Paleoclimatic Tracers' An Investigation Using an Atmospheric General Circulation Model Under Ice Age Conditions
International audience Many studies with atmospheric general circulation models (AGCMs) have demonstrated their usefulness in reconstructing past climates. In a new approach, we have used an AGCM to investigate the link between tracer cycles and climate. We consider in this paper the atmospheric cyc...
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Online Access: | https://hal.archives-ouvertes.fr/hal-03334788 https://hal.archives-ouvertes.fr/hal-03334788/document https://hal.archives-ouvertes.fr/hal-03334788/file/jgrD1993Joussaume2767.pdf https://doi.org/10.1029/92JD01921 |
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ftccsdartic:oai:HAL:hal-03334788v1 2023-05-15T14:05:19+02:00 Paleoclimatic Tracers' An Investigation Using an Atmospheric General Circulation Model Under Ice Age Conditions Joussaume, Sylvie Laboratoire de Modélisation du Climat et de l'Environnement (LMCE) 1993-02-20 https://hal.archives-ouvertes.fr/hal-03334788 https://hal.archives-ouvertes.fr/hal-03334788/document https://hal.archives-ouvertes.fr/hal-03334788/file/jgrD1993Joussaume2767.pdf https://doi.org/10.1029/92JD01921 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/92JD01921 hal-03334788 https://hal.archives-ouvertes.fr/hal-03334788 https://hal.archives-ouvertes.fr/hal-03334788/document https://hal.archives-ouvertes.fr/hal-03334788/file/jgrD1993Joussaume2767.pdf doi:10.1029/92JD01921 info:eu-repo/semantics/OpenAccess ISSN: 2169-897X EISSN: 2169-8996 Journal of Geophysical Research: Atmospheres https://hal.archives-ouvertes.fr/hal-03334788 Journal of Geophysical Research: Atmospheres, American Geophysical Union, 1993, 98 (D2), pp.2767-2805. ⟨10.1029/92JD01921⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment info:eu-repo/semantics/article Journal articles 1993 ftccsdartic https://doi.org/10.1029/92JD01921 2021-09-11T22:23:54Z International audience Many studies with atmospheric general circulation models (AGCMs) have demonstrated their usefulness in reconstructing past climates. In a new approach, we have used an AGCM to investigate the link between tracer cycles and climate. We consider in this paper the atmospheric cycle of windblown dust material from desertic areas and in part 2 the water isotope cycles. Studies from ice cores have shown a strong increase of the dust deposits during glacial periods, both over East Antarctica and Greenland. We do not know, however, whether this past increase is global or just a local feature, where the dust came from, and what are the mechanisms yielding this increase. We try to answer to these questions by using an AGCM including a model for the desert dust cycle to simulate the present-day and Last Glacial Maximum climates for February and August. The model simulates only a weak increase of the global atmospheric dust content. Stronger variations are obtained at a regional scale and are in good agreement with observations from deep-sea sediments. However, the model does not reproduce the great increase of the dust concentration in snow that has been observed in ice cores. Several model deficiencies can induce this model-data discrepancy as, for example, inaccuracies of the circulation patterns or of the dust model. However, most likely, the model fails to simulate the actual sources of dust. Article in Journal/Newspaper Antarc* Antarctica East Antarctica Greenland Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) East Antarctica Greenland Journal of Geophysical Research: Atmospheres 98 D2 2767 2805 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment Joussaume, Sylvie Paleoclimatic Tracers' An Investigation Using an Atmospheric General Circulation Model Under Ice Age Conditions |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
description |
International audience Many studies with atmospheric general circulation models (AGCMs) have demonstrated their usefulness in reconstructing past climates. In a new approach, we have used an AGCM to investigate the link between tracer cycles and climate. We consider in this paper the atmospheric cycle of windblown dust material from desertic areas and in part 2 the water isotope cycles. Studies from ice cores have shown a strong increase of the dust deposits during glacial periods, both over East Antarctica and Greenland. We do not know, however, whether this past increase is global or just a local feature, where the dust came from, and what are the mechanisms yielding this increase. We try to answer to these questions by using an AGCM including a model for the desert dust cycle to simulate the present-day and Last Glacial Maximum climates for February and August. The model simulates only a weak increase of the global atmospheric dust content. Stronger variations are obtained at a regional scale and are in good agreement with observations from deep-sea sediments. However, the model does not reproduce the great increase of the dust concentration in snow that has been observed in ice cores. Several model deficiencies can induce this model-data discrepancy as, for example, inaccuracies of the circulation patterns or of the dust model. However, most likely, the model fails to simulate the actual sources of dust. |
author2 |
Laboratoire de Modélisation du Climat et de l'Environnement (LMCE) |
format |
Article in Journal/Newspaper |
author |
Joussaume, Sylvie |
author_facet |
Joussaume, Sylvie |
author_sort |
Joussaume, Sylvie |
title |
Paleoclimatic Tracers' An Investigation Using an Atmospheric General Circulation Model Under Ice Age Conditions |
title_short |
Paleoclimatic Tracers' An Investigation Using an Atmospheric General Circulation Model Under Ice Age Conditions |
title_full |
Paleoclimatic Tracers' An Investigation Using an Atmospheric General Circulation Model Under Ice Age Conditions |
title_fullStr |
Paleoclimatic Tracers' An Investigation Using an Atmospheric General Circulation Model Under Ice Age Conditions |
title_full_unstemmed |
Paleoclimatic Tracers' An Investigation Using an Atmospheric General Circulation Model Under Ice Age Conditions |
title_sort |
paleoclimatic tracers' an investigation using an atmospheric general circulation model under ice age conditions |
publisher |
HAL CCSD |
publishDate |
1993 |
url |
https://hal.archives-ouvertes.fr/hal-03334788 https://hal.archives-ouvertes.fr/hal-03334788/document https://hal.archives-ouvertes.fr/hal-03334788/file/jgrD1993Joussaume2767.pdf https://doi.org/10.1029/92JD01921 |
geographic |
East Antarctica Greenland |
geographic_facet |
East Antarctica Greenland |
genre |
Antarc* Antarctica East Antarctica Greenland |
genre_facet |
Antarc* Antarctica East Antarctica Greenland |
op_source |
ISSN: 2169-897X EISSN: 2169-8996 Journal of Geophysical Research: Atmospheres https://hal.archives-ouvertes.fr/hal-03334788 Journal of Geophysical Research: Atmospheres, American Geophysical Union, 1993, 98 (D2), pp.2767-2805. ⟨10.1029/92JD01921⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/92JD01921 hal-03334788 https://hal.archives-ouvertes.fr/hal-03334788 https://hal.archives-ouvertes.fr/hal-03334788/document https://hal.archives-ouvertes.fr/hal-03334788/file/jgrD1993Joussaume2767.pdf doi:10.1029/92JD01921 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/92JD01921 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
98 |
container_issue |
D2 |
container_start_page |
2767 |
op_container_end_page |
2805 |
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1766277136737370112 |