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Ice sheet-free West Antarctica during peak early Oligocene glaciation.

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Title: Ice sheet-free West Antarctica during peak early Oligocene glaciation.
Authors: Klages, J. P., Hillenbrand, C.-D., Bohaty, S. M., Salzmann, U., Bickert, T., Lohmann, G., Knahl, H. S., Gierz, P., Niu, L., Titschack, J., Kuhn, G., Frederichs, T., Müller, J., Bauersachs, T., Larter, R. D., Hochmuth, K., Ehrmann, W., Nehrke, G., Rodríguez-Tovar, F. J., Schmiedl, G.
Source: Science (pre-March 2025). 7/19/2024, Vol. 385 Issue 6706, p322-327. 6p. 1 Color Photograph, 3 Diagrams.
Subjects: Antarctic ice, Oligocene Epoch, Ice sheets, Climate change, Ocean temperature
Geographic Terms: Antarctica
Abstract: One of Earth’s most fundamental climate shifts, the greenhouse-icehouse transition 34 million years ago, initiated Antarctic ice sheet buildup, influencing global climate until today. However, the extent of the ice sheet during the Early Oligocene Glacial Maximum (~33.7 to 33.2 million years ago) that immediately followed this transition—a critical knowledge gap for assessing feedbacks between permanently glaciated areas and early Cenozoic global climate reorganization—is uncertain. In this work, we present shallow-marine drilling data constraining earliest Oligocene environmental conditions on West Antarctica’s Pacific margin—a key region for understanding Antarctic ice sheet evolution. These data indicate a cool-temperate environment with mild ocean and air temperatures that prevented West Antarctic Ice Sheet formation. Climate–ice sheet modeling corroborates a highly asymmetric Antarctic ice sheet, thereby revealing its differential regional response to past and future climatic change. [ABSTRACT FROM AUTHOR]
Copyright of Science (pre-March 2025) is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: Ice sheet-free West Antarctica during peak early Oligocene glaciation.
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  Data: <searchLink fieldCode="AR" term="%22Klages%2C+J%2E+P%2E%22">Klages, J. P.</searchLink><br /><searchLink fieldCode="AR" term="%22Hillenbrand%2C+C%2E-D%2E%22">Hillenbrand, C.-D.</searchLink><br /><searchLink fieldCode="AR" term="%22Bohaty%2C+S%2E+M%2E%22">Bohaty, S. M.</searchLink><br /><searchLink fieldCode="AR" term="%22Salzmann%2C+U%2E%22">Salzmann, U.</searchLink><br /><searchLink fieldCode="AR" term="%22Bickert%2C+T%2E%22">Bickert, T.</searchLink><br /><searchLink fieldCode="AR" term="%22Lohmann%2C+G%2E%22">Lohmann, G.</searchLink><br /><searchLink fieldCode="AR" term="%22Knahl%2C+H%2E+S%2E%22">Knahl, H. S.</searchLink><br /><searchLink fieldCode="AR" term="%22Gierz%2C+P%2E%22">Gierz, P.</searchLink><br /><searchLink fieldCode="AR" term="%22Niu%2C+L%2E%22">Niu, L.</searchLink><br /><searchLink fieldCode="AR" term="%22Titschack%2C+J%2E%22">Titschack, J.</searchLink><br /><searchLink fieldCode="AR" term="%22Kuhn%2C+G%2E%22">Kuhn, G.</searchLink><br /><searchLink fieldCode="AR" term="%22Frederichs%2C+T%2E%22">Frederichs, T.</searchLink><br /><searchLink fieldCode="AR" term="%22Müller%2C+J%2E%22">Müller, J.</searchLink><br /><searchLink fieldCode="AR" term="%22Bauersachs%2C+T%2E%22">Bauersachs, T.</searchLink><br /><searchLink fieldCode="AR" term="%22Larter%2C+R%2E+D%2E%22">Larter, R. D.</searchLink><br /><searchLink fieldCode="AR" term="%22Hochmuth%2C+K%2E%22">Hochmuth, K.</searchLink><br /><searchLink fieldCode="AR" term="%22Ehrmann%2C+W%2E%22">Ehrmann, W.</searchLink><br /><searchLink fieldCode="AR" term="%22Nehrke%2C+G%2E%22">Nehrke, G.</searchLink><br /><searchLink fieldCode="AR" term="%22Rodríguez-Tovar%2C+F%2E+J%2E%22">Rodríguez-Tovar, F. J.</searchLink><br /><searchLink fieldCode="AR" term="%22Schmiedl%2C+G%2E%22">Schmiedl, G.</searchLink>
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  Data: <searchLink fieldCode="JN" term="%22Science+%28pre-March+2025%29%22">Science (pre-March 2025)</searchLink>. 7/19/2024, Vol. 385 Issue 6706, p322-327. 6p. 1 Color Photograph, 3 Diagrams.
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  Data: <searchLink fieldCode="DE" term="%22Antarctic+ice%22">Antarctic ice</searchLink><br /><searchLink fieldCode="DE" term="%22Oligocene+Epoch%22">Oligocene Epoch</searchLink><br /><searchLink fieldCode="DE" term="%22Ice+sheets%22">Ice sheets</searchLink><br /><searchLink fieldCode="DE" term="%22Climate+change%22">Climate change</searchLink><br /><searchLink fieldCode="DE" term="%22Ocean+temperature%22">Ocean temperature</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22Antarctica%22">Antarctica</searchLink>
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  Data: One of Earth’s most fundamental climate shifts, the greenhouse-icehouse transition 34 million years ago, initiated Antarctic ice sheet buildup, influencing global climate until today. However, the extent of the ice sheet during the Early Oligocene Glacial Maximum (~33.7 to 33.2 million years ago) that immediately followed this transition—a critical knowledge gap for assessing feedbacks between permanently glaciated areas and early Cenozoic global climate reorganization—is uncertain. In this work, we present shallow-marine drilling data constraining earliest Oligocene environmental conditions on West Antarctica’s Pacific margin—a key region for understanding Antarctic ice sheet evolution. These data indicate a cool-temperate environment with mild ocean and air temperatures that prevented West Antarctic Ice Sheet formation. Climate–ice sheet modeling corroborates a highly asymmetric Antarctic ice sheet, thereby revealing its differential regional response to past and future climatic change. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Science (pre-March 2025) is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=pbh&AN=178496698
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        Value: 10.1126/science.adj3931
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        Text: English
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        PageCount: 6
        StartPage: 322
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      – SubjectFull: Antarctic ice
        Type: general
      – SubjectFull: Oligocene Epoch
        Type: general
      – SubjectFull: Ice sheets
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      – SubjectFull: Climate change
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      – SubjectFull: Ocean temperature
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      – SubjectFull: Antarctica
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