Glacial to Holocene implications of the new 27000-year dust record from the EPICA Dome C (East Antarctica) ice core
Insoluble dust concentrations and volume-size distributions have been measured for the new 581 m deep Dome C-EPICA ice core (Antarctica). Over the 27000 years spanned by the record, microparticle measurements from 169 levels, to date, confirm evidence of the drastic decrease in bulk concentration fr...
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ftunivmilanobic:oai:boa.unimib.it:10281/17845 2024-04-14T08:02:48+00:00 Glacial to Holocene implications of the new 27000-year dust record from the EPICA Dome C (East Antarctica) ice core Delmonte, B Petit, J Maggi, V. Delmonte, B Petit, J Maggi, V 2002 http://hdl.handle.net/10281/17845 https://doi.org/10.1007/s00382-001-0193-9 eng eng Springer-International info:eu-repo/semantics/altIdentifier/wos/WOS:000175791000002 volume:18 issue:8 firstpage:647 lastpage:660 numberofpages:14 journal:CLIMATE DYNAMICS http://hdl.handle.net/10281/17845 doi:10.1007/s00382-001-0193-9 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-0036113781 Antarctica Dome C ice core micropaticles palaeoclimatology info:eu-repo/semantics/article 2002 ftunivmilanobic https://doi.org/10.1007/s00382-001-0193-9 2024-03-21T16:31:54Z Insoluble dust concentrations and volume-size distributions have been measured for the new 581 m deep Dome C-EPICA ice core (Antarctica). Over the 27000 years spanned by the record, microparticle measurements from 169 levels, to date, confirm evidence of the drastic decrease in bulk concentration from the Last Glacial Maximum (LGM) to the Holocene (interglacial) by a factor of more than 50 in absolute value and of about 26 in flux. Unique new features revealed by the EPICA profile include a higher dust concentration during the Antarctic Cold Reversal phase (ACR) by a factor of 2 with respect to the Holocene average. This event is followed by a well-marked minimum that appears to be concomitant with the methane peak that marks the end of the Younger Dryas in the Northern Hemisphere. Particle volume-size distributions show a mode close to 2 μm in diameter, with a slight increase from the LGM to the Holocene; the LGM/Holocene concentration ratio appears to be dependent on particle size and for diameters from 2 to 5 μm it changes from 50 to 6. Glacial samples are characterised by well-sorted particles and very uniform distributions, while the interglacial samples display a high degree of variability and dispersion. This suggests that different modes of transport prevailed during the two climatic periods with easier penetration of air masses into Antarctica in the Holocene than during Glacial times. Assuming that southern South America remained the main dust source for East Antarctica over the time period studied, the higher dust content recorded during the ACR which preceded the Younger Dryas period, represents evidence of a change in South America environmental conditions at this time. A wet period and likely mild climate in South America is suggested at circa 11.5-11.7 kyr BP corresponding to the end of the Younger Dryas. The Holocene part of the profile also shows a slight general decrease in concentration, but with increasingly large particles that may reflect gradual changes at the source Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica EPICA ice core Università degli Studi di Milano-Bicocca: BOA (Bicocca Open Archive) Antarctic East Antarctica The Antarctic Climate Dynamics 18 8 647 660 |
institution |
Open Polar |
collection |
Università degli Studi di Milano-Bicocca: BOA (Bicocca Open Archive) |
op_collection_id |
ftunivmilanobic |
language |
English |
topic |
Antarctica Dome C ice core micropaticles palaeoclimatology |
spellingShingle |
Antarctica Dome C ice core micropaticles palaeoclimatology Delmonte, B Petit, J Maggi, V. Glacial to Holocene implications of the new 27000-year dust record from the EPICA Dome C (East Antarctica) ice core |
topic_facet |
Antarctica Dome C ice core micropaticles palaeoclimatology |
description |
Insoluble dust concentrations and volume-size distributions have been measured for the new 581 m deep Dome C-EPICA ice core (Antarctica). Over the 27000 years spanned by the record, microparticle measurements from 169 levels, to date, confirm evidence of the drastic decrease in bulk concentration from the Last Glacial Maximum (LGM) to the Holocene (interglacial) by a factor of more than 50 in absolute value and of about 26 in flux. Unique new features revealed by the EPICA profile include a higher dust concentration during the Antarctic Cold Reversal phase (ACR) by a factor of 2 with respect to the Holocene average. This event is followed by a well-marked minimum that appears to be concomitant with the methane peak that marks the end of the Younger Dryas in the Northern Hemisphere. Particle volume-size distributions show a mode close to 2 μm in diameter, with a slight increase from the LGM to the Holocene; the LGM/Holocene concentration ratio appears to be dependent on particle size and for diameters from 2 to 5 μm it changes from 50 to 6. Glacial samples are characterised by well-sorted particles and very uniform distributions, while the interglacial samples display a high degree of variability and dispersion. This suggests that different modes of transport prevailed during the two climatic periods with easier penetration of air masses into Antarctica in the Holocene than during Glacial times. Assuming that southern South America remained the main dust source for East Antarctica over the time period studied, the higher dust content recorded during the ACR which preceded the Younger Dryas period, represents evidence of a change in South America environmental conditions at this time. A wet period and likely mild climate in South America is suggested at circa 11.5-11.7 kyr BP corresponding to the end of the Younger Dryas. The Holocene part of the profile also shows a slight general decrease in concentration, but with increasingly large particles that may reflect gradual changes at the source |
author2 |
Delmonte, B Petit, J Maggi, V |
format |
Article in Journal/Newspaper |
author |
Delmonte, B Petit, J Maggi, V. |
author_facet |
Delmonte, B Petit, J Maggi, V. |
author_sort |
Delmonte, B |
title |
Glacial to Holocene implications of the new 27000-year dust record from the EPICA Dome C (East Antarctica) ice core |
title_short |
Glacial to Holocene implications of the new 27000-year dust record from the EPICA Dome C (East Antarctica) ice core |
title_full |
Glacial to Holocene implications of the new 27000-year dust record from the EPICA Dome C (East Antarctica) ice core |
title_fullStr |
Glacial to Holocene implications of the new 27000-year dust record from the EPICA Dome C (East Antarctica) ice core |
title_full_unstemmed |
Glacial to Holocene implications of the new 27000-year dust record from the EPICA Dome C (East Antarctica) ice core |
title_sort |
glacial to holocene implications of the new 27000-year dust record from the epica dome c (east antarctica) ice core |
publisher |
Springer-International |
publishDate |
2002 |
url |
http://hdl.handle.net/10281/17845 https://doi.org/10.1007/s00382-001-0193-9 |
geographic |
Antarctic East Antarctica The Antarctic |
geographic_facet |
Antarctic East Antarctica The Antarctic |
genre |
Antarc* Antarctic Antarctica East Antarctica EPICA ice core |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica EPICA ice core |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000175791000002 volume:18 issue:8 firstpage:647 lastpage:660 numberofpages:14 journal:CLIMATE DYNAMICS http://hdl.handle.net/10281/17845 doi:10.1007/s00382-001-0193-9 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-0036113781 |
op_doi |
https://doi.org/10.1007/s00382-001-0193-9 |
container_title |
Climate Dynamics |
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18 |
container_issue |
8 |
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647 |
op_container_end_page |
660 |
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