The Effects of the Laurentide Ice Sheet on North American Climate during the Last Glacial Maximum
A climate model, consisting of an atmospheric general circulation model coupled with a simple model of the oceanic mixed layer, is used to investigate the effects of the continental ice distribution of the last glacial maximum (LGM) on North American climate. This model has previously been used to s...
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1987
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fterudit:oai:erudit.org:032684ar 2023-05-15T16:40:19+02:00 The Effects of the Laurentide Ice Sheet on North American Climate during the Last Glacial Maximum Broccoli, A. J. Manabe, S. 1987 http://id.erudit.org/iderudit/032684ar https://doi.org/10.7202/032684ar en eng Les Presses de l'Université de Montréal Érudit Géographie physique et Quaternaire vol. 41 no. 2 (1987) http://id.erudit.org/iderudit/032684ar doi:10.7202/032684ar Tous droits réservés © Les Presses de l'Université de Montréal, 1987 text 1987 fterudit https://doi.org/10.7202/032684ar 2022-09-24T23:13:39Z A climate model, consisting of an atmospheric general circulation model coupled with a simple model of the oceanic mixed layer, is used to investigate the effects of the continental ice distribution of the last glacial maximum (LGM) on North American climate. This model has previously been used to simulate the LGM climate, producing temperature changes reasonably in agreement with paleoclimatic data. The LGM distribution of continental ice according to the maximum reconstruction of HUGHES et al. (1981) is used as input to the model. In response to the incorporation of the expanded continental ice of the LGM, the model produces major changes in the climate of North America. The ice sheet exerts an orographic effect on the tropospheric flow, resulting in a splitting of the midlatitude westerlies in all seasons but summer. Winter temperatures are greatly reduced over a wide region south of the Laurentide ice sheet, although summer cooling is less extensive. An area of reduced soil moisture develops in the interior of North America just south of the ice margin. At the same time, precipitation increases in a belt extending from the extreme southeastern portion of the ice sheet eastward into the North Atlantic. Some of these findings are similar to paleoclimatic inferences based on geological evidence. Un modèle climatique, composé d'un modèle de circulation atmosphérique général associé à un modèle simple de la couche océanique mixte, a servi à étudier l'influence de la répartition des glaciers continentaux sur le climat de l'Amérique du Nord au dernier pléniglaciaire. Ce modèle avait déjà servi pour simuler le climat au dernier pléniglaciaire; il a montré des changements de températures concordant assez bien avec les données paléoclimatiques. La répartition des glaces continentales pendant le pléniglaciaire selon l'hypothèse d'extension maximale de HUGHES et al. (1981) a servi à la modélisation. En réponse à l'incorporation des données de cette hypothèse, le modèle fait voir des changements majeurs dans le climat ... Text Ice Sheet North Atlantic Érudit.org (Université Montréal) Géographie physique et Quaternaire 41 2 291 299 |
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English |
description |
A climate model, consisting of an atmospheric general circulation model coupled with a simple model of the oceanic mixed layer, is used to investigate the effects of the continental ice distribution of the last glacial maximum (LGM) on North American climate. This model has previously been used to simulate the LGM climate, producing temperature changes reasonably in agreement with paleoclimatic data. The LGM distribution of continental ice according to the maximum reconstruction of HUGHES et al. (1981) is used as input to the model. In response to the incorporation of the expanded continental ice of the LGM, the model produces major changes in the climate of North America. The ice sheet exerts an orographic effect on the tropospheric flow, resulting in a splitting of the midlatitude westerlies in all seasons but summer. Winter temperatures are greatly reduced over a wide region south of the Laurentide ice sheet, although summer cooling is less extensive. An area of reduced soil moisture develops in the interior of North America just south of the ice margin. At the same time, precipitation increases in a belt extending from the extreme southeastern portion of the ice sheet eastward into the North Atlantic. Some of these findings are similar to paleoclimatic inferences based on geological evidence. Un modèle climatique, composé d'un modèle de circulation atmosphérique général associé à un modèle simple de la couche océanique mixte, a servi à étudier l'influence de la répartition des glaciers continentaux sur le climat de l'Amérique du Nord au dernier pléniglaciaire. Ce modèle avait déjà servi pour simuler le climat au dernier pléniglaciaire; il a montré des changements de températures concordant assez bien avec les données paléoclimatiques. La répartition des glaces continentales pendant le pléniglaciaire selon l'hypothèse d'extension maximale de HUGHES et al. (1981) a servi à la modélisation. En réponse à l'incorporation des données de cette hypothèse, le modèle fait voir des changements majeurs dans le climat ... |
format |
Text |
author |
Broccoli, A. J. Manabe, S. |
spellingShingle |
Broccoli, A. J. Manabe, S. The Effects of the Laurentide Ice Sheet on North American Climate during the Last Glacial Maximum |
author_facet |
Broccoli, A. J. Manabe, S. |
author_sort |
Broccoli, A. J. |
title |
The Effects of the Laurentide Ice Sheet on North American Climate during the Last Glacial Maximum |
title_short |
The Effects of the Laurentide Ice Sheet on North American Climate during the Last Glacial Maximum |
title_full |
The Effects of the Laurentide Ice Sheet on North American Climate during the Last Glacial Maximum |
title_fullStr |
The Effects of the Laurentide Ice Sheet on North American Climate during the Last Glacial Maximum |
title_full_unstemmed |
The Effects of the Laurentide Ice Sheet on North American Climate during the Last Glacial Maximum |
title_sort |
effects of the laurentide ice sheet on north american climate during the last glacial maximum |
publisher |
Les Presses de l'Université de Montréal |
publishDate |
1987 |
url |
http://id.erudit.org/iderudit/032684ar https://doi.org/10.7202/032684ar |
genre |
Ice Sheet North Atlantic |
genre_facet |
Ice Sheet North Atlantic |
op_relation |
Géographie physique et Quaternaire vol. 41 no. 2 (1987) http://id.erudit.org/iderudit/032684ar doi:10.7202/032684ar |
op_rights |
Tous droits réservés © Les Presses de l'Université de Montréal, 1987 |
op_doi |
https://doi.org/10.7202/032684ar |
container_title |
Géographie physique et Quaternaire |
container_volume |
41 |
container_issue |
2 |
container_start_page |
291 |
op_container_end_page |
299 |
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1766030704584425472 |