Dust size evidence for opposite regional atmospheric circulation changes over east Antarctica during the last climatic transition
Three east Antarctic ice cores (Dome B, EPICA-Dome C and Komsomolskaia) give evidence for a uniform dust input to the polar plateau during the last glacial maximum (LGM)/Holocene transition (20 to 10 kyr BP) and the Sr-87/Sr-86 versus Nd-143/Nd-144 isotopic signature of the mineral particles highlig...
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Online Access: | http://hdl.handle.net/10281/417 https://doi.org/10.1007/s00382-004-0450-9 |
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ftunivmilanobic:oai:boa.unimib.it:10281/417 2024-04-14T08:04:11+00:00 Dust size evidence for opposite regional atmospheric circulation changes over east Antarctica during the last climatic transition DELMONTE, BARBARA Petit, JR Andersen, KK Basile Doelseh, I Lipenkov, VY MAGGI, VALTER Delmonte, B Petit, J Andersen, K Basile Doelseh, I Maggi, V Lipenkov, V 2004-09 http://hdl.handle.net/10281/417 https://doi.org/10.1007/s00382-004-0450-9 eng eng SPRINGER place:NEW YORK info:eu-repo/semantics/altIdentifier/wos/WOS:000224274500012 volume:23 issue:3-4 firstpage:427 lastpage:438 journal:CLIMATE DYNAMICS http://hdl.handle.net/10281/417 doi:10.1007/s00382-004-0450-9 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-5044223791 ice core info:eu-repo/semantics/article 2004 ftunivmilanobic https://doi.org/10.1007/s00382-004-0450-9 2024-03-21T16:23:11Z Three east Antarctic ice cores (Dome B, EPICA-Dome C and Komsomolskaia) give evidence for a uniform dust input to the polar plateau during the last glacial maximum (LGM)/Holocene transition (20 to 10 kyr BP) and the Sr-87/Sr-86 versus Nd-143/Nd-144 isotopic signature of the mineral particles highlights a common provenance from southern South America at that time. However, the size distribution of dust from the three ice cores highlights important differences within the east Antarctic during the LGM and shows clearly opposite regional trends during the climatic transition. Between Dome B and Dome C the timing of these changes is also different. A geographical diversity also arises from the different phasing of the short-term (multi-secular scale) dust size oscillations that are superposed at all sites on the main trends of glacial to interglacial changes. We hypothesize the dust grading is controlled by size fractionation inresponse to its atmospheric pathway, either in terms of horizontal trajectory or in altitude of transport. Such mechanism is supported also by the dust size changes observed during a volcanic event recorded in Vostok ice. Ice core dust size data suggest preferential upper air subsidence over the EDG-KMS region and easier penetration of relatively lower air masses to the DB area during the LGM. At the end of the last glacial period and during the climatic transition the region of relatively higher subsidence progressively moved southward. The scenario proposed, supported also by the LGM/Holocene regional changes of snow accumulation, likely operates even at sub-millennial time scale. 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 Polar Plateau ENVELOPE(0.000,0.000,-90.000,-90.000) Climate Dynamics 23 3-4 427 438 |
institution |
Open Polar |
collection |
Università degli Studi di Milano-Bicocca: BOA (Bicocca Open Archive) |
op_collection_id |
ftunivmilanobic |
language |
English |
topic |
ice core |
spellingShingle |
ice core DELMONTE, BARBARA Petit, JR Andersen, KK Basile Doelseh, I Lipenkov, VY MAGGI, VALTER Dust size evidence for opposite regional atmospheric circulation changes over east Antarctica during the last climatic transition |
topic_facet |
ice core |
description |
Three east Antarctic ice cores (Dome B, EPICA-Dome C and Komsomolskaia) give evidence for a uniform dust input to the polar plateau during the last glacial maximum (LGM)/Holocene transition (20 to 10 kyr BP) and the Sr-87/Sr-86 versus Nd-143/Nd-144 isotopic signature of the mineral particles highlights a common provenance from southern South America at that time. However, the size distribution of dust from the three ice cores highlights important differences within the east Antarctic during the LGM and shows clearly opposite regional trends during the climatic transition. Between Dome B and Dome C the timing of these changes is also different. A geographical diversity also arises from the different phasing of the short-term (multi-secular scale) dust size oscillations that are superposed at all sites on the main trends of glacial to interglacial changes. We hypothesize the dust grading is controlled by size fractionation inresponse to its atmospheric pathway, either in terms of horizontal trajectory or in altitude of transport. Such mechanism is supported also by the dust size changes observed during a volcanic event recorded in Vostok ice. Ice core dust size data suggest preferential upper air subsidence over the EDG-KMS region and easier penetration of relatively lower air masses to the DB area during the LGM. At the end of the last glacial period and during the climatic transition the region of relatively higher subsidence progressively moved southward. The scenario proposed, supported also by the LGM/Holocene regional changes of snow accumulation, likely operates even at sub-millennial time scale. |
author2 |
Delmonte, B Petit, J Andersen, K Basile Doelseh, I Maggi, V Lipenkov, V |
format |
Article in Journal/Newspaper |
author |
DELMONTE, BARBARA Petit, JR Andersen, KK Basile Doelseh, I Lipenkov, VY MAGGI, VALTER |
author_facet |
DELMONTE, BARBARA Petit, JR Andersen, KK Basile Doelseh, I Lipenkov, VY MAGGI, VALTER |
author_sort |
DELMONTE, BARBARA |
title |
Dust size evidence for opposite regional atmospheric circulation changes over east Antarctica during the last climatic transition |
title_short |
Dust size evidence for opposite regional atmospheric circulation changes over east Antarctica during the last climatic transition |
title_full |
Dust size evidence for opposite regional atmospheric circulation changes over east Antarctica during the last climatic transition |
title_fullStr |
Dust size evidence for opposite regional atmospheric circulation changes over east Antarctica during the last climatic transition |
title_full_unstemmed |
Dust size evidence for opposite regional atmospheric circulation changes over east Antarctica during the last climatic transition |
title_sort |
dust size evidence for opposite regional atmospheric circulation changes over east antarctica during the last climatic transition |
publisher |
SPRINGER |
publishDate |
2004 |
url |
http://hdl.handle.net/10281/417 https://doi.org/10.1007/s00382-004-0450-9 |
long_lat |
ENVELOPE(0.000,0.000,-90.000,-90.000) |
geographic |
Antarctic East Antarctica Polar Plateau |
geographic_facet |
Antarctic East Antarctica Polar Plateau |
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:000224274500012 volume:23 issue:3-4 firstpage:427 lastpage:438 journal:CLIMATE DYNAMICS http://hdl.handle.net/10281/417 doi:10.1007/s00382-004-0450-9 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-5044223791 |
op_doi |
https://doi.org/10.1007/s00382-004-0450-9 |
container_title |
Climate Dynamics |
container_volume |
23 |
container_issue |
3-4 |
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427 |
op_container_end_page |
438 |
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1796300596518584320 |