Pleistocene glacial history of the New Zealand subantarctic islands

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...

Full description

Saved in:
Bibliographic Details
Published in:Climate of the past Vol. 15; no. 2; pp. 423 - 448
Main Authors: Rainsley, Eleanor, Turney, Chris S. M, Golledge, Nicholas R, Wilmshurst, Janet M, McGlone, Matt S, Hogg, Alan G, Li, Bo, Thomas, Zoe A, Roberts, Richard, Jones, Richard T, Palmer, Jonathan G, Flett, Verity, de Wet, Gregory, Hutchinson, David K, Lipson, Mathew J, Fenwick, Pavla, Hines, Ben R, Binetti, Umberto, Fogwill, Christopher J
Format: Journal Article
Language:English
Published: Katlenburg-Lindau Copernicus GmbH 14-03-2019
Copernicus Publications
Subjects:
Air temperature
Analysis
Antarctic convergence
Climate change
Environmental changes
Geomorphology
Glacial periods
Glaciation
Glacier flow
Glaciers
Glaciology
Ice caps
Islands
Isotopes
Last Glacial Maximum
Modelling
Multidisciplinary research
Natural history
Oceans
Paleogeography
Pleistocene
Pleistocene Epoch
Polar environments
Precipitation
Sea ice
Seasonal variations
Seasonality
Surveys
Terrestrial environments
Valley glaciers
Valleys
New Zealand
Auckland Islands
Southern Ocean
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:1814-9332
1814-9324
1814-9332
DOI:10.5194/cp-15-423-2019