Insight Into Provenance and Variability of Atmospheric Dust in Antarctic Ice Cores During the Late Pleistocene From Magnetic Measurements
We measured saturation isothermal remanent magnetization (SIRM), coercivity of remanence (H-cr), and insoluble dust mass concentration (IDC) of 49 ice samples from Vostok and EPICA Dome-C ice cores (Antarctica) as a measure of magnetic properties of the aerosol dust trapped in the ice. Samples range...
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Online Access: | http://hdl.handle.net/10281/278332 https://doi.org/10.3389/feart.2020.00258 |
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ftunivmilanobic:oai:boa.unimib.it:10281/278332 2024-04-21T07:46:25+00:00 Insight Into Provenance and Variability of Atmospheric Dust in Antarctic Ice Cores During the Late Pleistocene From Magnetic Measurements Lanci, Luca Delmonte, Barbara Salvatore, Maria Cristina Baroni, Carlo Lanci, L Delmonte, B Salvatore, M Baroni, C 2020 http://hdl.handle.net/10281/278332 https://doi.org/10.3389/feart.2020.00258 eng eng Frontiers Research Foundation country:CH info:eu-repo/semantics/altIdentifier/wos/WOS:000552785000001 volume:8 journal:FRONTIERS IN EARTH SCIENCE http://hdl.handle.net/10281/278332 doi:10.3389/feart.2020.00258 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85087915903 Antarctic ice core Atmospheric dust concentration dust source area isothermal remanent magnetization magnetic propertie info:eu-repo/semantics/article 2020 ftunivmilanobic https://doi.org/10.3389/feart.2020.00258 2024-03-28T01:16:08Z We measured saturation isothermal remanent magnetization (SIRM), coercivity of remanence (H-cr), and insoluble dust mass concentration (IDC) of 49 ice samples from Vostok and EPICA Dome-C ice cores (Antarctica) as a measure of magnetic properties of the aerosol dust trapped in the ice. Samples range in age from marine isotopic stage (MIS) 7 to 19 in EPICA Dome-C ice core and from MIS 1 to 11 in Vostok ice core. Data from ice samples were compared with 86 samples from possible source areas (PSA) from East Antarctica, including 11 samples from South America and New Zealand. Previous results from MIS 1 to MIS 6 found that magnetic properties of aerosol dust could be divided in two distinct groups characterized by high-H(cr)and low-SIRM(dust)for glacial samples, and low-H(cr)and high-SIRMdust, for interglacial samples. The new data from older ice samples highlighted several discrepancies from this expectation with significant differences between Vostok and Dome-C sites. Magnetic properties of Antarctic PSA sample show a large variability, however, PSA samples from Victoria Land and few other, have magnetic properties compatible with that of the glacial dust, or more precisely with samples characterized by high dust flux. The new data from Pleistocene ice and from PSA samples confirm South American and Antarctic provenance of the largest atmospheric dust load typical of glacial stages. On the other hand, we did not found any PSA sample with properties compatible with the highly magnetic samples (mostly from interglacial stages), which are characterized by low IDC. These samples from the oldest and deepest part of the cores revealed a more complex picture than previously outlined from the analysis of MIS 1-6, and show unusual magnetic properties which can be tentatively attributed to post-depositional alteration occurring into the ice. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica EPICA ice core Victoria Land Università degli Studi di Milano-Bicocca: BOA (Bicocca Open Archive) Frontiers in Earth Science 8 |
institution |
Open Polar |
collection |
Università degli Studi di Milano-Bicocca: BOA (Bicocca Open Archive) |
op_collection_id |
ftunivmilanobic |
language |
English |
topic |
Antarctic ice core Atmospheric dust concentration dust source area isothermal remanent magnetization magnetic propertie |
spellingShingle |
Antarctic ice core Atmospheric dust concentration dust source area isothermal remanent magnetization magnetic propertie Lanci, Luca Delmonte, Barbara Salvatore, Maria Cristina Baroni, Carlo Insight Into Provenance and Variability of Atmospheric Dust in Antarctic Ice Cores During the Late Pleistocene From Magnetic Measurements |
topic_facet |
Antarctic ice core Atmospheric dust concentration dust source area isothermal remanent magnetization magnetic propertie |
description |
We measured saturation isothermal remanent magnetization (SIRM), coercivity of remanence (H-cr), and insoluble dust mass concentration (IDC) of 49 ice samples from Vostok and EPICA Dome-C ice cores (Antarctica) as a measure of magnetic properties of the aerosol dust trapped in the ice. Samples range in age from marine isotopic stage (MIS) 7 to 19 in EPICA Dome-C ice core and from MIS 1 to 11 in Vostok ice core. Data from ice samples were compared with 86 samples from possible source areas (PSA) from East Antarctica, including 11 samples from South America and New Zealand. Previous results from MIS 1 to MIS 6 found that magnetic properties of aerosol dust could be divided in two distinct groups characterized by high-H(cr)and low-SIRM(dust)for glacial samples, and low-H(cr)and high-SIRMdust, for interglacial samples. The new data from older ice samples highlighted several discrepancies from this expectation with significant differences between Vostok and Dome-C sites. Magnetic properties of Antarctic PSA sample show a large variability, however, PSA samples from Victoria Land and few other, have magnetic properties compatible with that of the glacial dust, or more precisely with samples characterized by high dust flux. The new data from Pleistocene ice and from PSA samples confirm South American and Antarctic provenance of the largest atmospheric dust load typical of glacial stages. On the other hand, we did not found any PSA sample with properties compatible with the highly magnetic samples (mostly from interglacial stages), which are characterized by low IDC. These samples from the oldest and deepest part of the cores revealed a more complex picture than previously outlined from the analysis of MIS 1-6, and show unusual magnetic properties which can be tentatively attributed to post-depositional alteration occurring into the ice. |
author2 |
Lanci, L Delmonte, B Salvatore, M Baroni, C |
format |
Article in Journal/Newspaper |
author |
Lanci, Luca Delmonte, Barbara Salvatore, Maria Cristina Baroni, Carlo |
author_facet |
Lanci, Luca Delmonte, Barbara Salvatore, Maria Cristina Baroni, Carlo |
author_sort |
Lanci, Luca |
title |
Insight Into Provenance and Variability of Atmospheric Dust in Antarctic Ice Cores During the Late Pleistocene From Magnetic Measurements |
title_short |
Insight Into Provenance and Variability of Atmospheric Dust in Antarctic Ice Cores During the Late Pleistocene From Magnetic Measurements |
title_full |
Insight Into Provenance and Variability of Atmospheric Dust in Antarctic Ice Cores During the Late Pleistocene From Magnetic Measurements |
title_fullStr |
Insight Into Provenance and Variability of Atmospheric Dust in Antarctic Ice Cores During the Late Pleistocene From Magnetic Measurements |
title_full_unstemmed |
Insight Into Provenance and Variability of Atmospheric Dust in Antarctic Ice Cores During the Late Pleistocene From Magnetic Measurements |
title_sort |
insight into provenance and variability of atmospheric dust in antarctic ice cores during the late pleistocene from magnetic measurements |
publisher |
Frontiers Research Foundation |
publishDate |
2020 |
url |
http://hdl.handle.net/10281/278332 https://doi.org/10.3389/feart.2020.00258 |
genre |
Antarc* Antarctic Antarctica East Antarctica EPICA ice core Victoria Land |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica EPICA ice core Victoria Land |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000552785000001 volume:8 journal:FRONTIERS IN EARTH SCIENCE http://hdl.handle.net/10281/278332 doi:10.3389/feart.2020.00258 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85087915903 |
op_doi |
https://doi.org/10.3389/feart.2020.00258 |
container_title |
Frontiers in Earth Science |
container_volume |
8 |
_version_ |
1796943472689676288 |