LGM-Holocene changes and Holocene millennial-scale oscillations of dust particles in the EPICA Dome C ice core, East Antarctica
Measurements of the concentration and size distribution of dust particles found in the EPICA (European Project for Ice Coring in Antarctica) Dome C ice core, East Antarctica, provide records covering the last 27 000 years. The total concentration decreased drastically by a factor of 55 from the Last...
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International Glaciology Society
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Online Access: | http://hdl.handle.net/10281/17846 https://doi.org/10.3189/172756402781816843 |
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ftunivmilanobic:oai:boa.unimib.it:10281/17846 2024-04-14T08:01:47+00:00 LGM-Holocene changes and Holocene millennial-scale oscillations of dust particles in the EPICA Dome C ice core, East Antarctica DELMONTE, BARBARA MAGGI, VALTER Petit, J Delmonte, B Petit, J Maggi, V 2002 http://hdl.handle.net/10281/17846 https://doi.org/10.3189/172756402781816843 eng eng International Glaciology Society info:eu-repo/semantics/altIdentifier/wos/WOS:000182023600050 volume:35 issue:1 firstpage:306 lastpage:312 journal:ANNALS OF GLACIOLOGY http://hdl.handle.net/10281/17846 doi:10.3189/172756402781816843 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-0036965629 Antarctica Dome C ice cores microparticles palaeoclimatology info:eu-repo/semantics/article 2002 ftunivmilanobic https://doi.org/10.3189/172756402781816843 2024-03-21T16:31:54Z Measurements of the concentration and size distribution of dust particles found in the EPICA (European Project for Ice Coring in Antarctica) Dome C ice core, East Antarctica, provide records covering the last 27 000 years. The total concentration decreased drastically by a factor of 55 from the Last Glacial Maximum (LGM) (800 ppb) to the Holocene (15 ppb), with a well-marked absolute minimum around 11 500-11 600 years ago. This latter almost corresponds to the end of the Younger Dryas in Greenland, which was marked by a methane peak related to the expansion of tropical wetlands. Assuming that the source region for Antarctic dust is the southern part of South America, the Antarctic dust minimum suggests a larger geographical extent for this wet period. The volume (mass) -size distribution of the particles displays a mode which is close to 2 μm in diameter, shifting from 1.9 μm in the glacial period to 2.07 μm in the Holocene. As opposed to previous results from old Dome C, EPICA suggests a greater proportion of large particles in Holocene samples than in LGM samples. In addition, for the period 13 000-2000 BP, structured millennial-scale oscillations of the dust mode appear. These are especially well marked before 5000 years ago, with higher frequencies also present. The difference between LGM and Holocene particle distributions may be related to changes in the pattern of dust transport to East Antarctica. At Dome C the greater proportion of coarse particles observed during the Holocene suggests greater direct meridional transport. During the LGM, atmospheric circulation was likely more zonal, causing a greater amount of large dust particles to be removed from the atmosphere before reaching Antarctica. Changes in atmospheric circulation could also be the cause of the millennial-scale dust-mode oscillations during the Holocene. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica EPICA Greenland ice core Università degli Studi di Milano-Bicocca: BOA (Bicocca Open Archive) Antarctic East Antarctica Greenland The Antarctic Annals of Glaciology 35 306 312 |
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 cores microparticles palaeoclimatology |
spellingShingle |
Antarctica Dome C ice cores microparticles palaeoclimatology DELMONTE, BARBARA MAGGI, VALTER Petit, J LGM-Holocene changes and Holocene millennial-scale oscillations of dust particles in the EPICA Dome C ice core, East Antarctica |
topic_facet |
Antarctica Dome C ice cores microparticles palaeoclimatology |
description |
Measurements of the concentration and size distribution of dust particles found in the EPICA (European Project for Ice Coring in Antarctica) Dome C ice core, East Antarctica, provide records covering the last 27 000 years. The total concentration decreased drastically by a factor of 55 from the Last Glacial Maximum (LGM) (800 ppb) to the Holocene (15 ppb), with a well-marked absolute minimum around 11 500-11 600 years ago. This latter almost corresponds to the end of the Younger Dryas in Greenland, which was marked by a methane peak related to the expansion of tropical wetlands. Assuming that the source region for Antarctic dust is the southern part of South America, the Antarctic dust minimum suggests a larger geographical extent for this wet period. The volume (mass) -size distribution of the particles displays a mode which is close to 2 μm in diameter, shifting from 1.9 μm in the glacial period to 2.07 μm in the Holocene. As opposed to previous results from old Dome C, EPICA suggests a greater proportion of large particles in Holocene samples than in LGM samples. In addition, for the period 13 000-2000 BP, structured millennial-scale oscillations of the dust mode appear. These are especially well marked before 5000 years ago, with higher frequencies also present. The difference between LGM and Holocene particle distributions may be related to changes in the pattern of dust transport to East Antarctica. At Dome C the greater proportion of coarse particles observed during the Holocene suggests greater direct meridional transport. During the LGM, atmospheric circulation was likely more zonal, causing a greater amount of large dust particles to be removed from the atmosphere before reaching Antarctica. Changes in atmospheric circulation could also be the cause of the millennial-scale dust-mode oscillations during the Holocene. |
author2 |
Delmonte, B Petit, J Maggi, V |
format |
Article in Journal/Newspaper |
author |
DELMONTE, BARBARA MAGGI, VALTER Petit, J |
author_facet |
DELMONTE, BARBARA MAGGI, VALTER Petit, J |
author_sort |
DELMONTE, BARBARA |
title |
LGM-Holocene changes and Holocene millennial-scale oscillations of dust particles in the EPICA Dome C ice core, East Antarctica |
title_short |
LGM-Holocene changes and Holocene millennial-scale oscillations of dust particles in the EPICA Dome C ice core, East Antarctica |
title_full |
LGM-Holocene changes and Holocene millennial-scale oscillations of dust particles in the EPICA Dome C ice core, East Antarctica |
title_fullStr |
LGM-Holocene changes and Holocene millennial-scale oscillations of dust particles in the EPICA Dome C ice core, East Antarctica |
title_full_unstemmed |
LGM-Holocene changes and Holocene millennial-scale oscillations of dust particles in the EPICA Dome C ice core, East Antarctica |
title_sort |
lgm-holocene changes and holocene millennial-scale oscillations of dust particles in the epica dome c ice core, east antarctica |
publisher |
International Glaciology Society |
publishDate |
2002 |
url |
http://hdl.handle.net/10281/17846 https://doi.org/10.3189/172756402781816843 |
geographic |
Antarctic East Antarctica Greenland The Antarctic |
geographic_facet |
Antarctic East Antarctica Greenland The Antarctic |
genre |
Antarc* Antarctic Antarctica East Antarctica EPICA Greenland ice core |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica EPICA Greenland ice core |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000182023600050 volume:35 issue:1 firstpage:306 lastpage:312 journal:ANNALS OF GLACIOLOGY http://hdl.handle.net/10281/17846 doi:10.3189/172756402781816843 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-0036965629 |
op_doi |
https://doi.org/10.3189/172756402781816843 |
container_title |
Annals of Glaciology |
container_volume |
35 |
container_start_page |
306 |
op_container_end_page |
312 |
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1796310825514827776 |