Aluminium and iron record for the last 28 kyr derived from the Antarctic EDC96 ice core using new CFA methods
AbstractSpectrofluorimetric and spectrophotometric continuous flow analysis (CFA) methods were developed and applied to the determination of aluminium and iron in EPICA Dome C (East Antarctica) ice-core samples (6–585m depth). The methods are able to measure the fraction of Al and Fe which can be de...
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ftopenaccessrep:oai:zenodo.org:121953 2023-10-29T02:31:24+01:00 Aluminium and iron record for the last 28 kyr derived from the Antarctic EDC96 ice core using new CFA methods Lorenzo Magaldi I. Fattori Carlo Barbante Rita Traversi Roberto Udisti O. Largiuni Vania Gaspari 2004-01-01 https://www.openaccessrepository.it/record/121953 https://doi.org/10.3189/172756404781814438 eng eng url:https://www.openaccessrepository.it/communities/itmirror https://www.openaccessrepository.it/record/121953 doi:10.3189/172756404781814438 info:eu-repo/semantics/openAccess EUTOPIA Alliance NEANIAS Atmospheric Research Community Earth-Surface Processes info:eu-repo/semantics/article publication-article 2004 ftopenaccessrep https://doi.org/10.3189/172756404781814438 2023-10-03T22:19:44Z AbstractSpectrofluorimetric and spectrophotometric continuous flow analysis (CFA) methods were developed and applied to the determination of aluminium and iron in EPICA Dome C (East Antarctica) ice-core samples (6–585m depth). The methods are able to measure the fraction of Al and Fe which can be detected once the sample is filtered on a 5.0 μm membrane and acidified to pH 2. Both the methods present high sensitivity (detection limit of 10 ng L–1 for Al and 50 ng L–1 for Fe) and reproducibility (5% at sub-ppb level). The Fe and Al profiles show sharp decreases in concentrations in the last glacial/interglacial transition, reflecting the decreasing dust aerosol load. The two elements show a different pattern during the Antarctic Cold Reversal (ACR) climatic change, with high iron concentrations (similar to the glacial period) and low but increasing Al content during the ACR minimum. In order to interpret the Al and Fe data obtained by CFA, a comparison with Al and Fe composition, as measured by inductively coupled plasma sector field mass spectrometry (ICP-SFMS), was performed for Holocene, ACR and glacial periods. The percentage of CFA-Al with respect to ICP-SFMS-Al in the three periods shows a lower variability than CFA-Fe (3% in the glacial period and 64% in the ACR). This pattern may be explained by the different dominant iron sources in the different climatic periods. During the Last Glacial Maximum, Fe is proposed to arise mainly from insoluble continental dust, while a variety of ocean-recycled Fe, mainly distributed in fine particles and as more soluble species, shows a higher contribution in the ACR and, to a lesser extent, in the Holocene. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica EPICA ice core Istituto Nazionale di Fisica Nucleare (INFN): Open Access Repository Annals of Glaciology 39 300 306 |
institution |
Open Polar |
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Istituto Nazionale di Fisica Nucleare (INFN): Open Access Repository |
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ftopenaccessrep |
language |
English |
topic |
EUTOPIA Alliance NEANIAS Atmospheric Research Community Earth-Surface Processes |
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EUTOPIA Alliance NEANIAS Atmospheric Research Community Earth-Surface Processes Lorenzo Magaldi I. Fattori Carlo Barbante Rita Traversi Roberto Udisti O. Largiuni Vania Gaspari Aluminium and iron record for the last 28 kyr derived from the Antarctic EDC96 ice core using new CFA methods |
topic_facet |
EUTOPIA Alliance NEANIAS Atmospheric Research Community Earth-Surface Processes |
description |
AbstractSpectrofluorimetric and spectrophotometric continuous flow analysis (CFA) methods were developed and applied to the determination of aluminium and iron in EPICA Dome C (East Antarctica) ice-core samples (6–585m depth). The methods are able to measure the fraction of Al and Fe which can be detected once the sample is filtered on a 5.0 μm membrane and acidified to pH 2. Both the methods present high sensitivity (detection limit of 10 ng L–1 for Al and 50 ng L–1 for Fe) and reproducibility (5% at sub-ppb level). The Fe and Al profiles show sharp decreases in concentrations in the last glacial/interglacial transition, reflecting the decreasing dust aerosol load. The two elements show a different pattern during the Antarctic Cold Reversal (ACR) climatic change, with high iron concentrations (similar to the glacial period) and low but increasing Al content during the ACR minimum. In order to interpret the Al and Fe data obtained by CFA, a comparison with Al and Fe composition, as measured by inductively coupled plasma sector field mass spectrometry (ICP-SFMS), was performed for Holocene, ACR and glacial periods. The percentage of CFA-Al with respect to ICP-SFMS-Al in the three periods shows a lower variability than CFA-Fe (3% in the glacial period and 64% in the ACR). This pattern may be explained by the different dominant iron sources in the different climatic periods. During the Last Glacial Maximum, Fe is proposed to arise mainly from insoluble continental dust, while a variety of ocean-recycled Fe, mainly distributed in fine particles and as more soluble species, shows a higher contribution in the ACR and, to a lesser extent, in the Holocene. |
format |
Article in Journal/Newspaper |
author |
Lorenzo Magaldi I. Fattori Carlo Barbante Rita Traversi Roberto Udisti O. Largiuni Vania Gaspari |
author_facet |
Lorenzo Magaldi I. Fattori Carlo Barbante Rita Traversi Roberto Udisti O. Largiuni Vania Gaspari |
author_sort |
Lorenzo Magaldi |
title |
Aluminium and iron record for the last 28 kyr derived from the Antarctic EDC96 ice core using new CFA methods |
title_short |
Aluminium and iron record for the last 28 kyr derived from the Antarctic EDC96 ice core using new CFA methods |
title_full |
Aluminium and iron record for the last 28 kyr derived from the Antarctic EDC96 ice core using new CFA methods |
title_fullStr |
Aluminium and iron record for the last 28 kyr derived from the Antarctic EDC96 ice core using new CFA methods |
title_full_unstemmed |
Aluminium and iron record for the last 28 kyr derived from the Antarctic EDC96 ice core using new CFA methods |
title_sort |
aluminium and iron record for the last 28 kyr derived from the antarctic edc96 ice core using new cfa methods |
publishDate |
2004 |
url |
https://www.openaccessrepository.it/record/121953 https://doi.org/10.3189/172756404781814438 |
genre |
Antarc* Antarctic Antarctica East Antarctica EPICA ice core |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica EPICA ice core |
op_relation |
url:https://www.openaccessrepository.it/communities/itmirror https://www.openaccessrepository.it/record/121953 doi:10.3189/172756404781814438 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.3189/172756404781814438 |
container_title |
Annals of Glaciology |
container_volume |
39 |
container_start_page |
300 |
op_container_end_page |
306 |
_version_ |
1781069801157820416 |