The North American Cordillera--An impediment to growing the continent-wide Laurentide ice sheet
This study examines the evolution of a continental-scale ice sheet on a triangular representation of North America, with and without the influence of the Cordilleran region. Simulations are conducted using a comprehensive atmospheric general circulation model asynchronously coupled to a three-dimens...
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American Meteorological Society
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ftncar:oai:drupal-site.org:articles_17774 2023-09-05T13:20:14+02:00 The North American Cordillera--An impediment to growing the continent-wide Laurentide ice sheet Lofverstrom, Marcus (author) Liakka, Johan (author) Kleman, Johan (author) 2015-12-01 application/pdf http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-022-428 https://doi.org/10.1175/JCLI-D-15-0044.1 en eng American Meteorological Society Journal of Climate ark:/85065/d7pv6mvw http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-022-428 doi:10.1175/JCLI-D-15-0044.1 Copyright 2015 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be "fair use" under Section 107 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Law (17 USC, as revised by P.L. 94-553) does not require the Society's permission. Republication, systematic reproduction, posting in electronic form on servers, or other uses of this material, except as exempted by the above statements, requires written permission or license from the AMS. Additional details are provided in the AMS Copyright Policies, available from the AMS at 617-227-2425 or amspubs@ametsoc.org. Permission to place a copy of this work on this server has been provided by the AMS. The AMS does not guarantee that the copy provided here is an accurate copy of the published work. Text article 2015 ftncar https://doi.org/10.1175/JCLI-D-15-0044.1 2023-08-14T18:44:23Z This study examines the evolution of a continental-scale ice sheet on a triangular representation of North America, with and without the influence of the Cordilleran region. Simulations are conducted using a comprehensive atmospheric general circulation model asynchronously coupled to a three-dimensional thermomechanical ice-sheet model. The atmospheric state is updated for every 2 × 106 km3 increase in ice volume, and the coupled model is integrated to steady state. In the first experiment a flat continent with no background topography is used. The ice sheet evolves fairly zonally symmetric, and the equilibrium state is continent-wide and has the highest point in the center of the continent. This equilibrium ice sheet forces an anticyclonic circulation that results in relatively warmer (cooler) summer surface temperatures in the northwest (southeast), owing to warm (cold) air advection and radiative heating due to reduced cloudiness. The second experiment includes a simplified representation of the Cordilleran region. The ice sheet’s equilibrium state is here structurally different from the flat continent case; the center of mass is strongly shifted to the east and the interior of the continent remains ice free—an outline broadly resembling the geologically determined ice margin in Marine Isotope Stage 4. The limited glaciation in the continental interior is the result of warm summer surface temperatures primarily due to stationary waves and radiative feedbacks. Article in Journal/Newspaper Ice Sheet OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Journal of Climate 28 23 9433 9450 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
This study examines the evolution of a continental-scale ice sheet on a triangular representation of North America, with and without the influence of the Cordilleran region. Simulations are conducted using a comprehensive atmospheric general circulation model asynchronously coupled to a three-dimensional thermomechanical ice-sheet model. The atmospheric state is updated for every 2 × 106 km3 increase in ice volume, and the coupled model is integrated to steady state. In the first experiment a flat continent with no background topography is used. The ice sheet evolves fairly zonally symmetric, and the equilibrium state is continent-wide and has the highest point in the center of the continent. This equilibrium ice sheet forces an anticyclonic circulation that results in relatively warmer (cooler) summer surface temperatures in the northwest (southeast), owing to warm (cold) air advection and radiative heating due to reduced cloudiness. The second experiment includes a simplified representation of the Cordilleran region. The ice sheet’s equilibrium state is here structurally different from the flat continent case; the center of mass is strongly shifted to the east and the interior of the continent remains ice free—an outline broadly resembling the geologically determined ice margin in Marine Isotope Stage 4. The limited glaciation in the continental interior is the result of warm summer surface temperatures primarily due to stationary waves and radiative feedbacks. |
author2 |
Lofverstrom, Marcus (author) Liakka, Johan (author) Kleman, Johan (author) |
format |
Article in Journal/Newspaper |
title |
The North American Cordillera--An impediment to growing the continent-wide Laurentide ice sheet |
spellingShingle |
The North American Cordillera--An impediment to growing the continent-wide Laurentide ice sheet |
title_short |
The North American Cordillera--An impediment to growing the continent-wide Laurentide ice sheet |
title_full |
The North American Cordillera--An impediment to growing the continent-wide Laurentide ice sheet |
title_fullStr |
The North American Cordillera--An impediment to growing the continent-wide Laurentide ice sheet |
title_full_unstemmed |
The North American Cordillera--An impediment to growing the continent-wide Laurentide ice sheet |
title_sort |
north american cordillera--an impediment to growing the continent-wide laurentide ice sheet |
publisher |
American Meteorological Society |
publishDate |
2015 |
url |
http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-022-428 https://doi.org/10.1175/JCLI-D-15-0044.1 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
Journal of Climate ark:/85065/d7pv6mvw http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-022-428 doi:10.1175/JCLI-D-15-0044.1 |
op_rights |
Copyright 2015 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be "fair use" under Section 107 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Law (17 USC, as revised by P.L. 94-553) does not require the Society's permission. Republication, systematic reproduction, posting in electronic form on servers, or other uses of this material, except as exempted by the above statements, requires written permission or license from the AMS. Additional details are provided in the AMS Copyright Policies, available from the AMS at 617-227-2425 or amspubs@ametsoc.org. Permission to place a copy of this work on this server has been provided by the AMS. The AMS does not guarantee that the copy provided here is an accurate copy of the published work. |
op_doi |
https://doi.org/10.1175/JCLI-D-15-0044.1 |
container_title |
Journal of Climate |
container_volume |
28 |
container_issue |
23 |
container_start_page |
9433 |
op_container_end_page |
9450 |
_version_ |
1776200946970263552 |