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dc.contributor.authorZink, K.
dc.contributor.authorVandergoes, M.
dc.contributor.authorBauersachs, T.
dc.contributor.authorNewnham, R.
dc.contributor.authorRees, A.
dc.contributor.authorSchwark, Lorenz
dc.date.accessioned2017-03-24T11:53:48Z
dc.date.available2017-03-24T11:53:48Z
dc.date.created2017-03-23T06:59:51Z
dc.date.issued2016
dc.identifier.citationZink, K. and Vandergoes, M. and Bauersachs, T. and Newnham, R. and Rees, A. and Schwark, L. 2016. A refined paleotemperature calibration for New Zealand limnic environments using differentiation of branched glycerol dialkyl glycerol tetraether (brGDGT) sources. Journal of Quaternary Science. 31 (7): pp. 823-835.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/51519
dc.identifier.doi10.1002/jqs.2908
dc.description.abstract

Copyright © 2016 John Wiley & Sons, Ltd.Branched glycerol dialkyl glycerol tetraethers (brGDGTs) were abundant in surface sediments of freshwater lakes and in catchment soils at altitudes from 10 to 2020 m in New Zealand. Significant differences in brGDGT compositions between lake sediments and soils indicate sources from separate microbial habitats. An expanded modern calibration dataset comprising 33 lakes has enabled a revised calibration function for determining past mean annual air temperature (MAT) from brGDGTs in New Zealand lake sediments: MAT (°C) = -31.664 × MBTm + 16.252 (n = 30). The function uses a modified methylation index of branched tetraethers (MBTm) that incorporates brGDGT III in the numerator to overcome the lower correlation found between our larger dataset and the unmodified MBT which had been used for previous calibrations. Calibrations combining the cyclization index of branched tetraethers (CBT) and the MBTm or using only certain brGDGTs are possible but have limitations. The revised function shows slightly higher correlation with MAT (R2 = 0.75) than previous calibrations, which were based on nine sites. The refined calibration function is applied to a ~16 000-year lake sediment sequence from northern South Island, New Zealand, and yields temperature reconstructions that are consistent with independently derived climate trends from the same sequence.

dc.publisherJohn Wiley & Sons
dc.titleA refined paleotemperature calibration for New Zealand limnic environments using differentiation of branched glycerol dialkyl glycerol tetraether (brGDGT) sources
dc.typeJournal Article
dcterms.source.volume31
dcterms.source.number7
dcterms.source.startPage823
dcterms.source.endPage835
dcterms.source.issn0267-8179
dcterms.source.titleJournal of Quaternary Science
curtin.departmentDepartment of Chemistry
curtin.accessStatusFulltext not available


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