Pleistocene glacial history of the New Zealand subantarctic islands
The New Zealand subantarctic islands of Auckland and Campbell, situated between the subtropical front and the Antarctic Convergence in the Pacific sector of the Southern Ocean, provide valuable terrestrial records from a globally important climatic region. Whilst the islands show clear evidence of p...
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ftcopernicus:oai:publications.copernicus.org:cp68713 2023-05-15T13:55:28+02:00 Pleistocene glacial history of the New Zealand subantarctic islands Rainsley, Eleanor Turney, Chris S. M. Golledge, Nicholas R. Wilmshurst, Janet M. McGlone, Matt S. Hogg, Alan G. Li, Bo Thomas, Zoë A. Roberts, Richard Jones, Richard T. Palmer, Jonathan G. Flett, Verity Wet, Gregory Hutchinson, David K. Lipson, Mathew J. Fenwick, Pavla Hines, Ben R. Binetti, Umberto Fogwill, Christopher J. 2019-03-14 application/pdf https://doi.org/10.5194/cp-15-423-2019 https://cp.copernicus.org/articles/15/423/2019/ eng eng doi:10.5194/cp-15-423-2019 https://cp.copernicus.org/articles/15/423/2019/ eISSN: 1814-9332 Text 2019 ftcopernicus https://doi.org/10.5194/cp-15-423-2019 2020-07-20T16:22:54Z The New Zealand subantarctic islands of Auckland and Campbell, situated between the subtropical front and the Antarctic Convergence in the Pacific sector of the Southern Ocean, provide valuable terrestrial records from a globally important climatic region. Whilst the islands show clear evidence of past glaciation, the timing and mechanisms behind Pleistocene environmental and climate changes remain uncertain. Here we present a multidisciplinary study of the islands – including marine and terrestrial geomorphological surveys, extensive analyses of sedimentary sequences, a comprehensive dating programme, and glacier flow line modelling – to investigate multiple phases of glaciation across the islands. We find evidence that the Auckland Islands hosted a small ice cap 384 000 ± 26 000 years ago ( 384±26 ka), most likely during Marine Isotope Stage 10, a period when the subtropical front was reportedly north of its present-day latitude by several degrees, and consistent with hemispheric-wide glacial expansion. Flow line modelling constrained by field evidence suggests a more restricted glacial period prior to the LGM that formed substantial valley glaciers on the Campbell and Auckland Islands around 72–62 ka. Despite previous interpretations that suggest the maximum glacial extent occurred in the form of valley glaciation at the Last Glacial Maximum (LGM; ∼21 ka), our combined approach suggests minimal LGM glaciation across the New Zealand subantarctic islands and that no glaciers were present during the Antarctic Cold Reversal (ACR; ∼15 –13 ka). Instead, modelling implies that despite a regional mean annual air temperature depression of ∼5 ∘ C during the LGM, a combination of high seasonality and low precipitation left the islands incapable of sustaining significant glaciation. We suggest that northwards expansion of winter sea ice during the LGM and subsequent ACR led to precipitation starvation across the middle to high latitudes of the Southern Ocean, resulting in restricted glaciation of the subantarctic islands. Text Antarc* Antarctic Auckland Islands Ice cap Sea ice Southern Ocean Copernicus Publications: E-Journals Antarctic New Zealand Pacific Southern Ocean The Antarctic Climate of the Past 15 2 423 448 |
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Open Polar |
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Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
The New Zealand subantarctic islands of Auckland and Campbell, situated between the subtropical front and the Antarctic Convergence in the Pacific sector of the Southern Ocean, provide valuable terrestrial records from a globally important climatic region. Whilst the islands show clear evidence of past glaciation, the timing and mechanisms behind Pleistocene environmental and climate changes remain uncertain. Here we present a multidisciplinary study of the islands – including marine and terrestrial geomorphological surveys, extensive analyses of sedimentary sequences, a comprehensive dating programme, and glacier flow line modelling – to investigate multiple phases of glaciation across the islands. We find evidence that the Auckland Islands hosted a small ice cap 384 000 ± 26 000 years ago ( 384±26 ka), most likely during Marine Isotope Stage 10, a period when the subtropical front was reportedly north of its present-day latitude by several degrees, and consistent with hemispheric-wide glacial expansion. Flow line modelling constrained by field evidence suggests a more restricted glacial period prior to the LGM that formed substantial valley glaciers on the Campbell and Auckland Islands around 72–62 ka. Despite previous interpretations that suggest the maximum glacial extent occurred in the form of valley glaciation at the Last Glacial Maximum (LGM; ∼21 ka), our combined approach suggests minimal LGM glaciation across the New Zealand subantarctic islands and that no glaciers were present during the Antarctic Cold Reversal (ACR; ∼15 –13 ka). Instead, modelling implies that despite a regional mean annual air temperature depression of ∼5 ∘ C during the LGM, a combination of high seasonality and low precipitation left the islands incapable of sustaining significant glaciation. We suggest that northwards expansion of winter sea ice during the LGM and subsequent ACR led to precipitation starvation across the middle to high latitudes of the Southern Ocean, resulting in restricted glaciation of the subantarctic islands. |
format |
Text |
author |
Rainsley, Eleanor Turney, Chris S. M. Golledge, Nicholas R. Wilmshurst, Janet M. McGlone, Matt S. Hogg, Alan G. Li, Bo Thomas, Zoë A. Roberts, Richard Jones, Richard T. Palmer, Jonathan G. Flett, Verity Wet, Gregory Hutchinson, David K. Lipson, Mathew J. Fenwick, Pavla Hines, Ben R. Binetti, Umberto Fogwill, Christopher J. |
spellingShingle |
Rainsley, Eleanor Turney, Chris S. M. Golledge, Nicholas R. Wilmshurst, Janet M. McGlone, Matt S. Hogg, Alan G. Li, Bo Thomas, Zoë A. Roberts, Richard Jones, Richard T. Palmer, Jonathan G. Flett, Verity Wet, Gregory Hutchinson, David K. Lipson, Mathew J. Fenwick, Pavla Hines, Ben R. Binetti, Umberto Fogwill, Christopher J. Pleistocene glacial history of the New Zealand subantarctic islands |
author_facet |
Rainsley, Eleanor Turney, Chris S. M. Golledge, Nicholas R. Wilmshurst, Janet M. McGlone, Matt S. Hogg, Alan G. Li, Bo Thomas, Zoë A. Roberts, Richard Jones, Richard T. Palmer, Jonathan G. Flett, Verity Wet, Gregory Hutchinson, David K. Lipson, Mathew J. Fenwick, Pavla Hines, Ben R. Binetti, Umberto Fogwill, Christopher J. |
author_sort |
Rainsley, Eleanor |
title |
Pleistocene glacial history of the New Zealand subantarctic islands |
title_short |
Pleistocene glacial history of the New Zealand subantarctic islands |
title_full |
Pleistocene glacial history of the New Zealand subantarctic islands |
title_fullStr |
Pleistocene glacial history of the New Zealand subantarctic islands |
title_full_unstemmed |
Pleistocene glacial history of the New Zealand subantarctic islands |
title_sort |
pleistocene glacial history of the new zealand subantarctic islands |
publishDate |
2019 |
url |
https://doi.org/10.5194/cp-15-423-2019 https://cp.copernicus.org/articles/15/423/2019/ |
geographic |
Antarctic New Zealand Pacific Southern Ocean The Antarctic |
geographic_facet |
Antarctic New Zealand Pacific Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Auckland Islands Ice cap Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Auckland Islands Ice cap Sea ice Southern Ocean |
op_source |
eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-15-423-2019 https://cp.copernicus.org/articles/15/423/2019/ |
op_doi |
https://doi.org/10.5194/cp-15-423-2019 |
container_title |
Climate of the Past |
container_volume |
15 |
container_issue |
2 |
container_start_page |
423 |
op_container_end_page |
448 |
_version_ |
1766262116673650688 |