The early rise and late demise of New Zealand’s last glacial maximum

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dc.contributor.authorRother, Hen_AU
dc.contributor.authorFink, Den_AU
dc.contributor.authorShulmeister, Jen_AU
dc.contributor.authorMifsud, Cen_AU
dc.contributor.authorEvans, Men_AU
dc.contributor.authorPugh, Jen_AU
dc.date.accessioned2016-10-24T23:42:24Zen_AU
dc.date.available2016-10-24T23:42:24Zen_AU
dc.date.issued2014-06-13en_AU
dc.date.statistics2016-11-25en_AU
dc.description.abstractRecent debate on records of southern midlatitude glaciation has focused on reconstructing glacier dynamics during the last glacial termination, with different results supporting both in-phase and out-of-phase correlations with Northern Hemisphere glacial signals. A continuing major weakness in this debate is the lack of robust data, particularly from the early and maximum phase of southern midlatitude glaciation (∼30–20 ka), to verify the competing models. Here we present a suite of 58 cosmogenic exposure ages from 17 last-glacial ice limits in the Rangitata Valley of New Zealand, capturing an extensive record of glacial oscillations between 28–16 ka. The sequence shows that the local last glacial maximum in this region occurred shortly before 28 ka, followed by several successively less extensive ice readvances between 26–19 ka. The onset of Termination 1 and the ensuing glacial retreat is preserved in exceptional detail through numerous recessional moraines, indicating that ice retreat between 19–16 ka was very gradual. Extensive valley glaciers survived in the Rangitata catchment until at least 15.8 ka. These findings preclude the previously inferred rapid climate-driven ice retreat in the Southern Alps after the onset of Termination 1. Our record documents an early last glacial maximum, an overall trend of diminishing ice volume in New Zealand between 28–20 ka, and gradual deglaciation until at least 15 ka. © 2014, National Academy of Sciences of the United States of America.en_AU
dc.identifier.citationRother, H., Fink, D., Shulmeister, J., Mifsud, C., Evans, M., & Pugh, J. (2014). The early rise and late demise of New Zealand's last glacial maximum. Proceedings of the National Academy of Sciences, 111(32), 11630-11635. doi:10.1073/pnas.1401547111en_AU
dc.identifier.govdoc7400en_AU
dc.identifier.issn1091-6490en_AU
dc.identifier.issue32en_AU
dc.identifier.journaltitleProceedings of the National Academy of Sciencesen_AU
dc.identifier.pagination11630-11635en_AU
dc.identifier.urihttps://doi.org/10.1073/pnas.1401547111en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/7878en_AU
dc.identifier.volume111en_AU
dc.language.isoenen_AU
dc.publisherProceedings of the National Academy of Sciences of the United States of Americaen_AU
dc.subjectGlaciersen_AU
dc.subjectIceen_AU
dc.subjectNorthern Hemisphereen_AU
dc.subjectDataen_AU
dc.subjectMorainesen_AU
dc.subjectClimatesen_AU
dc.titleThe early rise and late demise of New Zealand’s last glacial maximumen_AU
dc.typeJournal Articleen_AU
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