Plausible Last Interglacial Antarctic Ice Sheet Changes Do Not Fully Explain Antarctic Ice Core Water Isotope Records
Abstract Antarctic ice cores can help determine ice mass loss from the Antarctic Ice Sheet (AIS) during past warm periods. We compile Last Interglacial (LIG) δ18O measurements from eight Antarctic cores and compare these to new isotope‐enabled LIG simulations, which explore three plausible LIG AIS e...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2025-01-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2024GL110657 |
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| author | Huiling Zou Louise C. Sime Nancy A. N. Bertler Elizabeth D. Keller Eric W. Wolff |
| author_facet | Huiling Zou Louise C. Sime Nancy A. N. Bertler Elizabeth D. Keller Eric W. Wolff |
| author_sort | Huiling Zou |
| collection | DOAJ |
| description | Abstract Antarctic ice cores can help determine ice mass loss from the Antarctic Ice Sheet (AIS) during past warm periods. We compile Last Interglacial (LIG) δ18O measurements from eight Antarctic cores and compare these to new isotope‐enabled LIG simulations, which explore three plausible LIG AIS elevation and extent scenarios. We find that these simulations capture less than 10% of East Antarctic core‐mean δ18O changes. Although our simulations do not fully explain the changes, they capture some inter‐core geographical δ18O variations. Some LIG AIS configurations show higher skill than PI AIS configurations in simulating the inter‐core differences. The remaining discrepancies between the simulated and observed core‐mean water isotope changes suggest that LIG simulations also need to include the influences of reduced Antarctic sea ice, a warmer Southern Ocean, and resultant shifts in vapor source regions to produce a more satisfactory match to δ18O observed at ice core sites. |
| format | Article |
| id | doaj-art-56ea318ed34d45a3a43e26fdbe327254 |
| institution | Kabale University |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-56ea318ed34d45a3a43e26fdbe3272542025-01-20T13:05:57ZengWileyGeophysical Research Letters0094-82761944-80072025-01-01521n/an/a10.1029/2024GL110657Plausible Last Interglacial Antarctic Ice Sheet Changes Do Not Fully Explain Antarctic Ice Core Water Isotope RecordsHuiling Zou0Louise C. Sime1Nancy A. N. Bertler2Elizabeth D. Keller3Eric W. Wolff4Antarctic Research Centre Victoria University of Wellington Wellington New ZealandBritish Antarctic Survey Cambridge UKAntarctic Research Centre Victoria University of Wellington Wellington New ZealandAntarctic Research Centre Victoria University of Wellington Wellington New ZealandDepartment of Earth Sciences University of Cambridge Cambridge UKAbstract Antarctic ice cores can help determine ice mass loss from the Antarctic Ice Sheet (AIS) during past warm periods. We compile Last Interglacial (LIG) δ18O measurements from eight Antarctic cores and compare these to new isotope‐enabled LIG simulations, which explore three plausible LIG AIS elevation and extent scenarios. We find that these simulations capture less than 10% of East Antarctic core‐mean δ18O changes. Although our simulations do not fully explain the changes, they capture some inter‐core geographical δ18O variations. Some LIG AIS configurations show higher skill than PI AIS configurations in simulating the inter‐core differences. The remaining discrepancies between the simulated and observed core‐mean water isotope changes suggest that LIG simulations also need to include the influences of reduced Antarctic sea ice, a warmer Southern Ocean, and resultant shifts in vapor source regions to produce a more satisfactory match to δ18O observed at ice core sites.https://doi.org/10.1029/2024GL110657last interglacialwater isotopeice coresisotope‐enabled modelAntarctic ice sheetelevation changes |
| spellingShingle | Huiling Zou Louise C. Sime Nancy A. N. Bertler Elizabeth D. Keller Eric W. Wolff Plausible Last Interglacial Antarctic Ice Sheet Changes Do Not Fully Explain Antarctic Ice Core Water Isotope Records Geophysical Research Letters last interglacial water isotope ice cores isotope‐enabled model Antarctic ice sheet elevation changes |
| title | Plausible Last Interglacial Antarctic Ice Sheet Changes Do Not Fully Explain Antarctic Ice Core Water Isotope Records |
| title_full | Plausible Last Interglacial Antarctic Ice Sheet Changes Do Not Fully Explain Antarctic Ice Core Water Isotope Records |
| title_fullStr | Plausible Last Interglacial Antarctic Ice Sheet Changes Do Not Fully Explain Antarctic Ice Core Water Isotope Records |
| title_full_unstemmed | Plausible Last Interglacial Antarctic Ice Sheet Changes Do Not Fully Explain Antarctic Ice Core Water Isotope Records |
| title_short | Plausible Last Interglacial Antarctic Ice Sheet Changes Do Not Fully Explain Antarctic Ice Core Water Isotope Records |
| title_sort | plausible last interglacial antarctic ice sheet changes do not fully explain antarctic ice core water isotope records |
| topic | last interglacial water isotope ice cores isotope‐enabled model Antarctic ice sheet elevation changes |
| url | https://doi.org/10.1029/2024GL110657 |
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