Quaternary variations and origin of continental dust in East antarctica
The mineral dust of continental origin windblown to the East Antarctic Plateau has been studied for its geographical provenance and variability during the Quaternary. Four deep ice cores [EPICA-Dome C (75° 06'S, 123° 21'E), Dome B (77° 05' S, 94° 55' E), Vostok (78° S, 106° E) an...
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Other Authors: | , , , , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
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HAL CCSD
2003
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Online Access: | https://theses.hal.science/tel-00701343 https://theses.hal.science/tel-00701343/document https://theses.hal.science/tel-00701343/file/These-Delmonte-2003.pdf |
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ftunigrenoble:oai:HAL:tel-00701343v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Université Grenoble Alpes: HAL |
op_collection_id |
ftunigrenoble |
language |
English |
topic |
aérosols minéraux continentaux carootte glaciaire Dome B Vostok Komsomolskaia signature isotopique interglaciaires Holocène propagation circumpolaire [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDV.EE.BIO]Life Sciences [q-bio]/Ecology environment/Bioclimatology |
spellingShingle |
aérosols minéraux continentaux carootte glaciaire Dome B Vostok Komsomolskaia signature isotopique interglaciaires Holocène propagation circumpolaire [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDV.EE.BIO]Life Sciences [q-bio]/Ecology environment/Bioclimatology Delmonte, Barbara Quaternary variations and origin of continental dust in East antarctica |
topic_facet |
aérosols minéraux continentaux carootte glaciaire Dome B Vostok Komsomolskaia signature isotopique interglaciaires Holocène propagation circumpolaire [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDV.EE.BIO]Life Sciences [q-bio]/Ecology environment/Bioclimatology |
description |
The mineral dust of continental origin windblown to the East Antarctic Plateau has been studied for its geographical provenance and variability during the Quaternary. Four deep ice cores [EPICA-Dome C (75° 06'S, 123° 21'E), Dome B (77° 05' S, 94° 55' E), Vostok (78° S, 106° E) and Komsomolskaia (74° 05' S, 97° 29' E) have been investigated. Dust provenance in glacial and interglacial epochs has been identified through the 87Sr/86Sr versus 143Nd/144Nd isotopic signature of ice core dust and sediments from the Potential Source Areas (PSA) of the Southern Hemisphere. The isotopic method has been refined with respect to previous studies. Dust concentration and size distribution measurements have been performed at high temporal resolution in order to examine the long-term and short-term variability of dust flux, from which important information about the conditions at the source region(s), the hydrological cycle and the transport patterns can be inferred. For all East Antarctic sites investigated, dust originates from the southern South American regions of the Pampas and Patagonia in glacial times, but during warm interglacial periods an additional source probably contributed. The dust input also has proved to be remarkably similar between the different sites, and shows clear relationship with environmental conditions at the source regions. However, such an apparent uniformity of dust flux nests striking differences in dust transport, particularly during the Last Glacial Maximum. The reorganization of atmospheric circulation in the circumantarctic during the last climatic transition generated asynchronous and even opposite changes in transport patterns in different sectors of the Antarctic Plateau. During the Deglaciation and the Holocene epochs, millennial and secular scale pulsations in dust advection to the Plateau are omnipresent. From site to site, periodicities are the same but the phasing of the variations is different. Such rhythm suggests a circumpolar displacement of ocean-sea iceatmosphere anomalies at ... |
author2 |
Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Università degli studi di Milano-Bicocca Jean Robert Petit; Valter Maggi |
format |
Doctoral or Postdoctoral Thesis |
author |
Delmonte, Barbara |
author_facet |
Delmonte, Barbara |
author_sort |
Delmonte, Barbara |
title |
Quaternary variations and origin of continental dust in East antarctica |
title_short |
Quaternary variations and origin of continental dust in East antarctica |
title_full |
Quaternary variations and origin of continental dust in East antarctica |
title_fullStr |
Quaternary variations and origin of continental dust in East antarctica |
title_full_unstemmed |
Quaternary variations and origin of continental dust in East antarctica |
title_sort |
quaternary variations and origin of continental dust in east antarctica |
publisher |
HAL CCSD |
publishDate |
2003 |
url |
https://theses.hal.science/tel-00701343 https://theses.hal.science/tel-00701343/document https://theses.hal.science/tel-00701343/file/These-Delmonte-2003.pdf |
geographic |
Antarctic East Antarctica Patagonia The Antarctic |
geographic_facet |
Antarctic East Antarctica Patagonia The Antarctic |
genre |
Antarc* Antarctic Antarctica Antarctique* East Antarctica EPICA ice core |
genre_facet |
Antarc* Antarctic Antarctica Antarctique* East Antarctica EPICA ice core |
op_source |
https://theses.hal.science/tel-00701343 Glaciology. Università degli studi di Milano-Bicocca, 2003. English. ⟨NNT : ⟩ |
op_relation |
tel-00701343 https://theses.hal.science/tel-00701343 https://theses.hal.science/tel-00701343/document https://theses.hal.science/tel-00701343/file/These-Delmonte-2003.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1798847992459952128 |
spelling |
ftunigrenoble:oai:HAL:tel-00701343v1 2024-05-12T07:54:16+00:00 Quaternary variations and origin of continental dust in East antarctica Origine et variation des concentrations et distributions des poussières d'origine continentale dans les forages de glace en Antarctique Delmonte, Barbara Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Università degli studi di Milano-Bicocca Jean Robert Petit; Valter Maggi 2003-12-16 https://theses.hal.science/tel-00701343 https://theses.hal.science/tel-00701343/document https://theses.hal.science/tel-00701343/file/These-Delmonte-2003.pdf en eng HAL CCSD tel-00701343 https://theses.hal.science/tel-00701343 https://theses.hal.science/tel-00701343/document https://theses.hal.science/tel-00701343/file/These-Delmonte-2003.pdf info:eu-repo/semantics/OpenAccess https://theses.hal.science/tel-00701343 Glaciology. Università degli studi di Milano-Bicocca, 2003. English. ⟨NNT : ⟩ aérosols minéraux continentaux carootte glaciaire Dome B Vostok Komsomolskaia signature isotopique interglaciaires Holocène propagation circumpolaire [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDV.EE.BIO]Life Sciences [q-bio]/Ecology environment/Bioclimatology info:eu-repo/semantics/doctoralThesis Theses 2003 ftunigrenoble 2024-04-18T02:22:47Z The mineral dust of continental origin windblown to the East Antarctic Plateau has been studied for its geographical provenance and variability during the Quaternary. Four deep ice cores [EPICA-Dome C (75° 06'S, 123° 21'E), Dome B (77° 05' S, 94° 55' E), Vostok (78° S, 106° E) and Komsomolskaia (74° 05' S, 97° 29' E) have been investigated. Dust provenance in glacial and interglacial epochs has been identified through the 87Sr/86Sr versus 143Nd/144Nd isotopic signature of ice core dust and sediments from the Potential Source Areas (PSA) of the Southern Hemisphere. The isotopic method has been refined with respect to previous studies. Dust concentration and size distribution measurements have been performed at high temporal resolution in order to examine the long-term and short-term variability of dust flux, from which important information about the conditions at the source region(s), the hydrological cycle and the transport patterns can be inferred. For all East Antarctic sites investigated, dust originates from the southern South American regions of the Pampas and Patagonia in glacial times, but during warm interglacial periods an additional source probably contributed. The dust input also has proved to be remarkably similar between the different sites, and shows clear relationship with environmental conditions at the source regions. However, such an apparent uniformity of dust flux nests striking differences in dust transport, particularly during the Last Glacial Maximum. The reorganization of atmospheric circulation in the circumantarctic during the last climatic transition generated asynchronous and even opposite changes in transport patterns in different sectors of the Antarctic Plateau. During the Deglaciation and the Holocene epochs, millennial and secular scale pulsations in dust advection to the Plateau are omnipresent. From site to site, periodicities are the same but the phasing of the variations is different. Such rhythm suggests a circumpolar displacement of ocean-sea iceatmosphere anomalies at ... Doctoral or Postdoctoral Thesis Antarc* Antarctic Antarctica Antarctique* East Antarctica EPICA ice core Université Grenoble Alpes: HAL Antarctic East Antarctica Patagonia The Antarctic |