Pleistocene glacial history of the New Zealand subantarctic islands
| Autor: | E. Rainsley, C. S. M. Turney, N. R. Golledge, J. M. Wilmshurst, M. S. McGlone, A. G. Hogg, B. Li, Z. A. Thomas, R. Roberts, R. T. Jones, J. G. Palmer, V. Flett, G. de Wet, D. K. Hutchinson, M. J. Lipson, P. Fenwick, B. R. Hines, U. Binetti, C. J. Fogwill |
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| Rok vydání: | 2018 |
| Předmět: |
Marine isotope stage
010506 paleontology Pleistocene 010504 meteorology & atmospheric sciences Stratigraphy lcsh:Environmental protection Climate change 010502 geochemistry & geophysics 01 natural sciences Antarctic Cold Reversal lcsh:Environmental pollution lcsh:TD169-171.8 Glacial period 14. Life underwater lcsh:Environmental sciences 0105 earth and related environmental sciences lcsh:GE1-350 GB Global and Planetary Change geography geography.geographical_feature_category Paleontology Glacier Last Glacial Maximum Starvation (glaciology) Oceanography 13. Climate action lcsh:TD172-193.5 Geology |
| Zdroj: | Climate of the Past, Vol 15, Pp 423-448 (2019) |
| ISSN: | 1814-9332 1814-9324 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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