Neglecting ice-atmosphere interactions underestimates ice sheet melt in millennial-scale deglaciation simulations
Dynamic and thermodynamic interactions between the atmosphere and underlying ice sheets are generally not represented in the traditional one-way boundary condition forcing used to drive ice sheet models. This shortcoming is investigated through a series of idealized millennial-scale deglaciation sim...
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ftcdlib:qt257432k2 2023-05-15T16:39:52+02:00 Neglecting ice-atmosphere interactions underestimates ice sheet melt in millennial-scale deglaciation simulations Pritchard, M. S. Bush, A. B. Marshall, S. J. 2008-01-01 application/pdf http://www.escholarship.org/uc/item/257432k2 english eng eScholarship, University of California qt257432k2 http://www.escholarship.org/uc/item/257432k2 Attribution (CC BY): http://creativecommons.org/licenses/by/3.0/ CC-BY Pritchard, M. S.; Bush, A. B.; & Marshall, S. J.(2008). Neglecting ice-atmosphere interactions underestimates ice sheet melt in millennial-scale deglaciation simulations. Geophysical Research Letters, 35(1). UC Irvine: Retrieved from: http://www.escholarship.org/uc/item/257432k2 Physical Sciences and Mathematics last glacial maximum surface albedo in-situ climate laurentide Switzerland relaxation model article 2008 ftcdlib 2016-04-02T18:39:06Z Dynamic and thermodynamic interactions between the atmosphere and underlying ice sheets are generally not represented in the traditional one-way boundary condition forcing used to drive ice sheet models. This shortcoming is investigated through a series of idealized millennial-scale deglaciation simulations designed to isolate the mechanisms regulating the deglaciation timescale of the Laurentide ice sheet. Sensitivity experiments indicate that the conventional use of one-way (non-interactive) atmospheric forcing fields leads to an unrealistically insensitive melt response in the ice sheet model even when atmospheric carbon dioxide is set to modern preindustrial levels and Earth's angle of obliquity is set to its early Holocene value. A more realistic deglaciation timescale is obtained only through the application of a new two-way (interactive) asynchronous ice-atmosphere coupling scheme and a seasonal ice albedo parameterization that accounts for the observed darkening of ice in the moist summertime ablation zone. Article in Journal/Newspaper Ice Sheet University of California: eScholarship |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
English |
topic |
Physical Sciences and Mathematics last glacial maximum surface albedo in-situ climate laurentide Switzerland relaxation model |
spellingShingle |
Physical Sciences and Mathematics last glacial maximum surface albedo in-situ climate laurentide Switzerland relaxation model Pritchard, M. S. Bush, A. B. Marshall, S. J. Neglecting ice-atmosphere interactions underestimates ice sheet melt in millennial-scale deglaciation simulations |
topic_facet |
Physical Sciences and Mathematics last glacial maximum surface albedo in-situ climate laurentide Switzerland relaxation model |
description |
Dynamic and thermodynamic interactions between the atmosphere and underlying ice sheets are generally not represented in the traditional one-way boundary condition forcing used to drive ice sheet models. This shortcoming is investigated through a series of idealized millennial-scale deglaciation simulations designed to isolate the mechanisms regulating the deglaciation timescale of the Laurentide ice sheet. Sensitivity experiments indicate that the conventional use of one-way (non-interactive) atmospheric forcing fields leads to an unrealistically insensitive melt response in the ice sheet model even when atmospheric carbon dioxide is set to modern preindustrial levels and Earth's angle of obliquity is set to its early Holocene value. A more realistic deglaciation timescale is obtained only through the application of a new two-way (interactive) asynchronous ice-atmosphere coupling scheme and a seasonal ice albedo parameterization that accounts for the observed darkening of ice in the moist summertime ablation zone. |
format |
Article in Journal/Newspaper |
author |
Pritchard, M. S. Bush, A. B. Marshall, S. J. |
author_facet |
Pritchard, M. S. Bush, A. B. Marshall, S. J. |
author_sort |
Pritchard, M. S. |
title |
Neglecting ice-atmosphere interactions underestimates ice sheet melt in millennial-scale deglaciation simulations |
title_short |
Neglecting ice-atmosphere interactions underestimates ice sheet melt in millennial-scale deglaciation simulations |
title_full |
Neglecting ice-atmosphere interactions underestimates ice sheet melt in millennial-scale deglaciation simulations |
title_fullStr |
Neglecting ice-atmosphere interactions underestimates ice sheet melt in millennial-scale deglaciation simulations |
title_full_unstemmed |
Neglecting ice-atmosphere interactions underestimates ice sheet melt in millennial-scale deglaciation simulations |
title_sort |
neglecting ice-atmosphere interactions underestimates ice sheet melt in millennial-scale deglaciation simulations |
publisher |
eScholarship, University of California |
publishDate |
2008 |
url |
http://www.escholarship.org/uc/item/257432k2 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Pritchard, M. S.; Bush, A. B.; & Marshall, S. J.(2008). Neglecting ice-atmosphere interactions underestimates ice sheet melt in millennial-scale deglaciation simulations. Geophysical Research Letters, 35(1). UC Irvine: Retrieved from: http://www.escholarship.org/uc/item/257432k2 |
op_relation |
qt257432k2 http://www.escholarship.org/uc/item/257432k2 |
op_rights |
Attribution (CC BY): http://creativecommons.org/licenses/by/3.0/ |
op_rightsnorm |
CC-BY |
_version_ |
1766030217979101184 |