Heinrich Event Intercomparison with the ice-sheet model SICOPOLIS
Heinrich events (HEs) are large scale surges of the Laurentide Ice Sheet (LIS) over Hudson Bay and Hudson Strait. These surges are thought to be triggered by the internal dynamics of the ice sheet. Therefore it is important to investigate HEs in order to estimate the effect on climate variability. I...
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/28749 2023-08-27T04:09:53+02:00 Heinrich Event Intercomparison with the ice-sheet model SICOPOLIS 氷床モデルSICOPOLISを用いたハインリッヒ・イベントの数値実験およびモデル間相互比較 Takahama, Ryoji 63p. http://hdl.handle.net/2115/28749 eng eng http://hdl.handle.net/2115/28749 北海道大学. 修士(地球環境科学) 450 theses (master) fthokunivhus 2023-08-04T00:06:08Z Heinrich events (HEs) are large scale surges of the Laurentide Ice Sheet (LIS) over Hudson Bay and Hudson Strait. These surges are thought to be triggered by the internal dynamics of the ice sheet. Therefore it is important to investigate HEs in order to estimate the effect on climate variability. It will be tested whether the 3D ice sheet model SICOPOLIS is able to simulate such large scale surges, and what is their sensitivity to change in surface and basal boundary conditions. The model domain is a flat horizontal square. The ice sheet is built up from zero ice thickness over 200 ka, with atemporally constant glacial-climate forcing. The bedrock elevation remains flat throughout the simulations. Further, the geothermal heat flux is applied directly at the bottom of the ice sheet. We could generate many saw-shape oscillations of the ice sheet expressing a series of growth phases and HEs from the standard run. The growth time is about 7 ka, whereas the subsequent HE collapse lasts only for several hundred years. Parameter studies showed that surface temperature affects the ice volume, and surface accumulation affects the periodicity of HEs. Further, the strength of the subglacial sediment affects the amplitude of ice-volume changes. Therefore, surface and basal conditions of the LIS are crucial elements for HEs. Other/Unknown Material Hudson Bay Hudson Strait Ice Sheet Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Hudson Hudson Bay Hudson Strait ENVELOPE(-70.000,-70.000,62.000,62.000) |
institution |
Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
450 |
spellingShingle |
450 Takahama, Ryoji Heinrich Event Intercomparison with the ice-sheet model SICOPOLIS |
topic_facet |
450 |
description |
Heinrich events (HEs) are large scale surges of the Laurentide Ice Sheet (LIS) over Hudson Bay and Hudson Strait. These surges are thought to be triggered by the internal dynamics of the ice sheet. Therefore it is important to investigate HEs in order to estimate the effect on climate variability. It will be tested whether the 3D ice sheet model SICOPOLIS is able to simulate such large scale surges, and what is their sensitivity to change in surface and basal boundary conditions. The model domain is a flat horizontal square. The ice sheet is built up from zero ice thickness over 200 ka, with atemporally constant glacial-climate forcing. The bedrock elevation remains flat throughout the simulations. Further, the geothermal heat flux is applied directly at the bottom of the ice sheet. We could generate many saw-shape oscillations of the ice sheet expressing a series of growth phases and HEs from the standard run. The growth time is about 7 ka, whereas the subsequent HE collapse lasts only for several hundred years. Parameter studies showed that surface temperature affects the ice volume, and surface accumulation affects the periodicity of HEs. Further, the strength of the subglacial sediment affects the amplitude of ice-volume changes. Therefore, surface and basal conditions of the LIS are crucial elements for HEs. |
format |
Other/Unknown Material |
author |
Takahama, Ryoji |
author_facet |
Takahama, Ryoji |
author_sort |
Takahama, Ryoji |
title |
Heinrich Event Intercomparison with the ice-sheet model SICOPOLIS |
title_short |
Heinrich Event Intercomparison with the ice-sheet model SICOPOLIS |
title_full |
Heinrich Event Intercomparison with the ice-sheet model SICOPOLIS |
title_fullStr |
Heinrich Event Intercomparison with the ice-sheet model SICOPOLIS |
title_full_unstemmed |
Heinrich Event Intercomparison with the ice-sheet model SICOPOLIS |
title_sort |
heinrich event intercomparison with the ice-sheet model sicopolis |
url |
http://hdl.handle.net/2115/28749 |
long_lat |
ENVELOPE(-70.000,-70.000,62.000,62.000) |
geographic |
Hudson Hudson Bay Hudson Strait |
geographic_facet |
Hudson Hudson Bay Hudson Strait |
genre |
Hudson Bay Hudson Strait Ice Sheet |
genre_facet |
Hudson Bay Hudson Strait Ice Sheet |
op_relation |
http://hdl.handle.net/2115/28749 北海道大学. 修士(地球環境科学) |
_version_ |
1775351560449032192 |