Natural lead isotope variations in the atmosphere
Stable lead (Pb) isotope data from pre-contamination peat sections has the potential to contribute to our understanding of earth system processes (e.g., atmospheric circulation, erosion, volcanic activity) in the past. Key questions arise however. Can the Pb isotopes archived in peat records be used...
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ftstockholmuniv:oai:DiVA.org:su-47310 2023-05-15T16:39:25+02:00 Natural lead isotope variations in the atmosphere Kylander, Malin Klaminder, Jonatan Bindler, Richard Weiss, Dominik 2010 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-47310 https://doi.org/10.1016/j.epsl.2009.11.055 eng eng Institutionen för geologiska vetenskaper Department of Ecology and Environmental Sciences, Umeå University Department of Earth Science and Engineering, Imperial College London Earth and Planetary Science Letters, 0012-821X, 2010, 290:1-2, s. 44-53 orcid:0000-0001-8787-5069 http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-47310 doi:10.1016/j.epsl.2009.11.055 ISI:000274844700006 info:eu-repo/semantics/openAccess Pb isotopes atmospheric deposition mineral dust volcano aerosol Natural Sciences Naturvetenskap Article in journal info:eu-repo/semantics/article text 2010 ftstockholmuniv https://doi.org/10.1016/j.epsl.2009.11.055 2023-02-23T21:42:18Z Stable lead (Pb) isotope data from pre-contamination peat sections has the potential to contribute to our understanding of earth system processes (e.g., atmospheric circulation, erosion, volcanic activity) in the past. Key questions arise however. Can the Pb isotopes archived in peat records be used for assessing aerosol dynamics on a hemispheric scale or do they mainly reflect inputs from local soils? What natural Pb sources are important and do contributions vary over time? In order to answer these questions we have synthesized all available Pb isotope data from pre-contamination peat sections in Europe, Australia, North America and South America. We specifically examine the spatial and temporal variability of the Pb isotope records and identify regionally important trends and Pb sources. A pooling of all available pre-contamination peat data generated an average natural 206Pb/207Pb background ratio of 1.21±0.05 (2σ, n=300)(206Pb/204Pb= 18.90±0.86, 207Pb/204Pb= 15.66±0.10 and 208Pb/204Pb= 38.74±0.57, n=207). The majority of the records showed limited temporal and compositional agreement, suggesting that the peat record receives mainly inputs from local (<10 km) and/or regional (10-500 km) sources. Three-isotope plots also support local and regional control and evidence a wide natural spread at some sites, particularly those located in radiogenic geological settings. A temporally synchronous isotope excursion to values between 1.16-1.18 at sites across Europe ca 4000-3000 B.C. was detected, however. While usually associated with anthropogenic sources, there are indeed natural aerosols having 206Pb/207Pb signatures as low as 1.16 as evidenced in several peat and ice core records globally. Three-isotope plots suggest that this unlikely to be a signal of mineral dust contributions, which tend to have 206Pb/207Pb ratios ≥1.19, but rather sourced to volcanic emissions. These results stress caution when using estimates of the upper continental crust to constrain natural Pb sources in, e.g., mixing equations. ... Article in Journal/Newspaper ice core Stockholm University: Publications (DiVA) Earth and Planetary Science Letters 290 1-2 44 53 |
institution |
Open Polar |
collection |
Stockholm University: Publications (DiVA) |
op_collection_id |
ftstockholmuniv |
language |
English |
topic |
Pb isotopes atmospheric deposition mineral dust volcano aerosol Natural Sciences Naturvetenskap |
spellingShingle |
Pb isotopes atmospheric deposition mineral dust volcano aerosol Natural Sciences Naturvetenskap Kylander, Malin Klaminder, Jonatan Bindler, Richard Weiss, Dominik Natural lead isotope variations in the atmosphere |
topic_facet |
Pb isotopes atmospheric deposition mineral dust volcano aerosol Natural Sciences Naturvetenskap |
description |
Stable lead (Pb) isotope data from pre-contamination peat sections has the potential to contribute to our understanding of earth system processes (e.g., atmospheric circulation, erosion, volcanic activity) in the past. Key questions arise however. Can the Pb isotopes archived in peat records be used for assessing aerosol dynamics on a hemispheric scale or do they mainly reflect inputs from local soils? What natural Pb sources are important and do contributions vary over time? In order to answer these questions we have synthesized all available Pb isotope data from pre-contamination peat sections in Europe, Australia, North America and South America. We specifically examine the spatial and temporal variability of the Pb isotope records and identify regionally important trends and Pb sources. A pooling of all available pre-contamination peat data generated an average natural 206Pb/207Pb background ratio of 1.21±0.05 (2σ, n=300)(206Pb/204Pb= 18.90±0.86, 207Pb/204Pb= 15.66±0.10 and 208Pb/204Pb= 38.74±0.57, n=207). The majority of the records showed limited temporal and compositional agreement, suggesting that the peat record receives mainly inputs from local (<10 km) and/or regional (10-500 km) sources. Three-isotope plots also support local and regional control and evidence a wide natural spread at some sites, particularly those located in radiogenic geological settings. A temporally synchronous isotope excursion to values between 1.16-1.18 at sites across Europe ca 4000-3000 B.C. was detected, however. While usually associated with anthropogenic sources, there are indeed natural aerosols having 206Pb/207Pb signatures as low as 1.16 as evidenced in several peat and ice core records globally. Three-isotope plots suggest that this unlikely to be a signal of mineral dust contributions, which tend to have 206Pb/207Pb ratios ≥1.19, but rather sourced to volcanic emissions. These results stress caution when using estimates of the upper continental crust to constrain natural Pb sources in, e.g., mixing equations. ... |
format |
Article in Journal/Newspaper |
author |
Kylander, Malin Klaminder, Jonatan Bindler, Richard Weiss, Dominik |
author_facet |
Kylander, Malin Klaminder, Jonatan Bindler, Richard Weiss, Dominik |
author_sort |
Kylander, Malin |
title |
Natural lead isotope variations in the atmosphere |
title_short |
Natural lead isotope variations in the atmosphere |
title_full |
Natural lead isotope variations in the atmosphere |
title_fullStr |
Natural lead isotope variations in the atmosphere |
title_full_unstemmed |
Natural lead isotope variations in the atmosphere |
title_sort |
natural lead isotope variations in the atmosphere |
publisher |
Institutionen för geologiska vetenskaper |
publishDate |
2010 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-47310 https://doi.org/10.1016/j.epsl.2009.11.055 |
genre |
ice core |
genre_facet |
ice core |
op_relation |
Earth and Planetary Science Letters, 0012-821X, 2010, 290:1-2, s. 44-53 orcid:0000-0001-8787-5069 http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-47310 doi:10.1016/j.epsl.2009.11.055 ISI:000274844700006 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.epsl.2009.11.055 |
container_title |
Earth and Planetary Science Letters |
container_volume |
290 |
container_issue |
1-2 |
container_start_page |
44 |
op_container_end_page |
53 |
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1766029757989781504 |