Simulation of the cold climate event 8200 years ago by meltwater outburst from Lake Agassiz
The cold climate anomaly about 8200 years ago is investigated with CLIMBER-2, a coupled atmosphere-ocean-biosphere model of intermediate complexity. This climate model simulates a cooling of about 3.6 K over the North Atlantic induced by a meltwater pulse from Lake Agassiz routed through the Hudson...
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American Geophysical Union
2004
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ftunivcmadrid:oai:www.ucm.es:37957 2023-05-15T16:35:39+02:00 Simulation of the cold climate event 8200 years ago by meltwater outburst from Lake Agassiz Bauer, E. Ganopolski, A. Montoya Redondo, María Luisa 2004-09-21 application/pdf https://eprints.ucm.es/id/eprint/37957/ https://eprints.ucm.es/id/eprint/37957/1/montoya18libre.pdf https://doi.org/10.1029/2004PA001030 en eng American Geophysical Union https://eprints.ucm.es/id/eprint/37957/1/montoya18libre.pdf info:eu-repo/semantics/openAccess Astrofísica Astronomía info:eu-repo/semantics/article PeerReviewed 2004 ftunivcmadrid https://doi.org/10.1029/2004PA001030 2022-05-12T20:02:04Z The cold climate anomaly about 8200 years ago is investigated with CLIMBER-2, a coupled atmosphere-ocean-biosphere model of intermediate complexity. This climate model simulates a cooling of about 3.6 K over the North Atlantic induced by a meltwater pulse from Lake Agassiz routed through the Hudson strait. The meltwater pulse is assumed to have a volume of 1.6 x 10^14 m^3 and a period of discharge of 2 years on the basis of glaciological modeling of the decay of the Laurentide Ice Sheet ( LIS). We present a possible mechanism which can explain the centennial duration of the 8.2 ka cold event. The mechanism is related to the existence of an additional equilibrium climate state with reduced North Atlantic Deep Water (NADW) formation and a southward shift of the NADW formation area. Hints at the additional climate state were obtained from the largely varying duration of the pulse-induced cold episode in response to overlaid random freshwater fluctuations in Monte Carlo simulations. The model equilibrium state was attained by releasing a weak multicentury freshwater flux through the St. Lawrence pathway completed by the meltwater pulse. The existence of such a climate mode appears essential for reproducing climate anomalies in close agreement with paleoclimatic reconstructions of the 8.2 ka event. The results furthermore suggest that the temporal evolution of the cold event was partly a matter of chance. Article in Journal/Newspaper Hudson Strait Ice Sheet NADW North Atlantic Deep Water North Atlantic Universidad Complutense de Madrid (UCM): E-Prints Complutense Hudson Hudson Strait ENVELOPE(-70.000,-70.000,62.000,62.000) Paleoceanography 19 3 n/a n/a |
institution |
Open Polar |
collection |
Universidad Complutense de Madrid (UCM): E-Prints Complutense |
op_collection_id |
ftunivcmadrid |
language |
English |
topic |
Astrofísica Astronomía |
spellingShingle |
Astrofísica Astronomía Bauer, E. Ganopolski, A. Montoya Redondo, María Luisa Simulation of the cold climate event 8200 years ago by meltwater outburst from Lake Agassiz |
topic_facet |
Astrofísica Astronomía |
description |
The cold climate anomaly about 8200 years ago is investigated with CLIMBER-2, a coupled atmosphere-ocean-biosphere model of intermediate complexity. This climate model simulates a cooling of about 3.6 K over the North Atlantic induced by a meltwater pulse from Lake Agassiz routed through the Hudson strait. The meltwater pulse is assumed to have a volume of 1.6 x 10^14 m^3 and a period of discharge of 2 years on the basis of glaciological modeling of the decay of the Laurentide Ice Sheet ( LIS). We present a possible mechanism which can explain the centennial duration of the 8.2 ka cold event. The mechanism is related to the existence of an additional equilibrium climate state with reduced North Atlantic Deep Water (NADW) formation and a southward shift of the NADW formation area. Hints at the additional climate state were obtained from the largely varying duration of the pulse-induced cold episode in response to overlaid random freshwater fluctuations in Monte Carlo simulations. The model equilibrium state was attained by releasing a weak multicentury freshwater flux through the St. Lawrence pathway completed by the meltwater pulse. The existence of such a climate mode appears essential for reproducing climate anomalies in close agreement with paleoclimatic reconstructions of the 8.2 ka event. The results furthermore suggest that the temporal evolution of the cold event was partly a matter of chance. |
format |
Article in Journal/Newspaper |
author |
Bauer, E. Ganopolski, A. Montoya Redondo, María Luisa |
author_facet |
Bauer, E. Ganopolski, A. Montoya Redondo, María Luisa |
author_sort |
Bauer, E. |
title |
Simulation of the cold climate event 8200 years ago by meltwater outburst from Lake Agassiz |
title_short |
Simulation of the cold climate event 8200 years ago by meltwater outburst from Lake Agassiz |
title_full |
Simulation of the cold climate event 8200 years ago by meltwater outburst from Lake Agassiz |
title_fullStr |
Simulation of the cold climate event 8200 years ago by meltwater outburst from Lake Agassiz |
title_full_unstemmed |
Simulation of the cold climate event 8200 years ago by meltwater outburst from Lake Agassiz |
title_sort |
simulation of the cold climate event 8200 years ago by meltwater outburst from lake agassiz |
publisher |
American Geophysical Union |
publishDate |
2004 |
url |
https://eprints.ucm.es/id/eprint/37957/ https://eprints.ucm.es/id/eprint/37957/1/montoya18libre.pdf https://doi.org/10.1029/2004PA001030 |
long_lat |
ENVELOPE(-70.000,-70.000,62.000,62.000) |
geographic |
Hudson Hudson Strait |
geographic_facet |
Hudson Hudson Strait |
genre |
Hudson Strait Ice Sheet NADW North Atlantic Deep Water North Atlantic |
genre_facet |
Hudson Strait Ice Sheet NADW North Atlantic Deep Water North Atlantic |
op_relation |
https://eprints.ucm.es/id/eprint/37957/1/montoya18libre.pdf |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2004PA001030 |
container_title |
Paleoceanography |
container_volume |
19 |
container_issue |
3 |
container_start_page |
n/a |
op_container_end_page |
n/a |
_version_ |
1766025919634341888 |