Pleistocene glacial history of the New Zealand subantarctic islands

Eleanor Rainsley (Lead / Corresponding author), Chris S. M. Turney, Nicholas R. Golledge, Janet M. Wilmshurst, Matt S. McGlone, Alan G. Hogg, Bo Li, Zoë A. Thomas, Richard Roberts, Richard T. Jones, Jonathan G. Palmer, Verity Flett, Gregory De Wet, David K. Hutchinson, Mathew J. Lipson, Pavla Fenwick, Ben Hines, Umberto Binetti, Christopher J. Fogwill

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Abstract

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.

Original languageEnglish
Pages (from-to)423-448
Number of pages26
JournalClimate of the Past
Volume15
Issue number2
DOIs
Publication statusPublished - 14 Mar 2019

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glacial history
Pleistocene
glaciation
glacier flow
modeling
climatic region
valley glacier
marine isotope stage
ice cap
ocean
sedimentary sequence
starvation
Last Glacial Maximum
seasonality
sea ice
environmental change
glacier
air temperature
valley
climate change

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Rainsley, E., Turney, C. S. M., Golledge, N. R., Wilmshurst, J. M., McGlone, M. S., Hogg, A. G., ... Fogwill, C. J. (2019). Pleistocene glacial history of the New Zealand subantarctic islands. Climate of the Past, 15(2), 423-448. https://doi.org/10.5194/cp-15-423-2019
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 ; De Wet, Gregory ; Hutchinson, David K. ; Lipson, Mathew J. ; Fenwick, Pavla ; Hines, Ben ; Binetti, Umberto ; Fogwill, Christopher J. / Pleistocene glacial history of the New Zealand subantarctic islands. In: Climate of the Past. 2019 ; Vol. 15, No. 2. pp. 423-448.
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Rainsley, E, Turney, CSM, Golledge, NR, Wilmshurst, JM, McGlone, MS, Hogg, AG, Li, B, Thomas, ZA, Roberts, R, Jones, RT, Palmer, JG, Flett, V, De Wet, G, Hutchinson, DK, Lipson, MJ, Fenwick, P, Hines, B, Binetti, U & Fogwill, CJ 2019, 'Pleistocene glacial history of the New Zealand subantarctic islands', Climate of the Past, vol. 15, no. 2, pp. 423-448. https://doi.org/10.5194/cp-15-423-2019

Pleistocene glacial history of the New Zealand subantarctic islands. / Rainsley, Eleanor (Lead / Corresponding author); 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; De Wet, Gregory; Hutchinson, David K.; Lipson, Mathew J.; Fenwick, Pavla; Hines, Ben; Binetti, Umberto; Fogwill, Christopher J.

In: Climate of the Past, Vol. 15, No. 2, 14.03.2019, p. 423-448.

Research output: Contribution to journalArticle

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AU - Flett, Verity

AU - De Wet, Gregory

AU - Hutchinson, David K.

AU - Lipson, Mathew J.

AU - Fenwick, Pavla

AU - Hines, Ben

AU - Binetti, Umberto

AU - Fogwill, Christopher J.

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Rainsley E, Turney CSM, Golledge NR, Wilmshurst JM, McGlone MS, Hogg AG et al. Pleistocene glacial history of the New Zealand subantarctic islands. Climate of the Past. 2019 Mar 14;15(2):423-448. https://doi.org/10.5194/cp-15-423-2019