Recent 210 Pb, 137 Cs and 241 Am 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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Format: | Article in Journal/Newspaper |
Language: | English |
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Online Access: | https://oatao.univ-toulouse.fr/20952/ https://oatao.univ-toulouse.fr/20952/7/Li_20952.pdf https://doi.org/10.1016/j.jenvrad.2017.05.004 |
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ftunivtoulouseoa:oai:oatao.univ-toulouse.fr:20952 2023-05-15T13:22:27+02:00 Recent 210 Pb, 137 Cs and 241 Am accumulation in an ombrotrophic peatland from Amsterdam Island (Southern Indian Ocean) Li, Chuxian Le Roux, Gaël Sonke, Jeroen E. Van Beek, Pieter Souhaut, Marc Van der Putten, Nathalie De Vleeschouwer, François Centre National d'Études Spatiales - CNES (FRANCE) Centre National de la Recherche Scientifique - CNRS (FRANCE) Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE) Institut de Recherche pour le Développement - IRD (FRANCE) Université Toulouse III - Paul Sabatier - UT3 (FRANCE) Lund University (SWEDEN) 2017-09 application/pdf https://oatao.univ-toulouse.fr/20952/ https://oatao.univ-toulouse.fr/20952/7/Li_20952.pdf https://doi.org/10.1016/j.jenvrad.2017.05.004 en eng Elsevier https://oatao.univ-toulouse.fr/20952/7/Li_20952.pdf HAL : hal-03512169 Li, Chuxian and Le Roux, Gaël and Sonke, Jeroen E. and Van Beek, Pieter and Souhaut, Marc and Van der Putten, Nathalie and De Vleeschouwer, François. Recent 210 Pb, 137 Cs and 241 Am accumulation in an ombrotrophic peatland from Amsterdam Island (Southern Indian Ocean). (2017) Journal of Environmental Radioactivity, 175-176. 164-169. ISSN 0265-931X info:eu-repo/semantics/openAccess Ecologie Environnement Peatland Artificial radionuclides Article PeerReviewed info:eu-repo/semantics/article 2017 ftunivtoulouseoa https://doi.org/10.1016/j.jenvrad.2017.05.004 2022-01-11T23:29:05Z 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 OATAO (Open Archive Toulouse Archive Ouverte - Université de Toulouse) Argentina Indian Journal of Environmental Radioactivity 175-176 164 169 |
institution |
Open Polar |
collection |
OATAO (Open Archive Toulouse Archive Ouverte - Université de Toulouse) |
op_collection_id |
ftunivtoulouseoa |
language |
English |
topic |
Ecologie Environnement Peatland Artificial radionuclides |
spellingShingle |
Ecologie Environnement Peatland Artificial radionuclides Li, Chuxian Le Roux, Gaël Sonke, Jeroen E. Van Beek, Pieter Souhaut, Marc Van der Putten, Nathalie De Vleeschouwer, François Recent 210 Pb, 137 Cs and 241 Am accumulation in an ombrotrophic peatland from Amsterdam Island (Southern Indian Ocean) |
topic_facet |
Ecologie Environnement Peatland Artificial radionuclides |
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. |
author2 |
Centre National d'Études Spatiales - CNES (FRANCE) Centre National de la Recherche Scientifique - CNRS (FRANCE) Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE) Institut de Recherche pour le Développement - IRD (FRANCE) Université Toulouse III - Paul Sabatier - UT3 (FRANCE) Lund University (SWEDEN) |
format |
Article in Journal/Newspaper |
author |
Li, Chuxian Le Roux, Gaël Sonke, Jeroen E. Van Beek, Pieter Souhaut, Marc Van der Putten, Nathalie De Vleeschouwer, François |
author_facet |
Li, Chuxian Le Roux, Gaël Sonke, Jeroen E. Van Beek, Pieter Souhaut, Marc Van der Putten, Nathalie De Vleeschouwer, François |
author_sort |
Li, Chuxian |
title |
Recent 210 Pb, 137 Cs and 241 Am accumulation in an ombrotrophic peatland from Amsterdam Island (Southern Indian Ocean) |
title_short |
Recent 210 Pb, 137 Cs and 241 Am accumulation in an ombrotrophic peatland from Amsterdam Island (Southern Indian Ocean) |
title_full |
Recent 210 Pb, 137 Cs and 241 Am accumulation in an ombrotrophic peatland from Amsterdam Island (Southern Indian Ocean) |
title_fullStr |
Recent 210 Pb, 137 Cs and 241 Am accumulation in an ombrotrophic peatland from Amsterdam Island (Southern Indian Ocean) |
title_full_unstemmed |
Recent 210 Pb, 137 Cs and 241 Am accumulation in an ombrotrophic peatland from Amsterdam Island (Southern Indian Ocean) |
title_sort |
recent 210 pb, 137 cs and 241 am accumulation in an ombrotrophic peatland from amsterdam island (southern indian ocean) |
publisher |
Elsevier |
publishDate |
2017 |
url |
https://oatao.univ-toulouse.fr/20952/ https://oatao.univ-toulouse.fr/20952/7/Li_20952.pdf https://doi.org/10.1016/j.jenvrad.2017.05.004 |
geographic |
Argentina Indian |
geographic_facet |
Argentina Indian |
genre |
Amsterdam Island |
genre_facet |
Amsterdam Island |
op_relation |
https://oatao.univ-toulouse.fr/20952/7/Li_20952.pdf HAL : hal-03512169 Li, Chuxian and Le Roux, Gaël and Sonke, Jeroen E. and Van Beek, Pieter and Souhaut, Marc and Van der Putten, Nathalie and De Vleeschouwer, François. Recent 210 Pb, 137 Cs and 241 Am accumulation in an ombrotrophic peatland from Amsterdam Island (Southern Indian Ocean). (2017) Journal of Environmental Radioactivity, 175-176. 164-169. ISSN 0265-931X |
op_rights |
info:eu-repo/semantics/openAccess |
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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1766364991705841664 |