Is the initiation of glaciation on Antarctica related to a change in the structure of the ocean?
Today, the ocean is characterized by pools of warm tropical–subtropical water bounded poleward and at depth by cold water. In the tropics and subtropics, the warm waters are floored at depth by the thermocline–pycnocline, which crops out on the ocean surface between the subtropical and polar frontal...
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Online Access: | https://oceanrep.geomar.de/id/eprint/4557/ https://oceanrep.geomar.de/id/eprint/4557/1/Hay.pdf https://doi.org/10.1016/j.gloplacha.2004.09.005 |
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ftoceanrep:oai:oceanrep.geomar.de:4557 2023-05-15T13:43:38+02:00 Is the initiation of glaciation on Antarctica related to a change in the structure of the ocean? Hay, William W. Flögel, Sascha Söding, Emanuel 2005 text https://oceanrep.geomar.de/id/eprint/4557/ https://oceanrep.geomar.de/id/eprint/4557/1/Hay.pdf https://doi.org/10.1016/j.gloplacha.2004.09.005 en eng Elsevier https://oceanrep.geomar.de/id/eprint/4557/1/Hay.pdf Hay, W. W., Flögel, S. and Söding, E. (2005) Is the initiation of glaciation on Antarctica related to a change in the structure of the ocean?. Global and Planetary Change, 45 (1-3). pp. 23-33. DOI 10.1016/j.gloplacha.2004.09.005 <https://doi.org/10.1016/j.gloplacha.2004.09.005>. doi:10.1016/j.gloplacha.2004.09.005 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2005 ftoceanrep https://doi.org/10.1016/j.gloplacha.2004.09.005 2023-04-07T14:49:51Z Today, the ocean is characterized by pools of warm tropical–subtropical water bounded poleward and at depth by cold water. In the tropics and subtropics, the warm waters are floored at depth by the thermocline–pycnocline, which crops out on the ocean surface between the subtropical and polar frontal systems that form the poleward boundary. It is along and between the frontal systems that the thermocline waters enter the ocean interior. These frontal systems form beneath the maxima of the zonal component of the westerly winds. Today, the location of the westerly winds is stabilized by the persistent high-pressure systems at the polar regions produced by the ice cover of the Antarctic and sea-ice cover of the Arctic. The paleobiogeographic distribution of plankton fossils indicates that, prior to the Oligocene, the subtropical and polar frontal systems were not persistent features. Recent climate model experiments show that without perennial ice cover in the polar regions a seasonal alternation between high and low atmospheric pressure systems can occur. These seasonal alternations would force major changes in the location and strength of the westerly winds, preventing the development of the well-defined frontal systems that characterize the Earth today. Without the subtropical and polar frontal systems, the thermocline would be less well developed and the pycnocline could be dominated by salinity differences. Evidence from ocean drilling suggests that the glaciation of East Antarctica began at the Eocene–Oligocene boundary, but took time to spread over the entire continent. The presence of calcareous nannoplankton in the Arctic basin prior to the Oligocene and their absence thereafter suggests that the ice cover of the Arctic Ocean also developed at the Eocene–Oligocene boundary. Both events appear to be related to the development of the modern oceanic structure, but it remains uncertain whether the ocean changed in response to the development of ice covered polar regions or vice versa. Article in Journal/Newspaper Antarc* Antarctic Antarctica Arctic Basin Arctic Arctic Ocean East Antarctica Sea ice OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Arctic Antarctic The Antarctic Arctic Ocean East Antarctica Global and Planetary Change 45 1-3 23 33 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Today, the ocean is characterized by pools of warm tropical–subtropical water bounded poleward and at depth by cold water. In the tropics and subtropics, the warm waters are floored at depth by the thermocline–pycnocline, which crops out on the ocean surface between the subtropical and polar frontal systems that form the poleward boundary. It is along and between the frontal systems that the thermocline waters enter the ocean interior. These frontal systems form beneath the maxima of the zonal component of the westerly winds. Today, the location of the westerly winds is stabilized by the persistent high-pressure systems at the polar regions produced by the ice cover of the Antarctic and sea-ice cover of the Arctic. The paleobiogeographic distribution of plankton fossils indicates that, prior to the Oligocene, the subtropical and polar frontal systems were not persistent features. Recent climate model experiments show that without perennial ice cover in the polar regions a seasonal alternation between high and low atmospheric pressure systems can occur. These seasonal alternations would force major changes in the location and strength of the westerly winds, preventing the development of the well-defined frontal systems that characterize the Earth today. Without the subtropical and polar frontal systems, the thermocline would be less well developed and the pycnocline could be dominated by salinity differences. Evidence from ocean drilling suggests that the glaciation of East Antarctica began at the Eocene–Oligocene boundary, but took time to spread over the entire continent. The presence of calcareous nannoplankton in the Arctic basin prior to the Oligocene and their absence thereafter suggests that the ice cover of the Arctic Ocean also developed at the Eocene–Oligocene boundary. Both events appear to be related to the development of the modern oceanic structure, but it remains uncertain whether the ocean changed in response to the development of ice covered polar regions or vice versa. |
format |
Article in Journal/Newspaper |
author |
Hay, William W. Flögel, Sascha Söding, Emanuel |
spellingShingle |
Hay, William W. Flögel, Sascha Söding, Emanuel Is the initiation of glaciation on Antarctica related to a change in the structure of the ocean? |
author_facet |
Hay, William W. Flögel, Sascha Söding, Emanuel |
author_sort |
Hay, William W. |
title |
Is the initiation of glaciation on Antarctica related to a change in the structure of the ocean? |
title_short |
Is the initiation of glaciation on Antarctica related to a change in the structure of the ocean? |
title_full |
Is the initiation of glaciation on Antarctica related to a change in the structure of the ocean? |
title_fullStr |
Is the initiation of glaciation on Antarctica related to a change in the structure of the ocean? |
title_full_unstemmed |
Is the initiation of glaciation on Antarctica related to a change in the structure of the ocean? |
title_sort |
is the initiation of glaciation on antarctica related to a change in the structure of the ocean? |
publisher |
Elsevier |
publishDate |
2005 |
url |
https://oceanrep.geomar.de/id/eprint/4557/ https://oceanrep.geomar.de/id/eprint/4557/1/Hay.pdf https://doi.org/10.1016/j.gloplacha.2004.09.005 |
geographic |
Arctic Antarctic The Antarctic Arctic Ocean East Antarctica |
geographic_facet |
Arctic Antarctic The Antarctic Arctic Ocean East Antarctica |
genre |
Antarc* Antarctic Antarctica Arctic Basin Arctic Arctic Ocean East Antarctica Sea ice |
genre_facet |
Antarc* Antarctic Antarctica Arctic Basin Arctic Arctic Ocean East Antarctica Sea ice |
op_relation |
https://oceanrep.geomar.de/id/eprint/4557/1/Hay.pdf Hay, W. W., Flögel, S. and Söding, E. (2005) Is the initiation of glaciation on Antarctica related to a change in the structure of the ocean?. Global and Planetary Change, 45 (1-3). pp. 23-33. DOI 10.1016/j.gloplacha.2004.09.005 <https://doi.org/10.1016/j.gloplacha.2004.09.005>. doi:10.1016/j.gloplacha.2004.09.005 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.gloplacha.2004.09.005 |
container_title |
Global and Planetary Change |
container_volume |
45 |
container_issue |
1-3 |
container_start_page |
23 |
op_container_end_page |
33 |
_version_ |
1766191421304340480 |