Early glacier advance in New Zealand during the Antarctic Cold Reversal
ABSTRACT Glacial landscapes preserve records of past climate change. Investigating the glacier–climate system over the Late Quaternary provides information about past climate change and context for present‐day glacier response to climate warming. Using 28 beryllium‐10 ( 10 Be) surface exposure dates...
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crwiley:10.1002/jqs.3495 2024-06-23T07:46:12+00:00 Early glacier advance in New Zealand during the Antarctic Cold Reversal Tielidze, Levan G. Eaves, Shaun R. Norton, Kevin P. Mackintosh, Andrew N. Pedro, Joel B. Hidy, Alan J. Marsden Fund U.S. Department of Energy Victoria University of Wellington 2023 http://dx.doi.org/10.1002/jqs.3495 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.3495 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/jqs.3495 en eng Wiley http://creativecommons.org/licenses/by/4.0/ http://creativecommons.org/licenses/by/4.0/ Journal of Quaternary Science volume 38, issue 4, page 544-562 ISSN 0267-8179 1099-1417 journal-article 2023 crwiley https://doi.org/10.1002/jqs.3495 2024-06-13T04:20:05Z ABSTRACT Glacial landscapes preserve records of past climate change. Investigating the glacier–climate system over the Late Quaternary provides information about past climate change and context for present‐day glacier response to climate warming. Using 28 beryllium‐10 ( 10 Be) surface exposure dates and snowline reconstructions, we present glacier fluctuations and climate changes for the Antarctic Cold Reversal in the Ahuriri River catchment, Southern Alps of New Zealand (44°7′50″S, 169°38′29″E). Prominent terminal and lateral moraine features from the upper right tributary of the Ahuriri River valley have exposure ages of 14.5 ± 0.3, 13.6 ± 0.3 and 12.6 ± 0.2 ka, suggesting retreat of the glacier during the Antarctic Cold Reversal. Maximum elevation of lateral moraines (MELM) and accumulation area ratio (AAR) suggest snowline elevations at these ages were ≤700, ≤630 and ~360 m lower than today, respectively. This equates to air temperatures ≤3.9, ≤3.5 and 2.3 ± 0.7 °C lower than today (1981–2010), assuming no changes in past precipitation. Ice‐sculpted bedrock surfaces bound by a lateral moraine at nearby Canyon Creek have an age of 13.1 ± 0.3 ka, indicating the moraine correlates with those in the Ahuriri upper right tributary. MELM and AAR reconstructions from the Canyon Creek suggest that snowline elevations at 14.5–13.6 ka were ≤500 or ~380 m lower than today, corresponding to air temperatures ≤2.8 or 2.4 ± 0.7 °C lower than the present‐day (1981–2010). Our results provide insight into the structure of the Antarctic Cold Reversal in the Southern Alps, showing that the largest glacier advance occurred at the start of this interval at c . 14.5 ± 0.3 ka and was followed by gradual retreat. We hypothesize that the early cooling and glacier readvance in New Zealand at the onset of the Antarctic Cold Reversal were triggered by a latitudinal shift of the Southern Hemisphere westerly wind belt. Article in Journal/Newspaper Antarc* Antarctic Wiley Online Library Antarctic New Zealand The Antarctic Journal of Quaternary Science 38 4 544 562 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
ABSTRACT Glacial landscapes preserve records of past climate change. Investigating the glacier–climate system over the Late Quaternary provides information about past climate change and context for present‐day glacier response to climate warming. Using 28 beryllium‐10 ( 10 Be) surface exposure dates and snowline reconstructions, we present glacier fluctuations and climate changes for the Antarctic Cold Reversal in the Ahuriri River catchment, Southern Alps of New Zealand (44°7′50″S, 169°38′29″E). Prominent terminal and lateral moraine features from the upper right tributary of the Ahuriri River valley have exposure ages of 14.5 ± 0.3, 13.6 ± 0.3 and 12.6 ± 0.2 ka, suggesting retreat of the glacier during the Antarctic Cold Reversal. Maximum elevation of lateral moraines (MELM) and accumulation area ratio (AAR) suggest snowline elevations at these ages were ≤700, ≤630 and ~360 m lower than today, respectively. This equates to air temperatures ≤3.9, ≤3.5 and 2.3 ± 0.7 °C lower than today (1981–2010), assuming no changes in past precipitation. Ice‐sculpted bedrock surfaces bound by a lateral moraine at nearby Canyon Creek have an age of 13.1 ± 0.3 ka, indicating the moraine correlates with those in the Ahuriri upper right tributary. MELM and AAR reconstructions from the Canyon Creek suggest that snowline elevations at 14.5–13.6 ka were ≤500 or ~380 m lower than today, corresponding to air temperatures ≤2.8 or 2.4 ± 0.7 °C lower than the present‐day (1981–2010). Our results provide insight into the structure of the Antarctic Cold Reversal in the Southern Alps, showing that the largest glacier advance occurred at the start of this interval at c . 14.5 ± 0.3 ka and was followed by gradual retreat. We hypothesize that the early cooling and glacier readvance in New Zealand at the onset of the Antarctic Cold Reversal were triggered by a latitudinal shift of the Southern Hemisphere westerly wind belt. |
author2 |
Marsden Fund U.S. Department of Energy Victoria University of Wellington |
format |
Article in Journal/Newspaper |
author |
Tielidze, Levan G. Eaves, Shaun R. Norton, Kevin P. Mackintosh, Andrew N. Pedro, Joel B. Hidy, Alan J. |
spellingShingle |
Tielidze, Levan G. Eaves, Shaun R. Norton, Kevin P. Mackintosh, Andrew N. Pedro, Joel B. Hidy, Alan J. Early glacier advance in New Zealand during the Antarctic Cold Reversal |
author_facet |
Tielidze, Levan G. Eaves, Shaun R. Norton, Kevin P. Mackintosh, Andrew N. Pedro, Joel B. Hidy, Alan J. |
author_sort |
Tielidze, Levan G. |
title |
Early glacier advance in New Zealand during the Antarctic Cold Reversal |
title_short |
Early glacier advance in New Zealand during the Antarctic Cold Reversal |
title_full |
Early glacier advance in New Zealand during the Antarctic Cold Reversal |
title_fullStr |
Early glacier advance in New Zealand during the Antarctic Cold Reversal |
title_full_unstemmed |
Early glacier advance in New Zealand during the Antarctic Cold Reversal |
title_sort |
early glacier advance in new zealand during the antarctic cold reversal |
publisher |
Wiley |
publishDate |
2023 |
url |
http://dx.doi.org/10.1002/jqs.3495 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.3495 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/jqs.3495 |
geographic |
Antarctic New Zealand The Antarctic |
geographic_facet |
Antarctic New Zealand The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Journal of Quaternary Science volume 38, issue 4, page 544-562 ISSN 0267-8179 1099-1417 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/jqs.3495 |
container_title |
Journal of Quaternary Science |
container_volume |
38 |
container_issue |
4 |
container_start_page |
544 |
op_container_end_page |
562 |
_version_ |
1802644545345683456 |