A major glacial-interglacial change in aeolian dust composition inferred from Rare Earth Elements in Antarctic ice
We present the first Rare Earth Elements (REE) concentration record determined in 294 sections of an Antarctic ice core (EPICA Dome C), covering a period from 2.9 to 33.7 kyr BP. REE allow a detailed quantitative evaluation of aeolian dust composition because of the large number of variables (i.e. 1...
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ftanucanberra:oai:digitalcollections.anu.edu.au:1885/22062 2023-05-15T13:56:14+02:00 A major glacial-interglacial change in aeolian dust composition inferred from Rare Earth Elements in Antarctic ice Gabrielli, Paulo Wegner, Anna Petit, Jean Robert Delmonte, Barbara De Deckker, Patrick Gaspari, Vania Fischer, Hubertus Ruth, Urs Kriews, Michael Boutron, Claude Cescon, Paolo Barbante, Carlo 2015-12-07T22:27:48Z http://hdl.handle.net/1885/22062 unknown Pergamon-Elsevier Ltd 0277-3791 http://hdl.handle.net/1885/22062 Quaternary Science Reviews Journal article 2015 ftanucanberra 2015-12-28T23:20:06Z We present the first Rare Earth Elements (REE) concentration record determined in 294 sections of an Antarctic ice core (EPICA Dome C), covering a period from 2.9 to 33.7 kyr BP. REE allow a detailed quantitative evaluation of aeolian dust composition because of the large number of variables (i.e. 14 elements). REE concentrations match the particulate dust concentration profile over this period and show a homogeneous crustal-like composition during the last glacial stage (LGS), with only a slight enrichment in medium REE. This signature is consistent with the persistent fallout of a mixture of dust from heterogeneous sources located in different areas or within the same region (e.g. South America). Starting at ∼15 kyr BP, there was a major change in dust composition, the variable character of which persisted throughout the Holocene. This varying signature may highlight the alternation of single dust contributions from different sources during the Holocene. We observe that the frequent changes in REE composition at the onset of the Holocene (10-13.5 kyr BP) are linked to dust size and in turn to wind strength and/or the path of the atmospheric trajectory. This may indicate that atmospheric circulation dictated the composition of the dust fallout to East Antarctica at that time. Although the dust concentrations remained fairly low, a notable return towards more glacial dust characteristics is recorded between 7.5 and 8.3 kyr BP. This happened concomitantly with a widespread cold event around 8 kyr BP that was 400-600 years long and suggests a moderate reactivation of the dust emission from the same potential source areas of the LGS. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica EPICA ice core Australian National University: ANU Digital Collections Antarctic East Antarctica |
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Open Polar |
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Australian National University: ANU Digital Collections |
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ftanucanberra |
language |
unknown |
description |
We present the first Rare Earth Elements (REE) concentration record determined in 294 sections of an Antarctic ice core (EPICA Dome C), covering a period from 2.9 to 33.7 kyr BP. REE allow a detailed quantitative evaluation of aeolian dust composition because of the large number of variables (i.e. 14 elements). REE concentrations match the particulate dust concentration profile over this period and show a homogeneous crustal-like composition during the last glacial stage (LGS), with only a slight enrichment in medium REE. This signature is consistent with the persistent fallout of a mixture of dust from heterogeneous sources located in different areas or within the same region (e.g. South America). Starting at ∼15 kyr BP, there was a major change in dust composition, the variable character of which persisted throughout the Holocene. This varying signature may highlight the alternation of single dust contributions from different sources during the Holocene. We observe that the frequent changes in REE composition at the onset of the Holocene (10-13.5 kyr BP) are linked to dust size and in turn to wind strength and/or the path of the atmospheric trajectory. This may indicate that atmospheric circulation dictated the composition of the dust fallout to East Antarctica at that time. Although the dust concentrations remained fairly low, a notable return towards more glacial dust characteristics is recorded between 7.5 and 8.3 kyr BP. This happened concomitantly with a widespread cold event around 8 kyr BP that was 400-600 years long and suggests a moderate reactivation of the dust emission from the same potential source areas of the LGS. |
format |
Article in Journal/Newspaper |
author |
Gabrielli, Paulo Wegner, Anna Petit, Jean Robert Delmonte, Barbara De Deckker, Patrick Gaspari, Vania Fischer, Hubertus Ruth, Urs Kriews, Michael Boutron, Claude Cescon, Paolo Barbante, Carlo |
spellingShingle |
Gabrielli, Paulo Wegner, Anna Petit, Jean Robert Delmonte, Barbara De Deckker, Patrick Gaspari, Vania Fischer, Hubertus Ruth, Urs Kriews, Michael Boutron, Claude Cescon, Paolo Barbante, Carlo A major glacial-interglacial change in aeolian dust composition inferred from Rare Earth Elements in Antarctic ice |
author_facet |
Gabrielli, Paulo Wegner, Anna Petit, Jean Robert Delmonte, Barbara De Deckker, Patrick Gaspari, Vania Fischer, Hubertus Ruth, Urs Kriews, Michael Boutron, Claude Cescon, Paolo Barbante, Carlo |
author_sort |
Gabrielli, Paulo |
title |
A major glacial-interglacial change in aeolian dust composition inferred from Rare Earth Elements in Antarctic ice |
title_short |
A major glacial-interglacial change in aeolian dust composition inferred from Rare Earth Elements in Antarctic ice |
title_full |
A major glacial-interglacial change in aeolian dust composition inferred from Rare Earth Elements in Antarctic ice |
title_fullStr |
A major glacial-interglacial change in aeolian dust composition inferred from Rare Earth Elements in Antarctic ice |
title_full_unstemmed |
A major glacial-interglacial change in aeolian dust composition inferred from Rare Earth Elements in Antarctic ice |
title_sort |
major glacial-interglacial change in aeolian dust composition inferred from rare earth elements in antarctic ice |
publisher |
Pergamon-Elsevier Ltd |
publishDate |
2015 |
url |
http://hdl.handle.net/1885/22062 |
geographic |
Antarctic East Antarctica |
geographic_facet |
Antarctic East Antarctica |
genre |
Antarc* Antarctic Antarctica East Antarctica EPICA ice core |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica EPICA ice core |
op_source |
Quaternary Science Reviews |
op_relation |
0277-3791 http://hdl.handle.net/1885/22062 |
_version_ |
1766263607221288960 |