(Appendix A) Geochemical composition of snow and eolian mineral dust from Berkner Island ice sheet, Antarctica
The Sr and Nd isotopic composition of dust extracted from recent snow layers at the top of Berkner Island ice sheet (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 Antarcti...
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Language: | English |
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PANGAEA
2010
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Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.786617 https://doi.org/10.1594/PANGAEA.786617 |
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.786617 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
BER01S03 Berkner Island (Thyssenhöhe) Calcium Depth bottom/max ice/snow top/min Dust concentration International Polar Year (2007-2008) Ion chromatography ipy Neodymium Neodymium-143/Neodymium-144 ratio error Sample ID Sample mass Sample type SNOWPIT Snow pit Sodium Strontium-87/Strontium-86 ratio Thermal Ionization Mass Spectrometry (TIMS) Thyssenhoehe Time coverage δ18O water ε-Neodymium standard deviation ε-Neodymium (0) |
spellingShingle |
BER01S03 Berkner Island (Thyssenhöhe) Calcium Depth bottom/max ice/snow top/min Dust concentration International Polar Year (2007-2008) Ion chromatography ipy Neodymium Neodymium-143/Neodymium-144 ratio error Sample ID Sample mass Sample type SNOWPIT Snow pit Sodium Strontium-87/Strontium-86 ratio Thermal Ionization Mass Spectrometry (TIMS) Thyssenhoehe Time coverage δ18O water ε-Neodymium standard deviation ε-Neodymium (0) Bory, Aloys J-M Wolff, Eric William Mulvaney, Robert Jagoutz, Emil Wegner, Anna Ruth, Urs Elderfield, Henry (Appendix A) Geochemical composition of snow and eolian mineral dust from Berkner Island ice sheet, Antarctica |
topic_facet |
BER01S03 Berkner Island (Thyssenhöhe) Calcium Depth bottom/max ice/snow top/min Dust concentration International Polar Year (2007-2008) Ion chromatography ipy Neodymium Neodymium-143/Neodymium-144 ratio error Sample ID Sample mass Sample type SNOWPIT Snow pit Sodium Strontium-87/Strontium-86 ratio Thermal Ionization Mass Spectrometry (TIMS) Thyssenhoehe Time coverage δ18O water ε-Neodymium standard deviation ε-Neodymium (0) |
description |
The Sr and Nd isotopic composition of dust extracted from recent snow layers at the top of Berkner Island ice sheet (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. Berkner dust 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 Berkner dust 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 multiple sources 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 ... |
format |
Dataset |
author |
Bory, Aloys J-M Wolff, Eric William Mulvaney, Robert Jagoutz, Emil Wegner, Anna Ruth, Urs Elderfield, Henry |
author_facet |
Bory, Aloys J-M Wolff, Eric William Mulvaney, Robert Jagoutz, Emil Wegner, Anna Ruth, Urs Elderfield, Henry |
author_sort |
Bory, Aloys J-M |
title |
(Appendix A) Geochemical composition of snow and eolian mineral dust from Berkner Island ice sheet, Antarctica |
title_short |
(Appendix A) Geochemical composition of snow and eolian mineral dust from Berkner Island ice sheet, Antarctica |
title_full |
(Appendix A) Geochemical composition of snow and eolian mineral dust from Berkner Island ice sheet, Antarctica |
title_fullStr |
(Appendix A) Geochemical composition of snow and eolian mineral dust from Berkner Island ice sheet, Antarctica |
title_full_unstemmed |
(Appendix A) Geochemical composition of snow and eolian mineral dust from Berkner Island ice sheet, Antarctica |
title_sort |
(appendix a) geochemical composition of snow and eolian mineral dust from berkner island ice sheet, antarctica |
publisher |
PANGAEA |
publishDate |
2010 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.786617 https://doi.org/10.1594/PANGAEA.786617 |
op_coverage |
LATITUDE: -79.566700 * LONGITUDE: -45.650000 * DATE/TIME START: 2003-12-01T00:00:00 * DATE/TIME END: 2003-12-01T00:00:00 * MINIMUM DEPTH, ice/snow: 0.0000 m * MAXIMUM DEPTH, ice/snow: 0.9500 m |
long_lat |
ENVELOPE(-45.650000,-45.650000,-79.566700,-79.566700) |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Berkner Island East Antarctica Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Sheet Ice Shelf International Polar Year IPY 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 International Polar Year IPY Ronne Ice Shelf Weddell Sea |
op_source |
Supplement to: Bory, Aloys J-M; Wolff, Eric William; Mulvaney, Robert; Jagoutz, Emil; Wegner, Anna; Ruth, Urs; Elderfield, Henry (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), 138-148, https://doi.org/10.1016/j.epsl.2010.01.006 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.786617 https://doi.org/10.1594/PANGAEA.786617 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.78661710.1016/j.epsl.2010.01.006 |
_version_ |
1810484700477652992 |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.786617 2024-09-15T17:40:06+00:00 (Appendix A) Geochemical composition of snow and eolian mineral dust from Berkner Island ice sheet, Antarctica Bory, Aloys J-M Wolff, Eric William Mulvaney, Robert Jagoutz, Emil Wegner, Anna Ruth, Urs Elderfield, Henry LATITUDE: -79.566700 * LONGITUDE: -45.650000 * DATE/TIME START: 2003-12-01T00:00:00 * DATE/TIME END: 2003-12-01T00:00:00 * MINIMUM DEPTH, ice/snow: 0.0000 m * MAXIMUM DEPTH, ice/snow: 0.9500 m 2010 text/tab-separated-values, 250 data points https://doi.pangaea.de/10.1594/PANGAEA.786617 https://doi.org/10.1594/PANGAEA.786617 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.786617 https://doi.org/10.1594/PANGAEA.786617 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Bory, Aloys J-M; Wolff, Eric William; Mulvaney, Robert; Jagoutz, Emil; Wegner, Anna; Ruth, Urs; Elderfield, Henry (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), 138-148, https://doi.org/10.1016/j.epsl.2010.01.006 BER01S03 Berkner Island (Thyssenhöhe) Calcium Depth bottom/max ice/snow top/min Dust concentration International Polar Year (2007-2008) Ion chromatography ipy Neodymium Neodymium-143/Neodymium-144 ratio error Sample ID Sample mass Sample type SNOWPIT Snow pit Sodium Strontium-87/Strontium-86 ratio Thermal Ionization Mass Spectrometry (TIMS) Thyssenhoehe Time coverage δ18O water ε-Neodymium standard deviation ε-Neodymium (0) dataset 2010 ftpangaea https://doi.org/10.1594/PANGAEA.78661710.1016/j.epsl.2010.01.006 2024-07-24T02:31:31Z The Sr and Nd isotopic composition of dust extracted from recent snow layers at the top of Berkner Island ice sheet (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. Berkner dust 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 Berkner dust 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 multiple sources 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 ... Dataset Antarc* Antarctic Antarctic Peninsula Antarctica Berkner Island East Antarctica Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Sheet Ice Shelf International Polar Year IPY Ronne Ice Shelf Weddell Sea PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-45.650000,-45.650000,-79.566700,-79.566700) |