Perennial vs. seasonal sea ice in the Northern Hemisphere induced by CO2 changes and tectonic activity during the Miocene
The Cenozoic history of sea ice in the Northern Hemisphere remains poorly constrained. However, several studies indicate that perennial sea ice initiated at least 18‒13 Myrs ago which emphasizes the importance of understanding climate forcings and feedbacks through the Miocene (23‒5 Myrs). In more d...
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ftawi:oai:epic.awi.de:36829 2023-05-15T14:59:14+02:00 Perennial vs. seasonal sea ice in the Northern Hemisphere induced by CO2 changes and tectonic activity during the Miocene Stärz, Michael Jokat, Wilfried Lohmann, Gerrit Knorr, Gregor 2014 https://epic.awi.de/id/eprint/36829/ https://hdl.handle.net/10013/epic.44584 unknown Stärz, M. , Jokat, W. orcid:0000-0002-7793-5854 , Lohmann, G. orcid:0000-0003-2089-733X and Knorr, G. orcid:0000-0002-8317-5046 (2014) Perennial vs. seasonal sea ice in the Northern Hemisphere induced by CO2 changes and tectonic activity during the Miocene , AGU Fall Meeting, San Francisco, 15 December 2014 - 19 December 2014 . hdl:10013/epic.44584 EPIC3AGU Fall Meeting, San Francisco, 2014-12-15-2014-12-19 Conference notRev 2014 ftawi 2021-12-24T15:40:03Z The Cenozoic history of sea ice in the Northern Hemisphere remains poorly constrained. However, several studies indicate that perennial sea ice initiated at least 18‒13 Myrs ago which emphasizes the importance of understanding climate forcings and feedbacks through the Miocene (23‒5 Myrs). In more detail, changes in CO2 might have varied between preindustrial levels (278 parts per million, ppm) and 500 ppm. Furthermore, the control of northward water mass transport by active changes of the Greenland-Scotland Ridge (GSR) sill depth might has affected the actual state of sea ice (perennial vs. seasonal) in the Arctic. Here, we investigate the sensitivity of sea ice to GSR depth and CO2 changes by means of a fully coupled ocean-atmosphere General Circulation Model (GCM) with integrated terrestrial vegetation dynamics (community of earth system models, COSMOS). The model setup comprise a global reconstruction of the mid-Miocene 20‒15 Myrs ago (continental geography, orography, bathymetry, ice-sheet geography and topography) and a change of CO2 levels in the atmosphere. Especially, we additionally integrated a high resolution bathymetric dataset for the northern North Atlantic, GSR, Nordic Seas and the Eurasian Basin. Independently, within the range of CO2 reconstructions and different ocean depth settings of the Greenland-Scotland Seaway the model is capable to reproduce perennial as well as seasonal Arctic ice cover. Based on our results, we conclude that sea ice within the Miocene climate was variable and highly sensitive to different forcings mechanisms. Conference Object Arctic Greenland Greenland-Scotland Ridge Ice Sheet Nordic Seas North Atlantic Sea ice Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Arctic Greenland |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
unknown |
description |
The Cenozoic history of sea ice in the Northern Hemisphere remains poorly constrained. However, several studies indicate that perennial sea ice initiated at least 18‒13 Myrs ago which emphasizes the importance of understanding climate forcings and feedbacks through the Miocene (23‒5 Myrs). In more detail, changes in CO2 might have varied between preindustrial levels (278 parts per million, ppm) and 500 ppm. Furthermore, the control of northward water mass transport by active changes of the Greenland-Scotland Ridge (GSR) sill depth might has affected the actual state of sea ice (perennial vs. seasonal) in the Arctic. Here, we investigate the sensitivity of sea ice to GSR depth and CO2 changes by means of a fully coupled ocean-atmosphere General Circulation Model (GCM) with integrated terrestrial vegetation dynamics (community of earth system models, COSMOS). The model setup comprise a global reconstruction of the mid-Miocene 20‒15 Myrs ago (continental geography, orography, bathymetry, ice-sheet geography and topography) and a change of CO2 levels in the atmosphere. Especially, we additionally integrated a high resolution bathymetric dataset for the northern North Atlantic, GSR, Nordic Seas and the Eurasian Basin. Independently, within the range of CO2 reconstructions and different ocean depth settings of the Greenland-Scotland Seaway the model is capable to reproduce perennial as well as seasonal Arctic ice cover. Based on our results, we conclude that sea ice within the Miocene climate was variable and highly sensitive to different forcings mechanisms. |
format |
Conference Object |
author |
Stärz, Michael Jokat, Wilfried Lohmann, Gerrit Knorr, Gregor |
spellingShingle |
Stärz, Michael Jokat, Wilfried Lohmann, Gerrit Knorr, Gregor Perennial vs. seasonal sea ice in the Northern Hemisphere induced by CO2 changes and tectonic activity during the Miocene |
author_facet |
Stärz, Michael Jokat, Wilfried Lohmann, Gerrit Knorr, Gregor |
author_sort |
Stärz, Michael |
title |
Perennial vs. seasonal sea ice in the Northern Hemisphere induced by CO2 changes and tectonic activity during the Miocene |
title_short |
Perennial vs. seasonal sea ice in the Northern Hemisphere induced by CO2 changes and tectonic activity during the Miocene |
title_full |
Perennial vs. seasonal sea ice in the Northern Hemisphere induced by CO2 changes and tectonic activity during the Miocene |
title_fullStr |
Perennial vs. seasonal sea ice in the Northern Hemisphere induced by CO2 changes and tectonic activity during the Miocene |
title_full_unstemmed |
Perennial vs. seasonal sea ice in the Northern Hemisphere induced by CO2 changes and tectonic activity during the Miocene |
title_sort |
perennial vs. seasonal sea ice in the northern hemisphere induced by co2 changes and tectonic activity during the miocene |
publishDate |
2014 |
url |
https://epic.awi.de/id/eprint/36829/ https://hdl.handle.net/10013/epic.44584 |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Greenland Greenland-Scotland Ridge Ice Sheet Nordic Seas North Atlantic Sea ice |
genre_facet |
Arctic Greenland Greenland-Scotland Ridge Ice Sheet Nordic Seas North Atlantic Sea ice |
op_source |
EPIC3AGU Fall Meeting, San Francisco, 2014-12-15-2014-12-19 |
op_relation |
Stärz, M. , Jokat, W. orcid:0000-0002-7793-5854 , Lohmann, G. orcid:0000-0003-2089-733X and Knorr, G. orcid:0000-0002-8317-5046 (2014) Perennial vs. seasonal sea ice in the Northern Hemisphere induced by CO2 changes and tectonic activity during the Miocene , AGU Fall Meeting, San Francisco, 15 December 2014 - 19 December 2014 . hdl:10013/epic.44584 |
_version_ |
1766331358565629952 |