Mountain glacier chronology from Boulder Lake, New Zealand, indicates MIS 4 and MIS 2 ice advances of similar extent

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dc.contributor.authorMcCarthy, Aen_AU
dc.contributor.authorMackintosh, ANen_AU
dc.contributor.authorRieser, Uen_AU
dc.contributor.authorFink, Den_AU
dc.date.accessioned2009-07-21T06:22:32Zen_AU
dc.date.accessioned2010-04-30T05:04:25Zen_AU
dc.date.available2009-07-21T06:22:32Zen_AU
dc.date.available2010-04-30T05:04:25Zen_AU
dc.date.issued2008-11en_AU
dc.date.statistics2008-11en_AU
dc.description.abstractDating of past glaciation in New Zealand allows Quaternary climatic events to be identified in areas at a great distance from northern hemisphere ice sheets and associated climatic feedbacks. Moreover, climate reconstruction in New Zealand provides insight into the amount of climate change that occurred in the Southwest Pacific where zonal circulation is an important integrator of the climate signal. Boulder Lake is a relatively low-elevation cirque in a range of moderate-relief (similar to 1600 m) mountains in South Island of New Zealand, and it experienced cirque and valley glaciation during the Late Quaternary. Geomorphic mapping. Be-10 and Al-26 exposure. and luminescence dating provide evidence for glacial advances during the Last Glacial Cycle, specifically during Marine Isotope Stage 4 (MIS 4) and Marine Isotope Stage 2 (MIS 2). The MIS 4 advance was fractionally larger and is dated by a former ice-marginal lacustrine deposit (minimum age) with a basal Optically Stimulated Luminescence (OSL) sediment deposition age of 64.9 +/- 10 ka. Paired Be-10 and Al-26 constrain a slightly less extensive MIS 2 glacial advance to 18.2 +/- 1.0 and 17.8 +/- 0.9 ka, coincident with the Last Glacial Maximum (LGM). Glacial equilibrium-line altitudes during both MIS 4 and MIS 2 phases were similar to 960 in lower than the present. This corresponds to a cooling of 5-7 degrees C, taking possible precipitation variability into account. Our findings and a growing number of publications indicate that many temperate valley glaciers reacted differently to the major ice sheets during the Last Glacial Cycle, reaching their Maximum extent during MIS 4 rather than during peak global ice volume during MIS 2. © 2008, Institute of Arctic and Alpine Researchen_AU
dc.identifier.citationMcCarthy, A., Mackintosh, A., Rieser, U., & Fink, D. (2008). Mountain glacier chronology from Boulder Lake, New Zealand, indicates MIS 4 and MIS 2 ice advances of similar extent. Arctic Antarctic and Alpine Research, 40(4), 695-708. doi:10.1657/1523-0430(06-111)[MCCARTHY]2.0.CO;2en_AU
dc.identifier.govdoc1287en_AU
dc.identifier.issn1523-0430en_AU
dc.identifier.issue4en_AU
dc.identifier.journaltitleArctic Antarctic and Alpine Researchen_AU
dc.identifier.pagination695-708en_AU
dc.identifier.urihttp://dx.doi.org/10.1657/1523-0430(06-111)[MCCARTHY]2.0.CO;2en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/1532en_AU
dc.identifier.volume40en_AU
dc.language.isoenen_AU
dc.publisherInstitute of Arctic and Alpine Researchen_AU
dc.subjectNew Zealanden_AU
dc.subjectGlaciersen_AU
dc.subjectQuaternary perioden_AU
dc.subjectSouthern Hemisphereen_AU
dc.subjectIceen_AU
dc.subjectClimatic changeen_AU
dc.titleMountain glacier chronology from Boulder Lake, New Zealand, indicates MIS 4 and MIS 2 ice advances of similar extenten_AU
dc.typeJournal Articleen_AU
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