Multiple sources supply eolian mineral dust to the Atlantic sector of coastal Antarctica: Evidence from recent snow layers at the top of Berkner Island ice sheet
The Sr and Nd isotopic composition of dust extracted from recentsnowlayers at the top of BerknerIslandicesheet (located within the Filchner–Ronne Ice Shelf at the southern end of the Weddell Sea) enables us, for the first time, to document dust provenance in Antarctica outside the East Antarctic Pla...
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Online Access: | https://epic.awi.de/id/eprint/21709/ https://hdl.handle.net/10013/epic.37134 |
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ftawi:oai:epic.awi.de:21709 2024-09-15T17:46:38+00:00 Multiple sources supply eolian mineral dust to the Atlantic sector of coastal Antarctica: Evidence from recent snow layers at the top of Berkner Island ice sheet Bory, A. Wolff, E. Mulvaney, R. Jagoutz, E. Wegner, Anna Ruth, Urs Elderfield, H. 2010 https://epic.awi.de/id/eprint/21709/ https://hdl.handle.net/10013/epic.37134 unknown ELSEVIER SCIENCE BV Bory, A. , Wolff, E. , Mulvaney, R. , Jagoutz, E. , Wegner, A. , Ruth, U. and Elderfield, H. (2010) Multiple sources supply eolian mineral dust to the Atlantic sector of coastal Antarctica: Evidence from recent snow layers at the top of Berkner Island ice sheet , Earth and Planetary Science Letters, 291 (1-4), pp. 138-148 . doi:10.1016/j.epsl.2010.01.006 <https://doi.org/10.1016/j.epsl.2010.01.006> , hdl:10013/epic.37134 EPIC3Earth and Planetary Science Letters, ELSEVIER SCIENCE BV, 291(1-4), pp. 138-148, ISSN: 0012-821X Article isiRev 2010 ftawi https://doi.org/10.1016/j.epsl.2010.01.006 2024-06-24T04:01:54Z The Sr and Nd isotopic composition of dust extracted from recentsnowlayers at the top of BerknerIslandicesheet (located within the Filchner–Ronne Ice Shelf at the southern end of the Weddell Sea) enables us, for the first time, to document dust provenance in Antarctica outside the East Antarctic Plateau (EAP) where all previous studies based on isotopic fingerprinting were carried out. Berknerdust displays an overall crust-like isotopic signature, characterized by more radiogenic 87Sr/86Sr and much less radiogenic 143Nd/144Nd compared to dust deposited on the EAP during glacial periods. Differences with EAP interglacial dust are not as marked but still significant, indicating that present-day Berknerdust provenance is distinct, at least to some extent, from that of the dust reaching the EAP. The fourteen snow-pit sub-seasonal samples that were obtained span a two-year period (2002–2003) and their dust Sr and Nd isotopic composition reveals that multiplesources are at play over a yearly time period. Southern South America, Patagonia in particular, likely accounts for part of the observed spring/summer dust deposition maxima, when isotopic composition is shifted towards “younger” isotopic signatures. In the spring, possible additional inputs from Australian sources would also be supported by the data. Most of the year, however, the measured isotopic signatures would be best explained by a sustained background supply from putative local sources in East Antarctica, which carry old-crust-like isotopic fingerprints. Whether the restricted East Antarctic ice-free areas produce sufficient eolian material has yet to be substantiated however. The fact that large (> 5 μm) particles represent a significant fraction of the samples throughout the entire time-series supports scenarios that involve contributions from proximal sources, either in Patagonia and/or Antarctica (possibly including snow-free areas in the Antarctic Peninsula and other areas as well). This also indicates that additional dust transport, which does not ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Berkner Island East Antarctica Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Sheet Ice Shelf Ronne Ice Shelf Weddell Sea Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Earth and Planetary Science Letters 291 1-4 138 148 |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
The Sr and Nd isotopic composition of dust extracted from recentsnowlayers at the top of BerknerIslandicesheet (located within the Filchner–Ronne Ice Shelf at the southern end of the Weddell Sea) enables us, for the first time, to document dust provenance in Antarctica outside the East Antarctic Plateau (EAP) where all previous studies based on isotopic fingerprinting were carried out. Berknerdust displays an overall crust-like isotopic signature, characterized by more radiogenic 87Sr/86Sr and much less radiogenic 143Nd/144Nd compared to dust deposited on the EAP during glacial periods. Differences with EAP interglacial dust are not as marked but still significant, indicating that present-day Berknerdust provenance is distinct, at least to some extent, from that of the dust reaching the EAP. The fourteen snow-pit sub-seasonal samples that were obtained span a two-year period (2002–2003) and their dust Sr and Nd isotopic composition reveals that multiplesources are at play over a yearly time period. Southern South America, Patagonia in particular, likely accounts for part of the observed spring/summer dust deposition maxima, when isotopic composition is shifted towards “younger” isotopic signatures. In the spring, possible additional inputs from Australian sources would also be supported by the data. Most of the year, however, the measured isotopic signatures would be best explained by a sustained background supply from putative local sources in East Antarctica, which carry old-crust-like isotopic fingerprints. Whether the restricted East Antarctic ice-free areas produce sufficient eolian material has yet to be substantiated however. The fact that large (> 5 μm) particles represent a significant fraction of the samples throughout the entire time-series supports scenarios that involve contributions from proximal sources, either in Patagonia and/or Antarctica (possibly including snow-free areas in the Antarctic Peninsula and other areas as well). This also indicates that additional dust transport, which does not ... |
format |
Article in Journal/Newspaper |
author |
Bory, A. Wolff, E. Mulvaney, R. Jagoutz, E. Wegner, Anna Ruth, Urs Elderfield, H. |
spellingShingle |
Bory, A. Wolff, E. Mulvaney, R. Jagoutz, E. Wegner, Anna Ruth, Urs Elderfield, H. Multiple sources supply eolian mineral dust to the Atlantic sector of coastal Antarctica: Evidence from recent snow layers at the top of Berkner Island ice sheet |
author_facet |
Bory, A. Wolff, E. Mulvaney, R. Jagoutz, E. Wegner, Anna Ruth, Urs Elderfield, H. |
author_sort |
Bory, A. |
title |
Multiple sources supply eolian mineral dust to the Atlantic sector of coastal Antarctica: Evidence from recent snow layers at the top of Berkner Island ice sheet |
title_short |
Multiple sources supply eolian mineral dust to the Atlantic sector of coastal Antarctica: Evidence from recent snow layers at the top of Berkner Island ice sheet |
title_full |
Multiple sources supply eolian mineral dust to the Atlantic sector of coastal Antarctica: Evidence from recent snow layers at the top of Berkner Island ice sheet |
title_fullStr |
Multiple sources supply eolian mineral dust to the Atlantic sector of coastal Antarctica: Evidence from recent snow layers at the top of Berkner Island ice sheet |
title_full_unstemmed |
Multiple sources supply eolian mineral dust to the Atlantic sector of coastal Antarctica: Evidence from recent snow layers at the top of Berkner Island ice sheet |
title_sort |
multiple sources supply eolian mineral dust to the atlantic sector of coastal antarctica: evidence from recent snow layers at the top of berkner island ice sheet |
publisher |
ELSEVIER SCIENCE BV |
publishDate |
2010 |
url |
https://epic.awi.de/id/eprint/21709/ https://hdl.handle.net/10013/epic.37134 |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Berkner Island East Antarctica Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Sheet Ice Shelf Ronne Ice Shelf Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Berkner Island East Antarctica Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Sheet Ice Shelf Ronne Ice Shelf Weddell Sea |
op_source |
EPIC3Earth and Planetary Science Letters, ELSEVIER SCIENCE BV, 291(1-4), pp. 138-148, ISSN: 0012-821X |
op_relation |
Bory, A. , Wolff, E. , Mulvaney, R. , Jagoutz, E. , Wegner, A. , Ruth, U. and Elderfield, H. (2010) Multiple sources supply eolian mineral dust to the Atlantic sector of coastal Antarctica: Evidence from recent snow layers at the top of Berkner Island ice sheet , Earth and Planetary Science Letters, 291 (1-4), pp. 138-148 . doi:10.1016/j.epsl.2010.01.006 <https://doi.org/10.1016/j.epsl.2010.01.006> , hdl:10013/epic.37134 |
op_doi |
https://doi.org/10.1016/j.epsl.2010.01.006 |
container_title |
Earth and Planetary Science Letters |
container_volume |
291 |
container_issue |
1-4 |
container_start_page |
138 |
op_container_end_page |
148 |
_version_ |
1810494928196730880 |