Paleoclimatic tracers: An investigation using an atmospheric general circulation model under ice age conditions - 2. Water isotopes
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.science/hal-03334789 https://hal.science/hal-03334789/document https://hal.science/hal-03334789/file/92JD01920%281%29.pdf https://doi.org/10.1029/92JD01920 |
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ftecoleponts:oai:HAL:hal-03334789v1 2024-09-15T17:48:39+00:00 Paleoclimatic tracers: An investigation using an atmospheric general circulation model under ice age conditions - 2. Water isotopes Joussaume, Sylvie Jouzel, Jean Laboratoire de Météorologie Dynamique (UMR 8539) (LMD) Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X) Institut Polytechnique de Paris (IP Paris)-Institut Polytechnique de Paris (IP Paris)-École des Ponts ParisTech (ENPC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL) Laboratoire de Modélisation du Climat et de l'Environnement (LMCE) 1993 https://hal.science/hal-03334789 https://hal.science/hal-03334789/document https://hal.science/hal-03334789/file/92JD01920%281%29.pdf https://doi.org/10.1029/92JD01920 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/92JD01920 hal-03334789 https://hal.science/hal-03334789 https://hal.science/hal-03334789/document https://hal.science/hal-03334789/file/92JD01920%281%29.pdf doi:10.1029/92JD01920 info:eu-repo/semantics/OpenAccess ISSN: 2169-897X EISSN: 2169-8996 Journal of Geophysical Research: Atmospheres https://hal.science/hal-03334789 Journal of Geophysical Research: Atmospheres, 1993, 98 (D2), pp.2807-2830. ⟨10.1029/92JD01920⟩ [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 1993 ftecoleponts https://doi.org/10.1029/92JD01920 2024-08-13T23:47:27Z 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 École des Ponts ParisTech: HAL Journal of Geophysical Research: Atmospheres 98 D2 2807 2830 |
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Open Polar |
collection |
École des Ponts ParisTech: HAL |
op_collection_id |
ftecoleponts |
language |
English |
topic |
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Joussaume, Sylvie Jouzel, Jean Paleoclimatic tracers: An investigation using an atmospheric general circulation model under ice age conditions - 2. Water isotopes |
topic_facet |
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
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 Météorologie Dynamique (UMR 8539) (LMD) Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X) Institut Polytechnique de Paris (IP Paris)-Institut Polytechnique de Paris (IP Paris)-École des Ponts ParisTech (ENPC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL) Laboratoire de Modélisation du Climat et de l'Environnement (LMCE) |
format |
Article in Journal/Newspaper |
author |
Joussaume, Sylvie Jouzel, Jean |
author_facet |
Joussaume, Sylvie Jouzel, Jean |
author_sort |
Joussaume, Sylvie |
title |
Paleoclimatic tracers: An investigation using an atmospheric general circulation model under ice age conditions - 2. Water isotopes |
title_short |
Paleoclimatic tracers: An investigation using an atmospheric general circulation model under ice age conditions - 2. Water isotopes |
title_full |
Paleoclimatic tracers: An investigation using an atmospheric general circulation model under ice age conditions - 2. Water isotopes |
title_fullStr |
Paleoclimatic tracers: An investigation using an atmospheric general circulation model under ice age conditions - 2. Water isotopes |
title_full_unstemmed |
Paleoclimatic tracers: An investigation using an atmospheric general circulation model under ice age conditions - 2. Water isotopes |
title_sort |
paleoclimatic tracers: an investigation using an atmospheric general circulation model under ice age conditions - 2. water isotopes |
publisher |
HAL CCSD |
publishDate |
1993 |
url |
https://hal.science/hal-03334789 https://hal.science/hal-03334789/document https://hal.science/hal-03334789/file/92JD01920%281%29.pdf https://doi.org/10.1029/92JD01920 |
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.science/hal-03334789 Journal of Geophysical Research: Atmospheres, 1993, 98 (D2), pp.2807-2830. ⟨10.1029/92JD01920⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/92JD01920 hal-03334789 https://hal.science/hal-03334789 https://hal.science/hal-03334789/document https://hal.science/hal-03334789/file/92JD01920%281%29.pdf doi:10.1029/92JD01920 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/92JD01920 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
98 |
container_issue |
D2 |
container_start_page |
2807 |
op_container_end_page |
2830 |
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