Origins of sulphate in Antarctic dry-valley soils as deduced from anomalous 17 O compositions
The dry valleys of Antarctica are some of the oldest terrestrial surfaces on the Earth. Despite much study of soil weathering and development, ecosystem dynamics and the occurrence of life in these extreme environments, the reasons behind the exceptionally high salt content of the dry-valley soils h...
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ftlouisianastuir:oai:digitalcommons.lsu.edu:geo_pubs-1261 2023-06-11T04:07:14+02:00 Origins of sulphate in Antarctic dry-valley soils as deduced from anomalous 17 O compositions Bao, Hulming Campbell, Douglas A. Bockheim, James G. Thiemens, Mark H. 2000-09-28T07:00:00Z https://digitalcommons.lsu.edu/geo_pubs/262 https://doi.org/10.1038/35035054 unknown LSU Digital Commons https://digitalcommons.lsu.edu/geo_pubs/262 doi:10.1038/35035054 Faculty Publications text 2000 ftlouisianastuir https://doi.org/10.1038/35035054 2023-05-28T18:16:46Z The dry valleys of Antarctica are some of the oldest terrestrial surfaces on the Earth. Despite much study of soil weathering and development, ecosystem dynamics and the occurrence of life in these extreme environments, the reasons behind the exceptionally high salt content of the dry-valley soils have remained uncertain. In particular, the origins of sulphate are still controversial; proposed sources include wind-blown sea salt, chemical weathering, marine incursion, hydrothermal processes and oxidation of biogenic sulphur in the atmosphere. Here we report measurements of δ18O and δ17O values of sulphates from a range of dry-valley soils. These sulphates all have a large positive anomaly of 17O, of up to 3.4‰. This suggests that Antarctic sulphate comes not just from sea salt (which has no anomaly of 17O) but also from the atmospheric oxidation of reduced gaseous sulphur compounds, the only known process that can generate the observed 17O anomaly. This source is more prominent in high inland soils, suggesting that the distributions of sulphate are largely explained by differences in particle size and transport mode which exist between sea-salt aerosols and aerosols formed from biogenic sulphur emission. Text Antarc* Antarctic Antarctica LSU Digital Commons (Louisiana State University) Antarctic Nature 407 6803 499 502 |
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LSU Digital Commons (Louisiana State University) |
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ftlouisianastuir |
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description |
The dry valleys of Antarctica are some of the oldest terrestrial surfaces on the Earth. Despite much study of soil weathering and development, ecosystem dynamics and the occurrence of life in these extreme environments, the reasons behind the exceptionally high salt content of the dry-valley soils have remained uncertain. In particular, the origins of sulphate are still controversial; proposed sources include wind-blown sea salt, chemical weathering, marine incursion, hydrothermal processes and oxidation of biogenic sulphur in the atmosphere. Here we report measurements of δ18O and δ17O values of sulphates from a range of dry-valley soils. These sulphates all have a large positive anomaly of 17O, of up to 3.4‰. This suggests that Antarctic sulphate comes not just from sea salt (which has no anomaly of 17O) but also from the atmospheric oxidation of reduced gaseous sulphur compounds, the only known process that can generate the observed 17O anomaly. This source is more prominent in high inland soils, suggesting that the distributions of sulphate are largely explained by differences in particle size and transport mode which exist between sea-salt aerosols and aerosols formed from biogenic sulphur emission. |
format |
Text |
author |
Bao, Hulming Campbell, Douglas A. Bockheim, James G. Thiemens, Mark H. |
spellingShingle |
Bao, Hulming Campbell, Douglas A. Bockheim, James G. Thiemens, Mark H. Origins of sulphate in Antarctic dry-valley soils as deduced from anomalous 17 O compositions |
author_facet |
Bao, Hulming Campbell, Douglas A. Bockheim, James G. Thiemens, Mark H. |
author_sort |
Bao, Hulming |
title |
Origins of sulphate in Antarctic dry-valley soils as deduced from anomalous 17 O compositions |
title_short |
Origins of sulphate in Antarctic dry-valley soils as deduced from anomalous 17 O compositions |
title_full |
Origins of sulphate in Antarctic dry-valley soils as deduced from anomalous 17 O compositions |
title_fullStr |
Origins of sulphate in Antarctic dry-valley soils as deduced from anomalous 17 O compositions |
title_full_unstemmed |
Origins of sulphate in Antarctic dry-valley soils as deduced from anomalous 17 O compositions |
title_sort |
origins of sulphate in antarctic dry-valley soils as deduced from anomalous 17 o compositions |
publisher |
LSU Digital Commons |
publishDate |
2000 |
url |
https://digitalcommons.lsu.edu/geo_pubs/262 https://doi.org/10.1038/35035054 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_source |
Faculty Publications |
op_relation |
https://digitalcommons.lsu.edu/geo_pubs/262 doi:10.1038/35035054 |
op_doi |
https://doi.org/10.1038/35035054 |
container_title |
Nature |
container_volume |
407 |
container_issue |
6803 |
container_start_page |
499 |
op_container_end_page |
502 |
_version_ |
1768380191637241856 |