 137Cs and 241Am accumulation in an ombrotrophic peatland from Amsterdam Island (Southern Indian Ocean) |
title_short |
Recent 210Pb, 137Cs and 241Am accumulation in an ombrotrophic peatland from Amsterdam Island (Southern Indian Ocean) |
title_full |
Recent 210Pb, 137Cs and 241Am accumulation in an ombrotrophic peatland from Amsterdam Island (Southern Indian Ocean) |
title_fullStr |
Recent 210Pb, 137Cs and 241Am accumulation in an ombrotrophic peatland from Amsterdam Island (Southern Indian Ocean) |
title_full_unstemmed |
Recent 210Pb, 137Cs and 241Am accumulation in an ombrotrophic peatland from Amsterdam Island (Southern Indian Ocean) |
title_sort |
recent 210pb, 137cs and 241am accumulation in an ombrotrophic peatland from amsterdam island (southern indian ocean) |
publisher |
Elsevier |
publishDate |
2017 |
url |
https://lup.lub.lu.se/record/92437957-84bc-4ede-ab25-f00185f74702 https://doi.org/10.1016/j.jenvrad.2017.05.004 |
geographic |
Indian Argentina |
geographic_facet |
Indian Argentina |
genre |
Amsterdam Island |
genre_facet |
Amsterdam Island |
op_source |
Journal of Environmental Radioactivity; 175-176, pp 164-169 (2017) ISSN: 0265-931X |
op_relation |
https://lup.lub.lu.se/record/92437957-84bc-4ede-ab25-f00185f74702 http://dx.doi.org/10.1016/j.jenvrad.2017.05.004 scopus:85019934127 pmid:28554139 wos:000404310100019 |
op_doi |
https://doi.org/10.1016/j.jenvrad.2017.05.004 |
container_title |
Journal of Environmental Radioactivity |
container_volume |
175-176 |
container_start_page |
164 |
op_container_end_page |
169 |
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1790594512650764288 |