Interannual Atmospheric Variability Affects Continental Ice Sheet Simulations on Millennial Time Scales
To inform the ongoing development of earth system models that aim to incorporate interactive ice, the potential impact of interannual variability associated with synoptic variability and El Niño–Southern Oscillation (ENSO) at the Last Glacial Maximum (LGM) on the evolution of a large continental ice...
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Language: | English |
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ftcdlib:qt4pv319p3 2023-05-15T16:29:27+02:00 Interannual Atmospheric Variability Affects Continental Ice Sheet Simulations on Millennial Time Scales Pritchard, Michael S Bush, Andrew B. G Marshall, Shawn J 5976 - 5992 2008-11-01 application/pdf http://www.escholarship.org/uc/item/4pv319p3 english eng eScholarship, University of California qt4pv319p3 http://www.escholarship.org/uc/item/4pv319p3 Attribution (CC BY): http://creativecommons.org/licenses/by/3.0/ CC-BY Pritchard, Michael S; Bush, Andrew B. G; & Marshall, Shawn J. (2008). Interannual Atmospheric Variability Affects Continental Ice Sheet Simulations on Millennial Time Scales. Journal of Climate, 21(22), 5976 - 5992. doi:10.1175/2008JCLI2327.1. UC Irvine: Retrieved from: http://www.escholarship.org/uc/item/4pv319p3 Physical Sciences and Mathematics last glacial maximum Niño-southern-oscillation Pacific decadal oscillation general-circulation model sea-surface temperature El-Niño mass-balance climate ENSO Greenland article 2008 ftcdlib https://doi.org/10.1175/2008JCLI2327.1 2016-04-02T18:41:44Z To inform the ongoing development of earth system models that aim to incorporate interactive ice, the potential impact of interannual variability associated with synoptic variability and El Niño–Southern Oscillation (ENSO) at the Last Glacial Maximum (LGM) on the evolution of a large continental ice sheet is explored through a series of targeted numerical modeling experiments. Global and North American signatures of ENSO at the LGM are described based on a multidecadal paleoclimate simulation using an atmosphere–ocean general circulation model (AOGCM). Experiments in which a thermomechanical North American ice sheet model (ISM) was forced with persistent LGM ENSO composite anomaly maps derived from the AOGCM showed only modest ice sheet thickness sensitivity to ENSO teleconnections. In contrast, very high model sensitivity was found when North American climate variations were incorporated directly in the ISM as a looping interannual time series. Under this configuration, localized transient cold anomalies in the atmospheric record instigated substantial new ice formation through a dynamically mediated feedback at the ice sheet margin, altering the equilibrium geometry and resulting in a bulk 10% growth of the Laurentide ice sheet volume over 5 kyr. Article in Journal/Newspaper Greenland Ice Sheet University of California: eScholarship Greenland Pacific Journal of Climate 21 22 5976 5992 |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
English |
topic |
Physical Sciences and Mathematics last glacial maximum Niño-southern-oscillation Pacific decadal oscillation general-circulation model sea-surface temperature El-Niño mass-balance climate ENSO Greenland |
spellingShingle |
Physical Sciences and Mathematics last glacial maximum Niño-southern-oscillation Pacific decadal oscillation general-circulation model sea-surface temperature El-Niño mass-balance climate ENSO Greenland Pritchard, Michael S Bush, Andrew B. G Marshall, Shawn J Interannual Atmospheric Variability Affects Continental Ice Sheet Simulations on Millennial Time Scales |
topic_facet |
Physical Sciences and Mathematics last glacial maximum Niño-southern-oscillation Pacific decadal oscillation general-circulation model sea-surface temperature El-Niño mass-balance climate ENSO Greenland |
description |
To inform the ongoing development of earth system models that aim to incorporate interactive ice, the potential impact of interannual variability associated with synoptic variability and El Niño–Southern Oscillation (ENSO) at the Last Glacial Maximum (LGM) on the evolution of a large continental ice sheet is explored through a series of targeted numerical modeling experiments. Global and North American signatures of ENSO at the LGM are described based on a multidecadal paleoclimate simulation using an atmosphere–ocean general circulation model (AOGCM). Experiments in which a thermomechanical North American ice sheet model (ISM) was forced with persistent LGM ENSO composite anomaly maps derived from the AOGCM showed only modest ice sheet thickness sensitivity to ENSO teleconnections. In contrast, very high model sensitivity was found when North American climate variations were incorporated directly in the ISM as a looping interannual time series. Under this configuration, localized transient cold anomalies in the atmospheric record instigated substantial new ice formation through a dynamically mediated feedback at the ice sheet margin, altering the equilibrium geometry and resulting in a bulk 10% growth of the Laurentide ice sheet volume over 5 kyr. |
format |
Article in Journal/Newspaper |
author |
Pritchard, Michael S Bush, Andrew B. G Marshall, Shawn J |
author_facet |
Pritchard, Michael S Bush, Andrew B. G Marshall, Shawn J |
author_sort |
Pritchard, Michael S |
title |
Interannual Atmospheric Variability Affects Continental Ice Sheet Simulations on Millennial Time Scales |
title_short |
Interannual Atmospheric Variability Affects Continental Ice Sheet Simulations on Millennial Time Scales |
title_full |
Interannual Atmospheric Variability Affects Continental Ice Sheet Simulations on Millennial Time Scales |
title_fullStr |
Interannual Atmospheric Variability Affects Continental Ice Sheet Simulations on Millennial Time Scales |
title_full_unstemmed |
Interannual Atmospheric Variability Affects Continental Ice Sheet Simulations on Millennial Time Scales |
title_sort |
interannual atmospheric variability affects continental ice sheet simulations on millennial time scales |
publisher |
eScholarship, University of California |
publishDate |
2008 |
url |
http://www.escholarship.org/uc/item/4pv319p3 |
op_coverage |
5976 - 5992 |
geographic |
Greenland Pacific |
geographic_facet |
Greenland Pacific |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
Pritchard, Michael S; Bush, Andrew B. G; & Marshall, Shawn J. (2008). Interannual Atmospheric Variability Affects Continental Ice Sheet Simulations on Millennial Time Scales. Journal of Climate, 21(22), 5976 - 5992. doi:10.1175/2008JCLI2327.1. UC Irvine: Retrieved from: http://www.escholarship.org/uc/item/4pv319p3 |
op_relation |
qt4pv319p3 http://www.escholarship.org/uc/item/4pv319p3 |
op_rights |
Attribution (CC BY): http://creativecommons.org/licenses/by/3.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1175/2008JCLI2327.1 |
container_title |
Journal of Climate |
container_volume |
21 |
container_issue |
22 |
container_start_page |
5976 |
op_container_end_page |
5992 |
_version_ |
1766019145816604672 |