Model support for forcing of the 8.2 ka event by meltwater from the Hudson Bay ice dome
Previous model experiments of the 8.2 ka event forced by the drainage of Lake Agassiz often do not produce climate anomalies as long as those inferred from proxies. In addition to the Agassiz forcing, there is new evidence for significant amounts of freshwater entering the ocean at 8.2 ka from the d...
Published in: | Climate Dynamics |
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Language: | English |
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Online Access: | http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-019-879 https://doi.org/10.1007/s00382-013-1706-z |
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ftncar:oai:drupal-site.org:articles_12997 2023-09-05T13:20:04+02:00 Model support for forcing of the 8.2 ka event by meltwater from the Hudson Bay ice dome Wagner, Amy (author) Morrill, Carrie (author) Otto-Bliesner, Bette (author) Rosenbloom, Nan (author) Watkins, Kelsey (author) 2013-12-01 application/pdf http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-019-879 https://doi.org/10.1007/s00382-013-1706-z en eng Springer Climate Dynamics http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-019-879 doi:10.1007/s00382-013-1706-z ark:/85065/d7df6s3g Copyright 2013 Springer Berlin Heidelberg Text article 2013 ftncar https://doi.org/10.1007/s00382-013-1706-z 2023-08-14T18:38:28Z Previous model experiments of the 8.2 ka event forced by the drainage of Lake Agassiz often do not produce climate anomalies as long as those inferred from proxies. In addition to the Agassiz forcing, there is new evidence for significant amounts of freshwater entering the ocean at 8.2 ka from the disintegration of the Laurentide ice sheet (LIS). We use the Community Climate System Model version 3 (CCSM3) to test the contribution of this additional meltwater flux. Similar to previous model experiments, we find that the estimated freshwater forcing from Lake Agassiz is capable of sustaining ocean and climate anomalies for only two to three decades, much shorter than the event duration of ~150 years in proxies. Using new estimates of the LIS freshwater flux (~0.13 Sv for 100 years) from the collapse of the Hudson Bay ice dome in addition to the Agassiz drainage, the CCSM3 generates climate anomalies with a magnitude and duration that match within error those from proxies. This result is insensitive to the duration of freshwater release, a major uncertainty, if the total volume remains the same. An analysis of the modeled North Atlantic freshwater budget indicates that the Agassiz drainage is rapidly transported out of the North Atlantic while the LIS contribution generates longer-lasting freshwater anomalies that are also subject to recirculation by the subtropical gyre back into the North Atlantic. Thus, the meltwater flux originating from the LIS appears to be more important than the Agassiz drainage in generating 8.2 ka climate anomalies and is one way to reconcile some model-data discrepancies. Article in Journal/Newspaper Hudson Bay Ice Sheet North Atlantic OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Hudson Hudson Bay Climate Dynamics 41 11-12 2855 2873 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
Previous model experiments of the 8.2 ka event forced by the drainage of Lake Agassiz often do not produce climate anomalies as long as those inferred from proxies. In addition to the Agassiz forcing, there is new evidence for significant amounts of freshwater entering the ocean at 8.2 ka from the disintegration of the Laurentide ice sheet (LIS). We use the Community Climate System Model version 3 (CCSM3) to test the contribution of this additional meltwater flux. Similar to previous model experiments, we find that the estimated freshwater forcing from Lake Agassiz is capable of sustaining ocean and climate anomalies for only two to three decades, much shorter than the event duration of ~150 years in proxies. Using new estimates of the LIS freshwater flux (~0.13 Sv for 100 years) from the collapse of the Hudson Bay ice dome in addition to the Agassiz drainage, the CCSM3 generates climate anomalies with a magnitude and duration that match within error those from proxies. This result is insensitive to the duration of freshwater release, a major uncertainty, if the total volume remains the same. An analysis of the modeled North Atlantic freshwater budget indicates that the Agassiz drainage is rapidly transported out of the North Atlantic while the LIS contribution generates longer-lasting freshwater anomalies that are also subject to recirculation by the subtropical gyre back into the North Atlantic. Thus, the meltwater flux originating from the LIS appears to be more important than the Agassiz drainage in generating 8.2 ka climate anomalies and is one way to reconcile some model-data discrepancies. |
author2 |
Wagner, Amy (author) Morrill, Carrie (author) Otto-Bliesner, Bette (author) Rosenbloom, Nan (author) Watkins, Kelsey (author) |
format |
Article in Journal/Newspaper |
title |
Model support for forcing of the 8.2 ka event by meltwater from the Hudson Bay ice dome |
spellingShingle |
Model support for forcing of the 8.2 ka event by meltwater from the Hudson Bay ice dome |
title_short |
Model support for forcing of the 8.2 ka event by meltwater from the Hudson Bay ice dome |
title_full |
Model support for forcing of the 8.2 ka event by meltwater from the Hudson Bay ice dome |
title_fullStr |
Model support for forcing of the 8.2 ka event by meltwater from the Hudson Bay ice dome |
title_full_unstemmed |
Model support for forcing of the 8.2 ka event by meltwater from the Hudson Bay ice dome |
title_sort |
model support for forcing of the 8.2 ka event by meltwater from the hudson bay ice dome |
publisher |
Springer |
publishDate |
2013 |
url |
http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-019-879 https://doi.org/10.1007/s00382-013-1706-z |
geographic |
Hudson Hudson Bay |
geographic_facet |
Hudson Hudson Bay |
genre |
Hudson Bay Ice Sheet North Atlantic |
genre_facet |
Hudson Bay Ice Sheet North Atlantic |
op_relation |
Climate Dynamics http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-019-879 doi:10.1007/s00382-013-1706-z ark:/85065/d7df6s3g |
op_rights |
Copyright 2013 Springer Berlin Heidelberg |
op_doi |
https://doi.org/10.1007/s00382-013-1706-z |
container_title |
Climate Dynamics |
container_volume |
41 |
container_issue |
11-12 |
container_start_page |
2855 |
op_container_end_page |
2873 |
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1776200800764166144 |