Simulated temperature changes as a result of Antarctic ice sheet growth and CO2 reduction
During the Middle Miocene climate transition about 14 million years ago, the Antarctic ice sheet expanded to near-modern volume. Surprisingly, this ice sheet growth was accompanied by a warming in the surface waters of the Southern Ocean, whereas a slight deep-water temperature increase was delayed...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.834687 2023-05-15T14:03:04+02:00 Simulated temperature changes as a result of Antarctic ice sheet growth and CO2 reduction Knorr, Gregor Lohmann, Gerrit 2014-08-06 text/tab-separated-values, 8 data points https://doi.pangaea.de/10.1594/PANGAEA.834687 https://doi.org/10.1594/PANGAEA.834687 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.834687 https://doi.org/10.1594/PANGAEA.834687 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Knorr, Gregor; Lohmann, Gerrit (2014): Climate warming during Antarctic ice sheet expansion at the Middle Miocene transition. Nature Geoscience, 7(5), 376-381, https://doi.org/10.1038/ngeo2119 AWI_PaleoClimate File content File name File size Paleo-climate Dynamics @ AWI Uniform resource locator/link to model result file Dataset 2014 ftpangaea https://doi.org/10.1594/PANGAEA.834687 https://doi.org/10.1038/ngeo2119 2023-01-20T09:03:35Z During the Middle Miocene climate transition about 14 million years ago, the Antarctic ice sheet expanded to near-modern volume. Surprisingly, this ice sheet growth was accompanied by a warming in the surface waters of the Southern Ocean, whereas a slight deep-water temperature increase was delayed by more than 200 thousand years. Here we use a coupled atmosphere-ocean model to assess the relative effects of changes in atmospheric CO2 concentration and ice sheet growth on regional and global temperatures. In the simulations, changes in the wind field associated with the growth of the ice sheet induce changes in ocean circulation, deep-water formation and sea-ice cover that result in sea surface warming and deep-water cooling in large swaths of the Atlantic and Indian ocean sectors of the Southern Ocean. We interpret these changes as the dominant ocean surface response to a 100-thousand-year phase of massive ice growth in Antarctica. A rise in global annual mean temperatures is also seen in response to increased Antarctic ice surface elevation. In contrast, the longer-term surface and deep-water temperature trends are dominated by changes in atmospheric CO2 concentration. We therefore conclude that the climatic and oceanographic impacts of the Miocene expansion of the Antarctic ice sheet are governed by a complex interplay between wind field, ocean circulation and the sea-ice system. Dataset Antarc* Antarctic Antarctica Ice Sheet Sea ice Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Southern Ocean The Antarctic Indian |
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Open Polar |
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PANGAEA - Data Publisher for Earth & Environmental Science |
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ftpangaea |
language |
English |
topic |
AWI_PaleoClimate File content File name File size Paleo-climate Dynamics @ AWI Uniform resource locator/link to model result file |
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AWI_PaleoClimate File content File name File size Paleo-climate Dynamics @ AWI Uniform resource locator/link to model result file Knorr, Gregor Lohmann, Gerrit Simulated temperature changes as a result of Antarctic ice sheet growth and CO2 reduction |
topic_facet |
AWI_PaleoClimate File content File name File size Paleo-climate Dynamics @ AWI Uniform resource locator/link to model result file |
description |
During the Middle Miocene climate transition about 14 million years ago, the Antarctic ice sheet expanded to near-modern volume. Surprisingly, this ice sheet growth was accompanied by a warming in the surface waters of the Southern Ocean, whereas a slight deep-water temperature increase was delayed by more than 200 thousand years. Here we use a coupled atmosphere-ocean model to assess the relative effects of changes in atmospheric CO2 concentration and ice sheet growth on regional and global temperatures. In the simulations, changes in the wind field associated with the growth of the ice sheet induce changes in ocean circulation, deep-water formation and sea-ice cover that result in sea surface warming and deep-water cooling in large swaths of the Atlantic and Indian ocean sectors of the Southern Ocean. We interpret these changes as the dominant ocean surface response to a 100-thousand-year phase of massive ice growth in Antarctica. A rise in global annual mean temperatures is also seen in response to increased Antarctic ice surface elevation. In contrast, the longer-term surface and deep-water temperature trends are dominated by changes in atmospheric CO2 concentration. We therefore conclude that the climatic and oceanographic impacts of the Miocene expansion of the Antarctic ice sheet are governed by a complex interplay between wind field, ocean circulation and the sea-ice system. |
format |
Dataset |
author |
Knorr, Gregor Lohmann, Gerrit |
author_facet |
Knorr, Gregor Lohmann, Gerrit |
author_sort |
Knorr, Gregor |
title |
Simulated temperature changes as a result of Antarctic ice sheet growth and CO2 reduction |
title_short |
Simulated temperature changes as a result of Antarctic ice sheet growth and CO2 reduction |
title_full |
Simulated temperature changes as a result of Antarctic ice sheet growth and CO2 reduction |
title_fullStr |
Simulated temperature changes as a result of Antarctic ice sheet growth and CO2 reduction |
title_full_unstemmed |
Simulated temperature changes as a result of Antarctic ice sheet growth and CO2 reduction |
title_sort |
simulated temperature changes as a result of antarctic ice sheet growth and co2 reduction |
publisher |
PANGAEA |
publishDate |
2014 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.834687 https://doi.org/10.1594/PANGAEA.834687 |
geographic |
Antarctic Southern Ocean The Antarctic Indian |
geographic_facet |
Antarctic Southern Ocean The Antarctic Indian |
genre |
Antarc* Antarctic Antarctica Ice Sheet Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Sea ice Southern Ocean |
op_source |
Supplement to: Knorr, Gregor; Lohmann, Gerrit (2014): Climate warming during Antarctic ice sheet expansion at the Middle Miocene transition. Nature Geoscience, 7(5), 376-381, https://doi.org/10.1038/ngeo2119 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.834687 https://doi.org/10.1594/PANGAEA.834687 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.834687 https://doi.org/10.1038/ngeo2119 |
_version_ |
1766273557703163904 |