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Late Quaternary Climate Variability and Change from Aotearoa New Zealand Speleothems: Progress in Age Modelling, Oxygen Isotope Master Record Construction and Proxy-Model Comparisons

1
National Institute of Water and Atmospheric Research Ltd., Auckland 1010, New Zealand
2
School of Environment, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
3
Environmental Research Institute, School of Science, University of Waikato, Hamilton 3240, New Zealand
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School of Earth and Environmental Sciences, University of Queensland, Brisbane 4072, Australia
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School of Geography, Environment and Earth Sciences, Victoria University Wellington, Wellington 6140, New Zealand
6
Department of Geoscience, University of Nevada Las Vegas, Las Vegas, NV 89154, USA
*
Author to whom correspondence should be addressed.
Received: 19 July 2019 / Revised: 31 July 2020 / Accepted: 7 August 2020 / Published: 16 August 2020
We re-evaluated speleothem isotope series from Aotearoa New Zealand that were recently contributed to the Speleothem Isotopes Synthesis and AnaLysis (SISAL) database. COnstructing Proxy Records from Age Models (COPRA) software was used to produce Bayesian age models for those speleothems. The new age modelling helped us examine Late Quaternary temporal coverage for the national speleothem network, and also supported our exploration of three different isotope master record generation techniques using Holocene δ18O data from Waitomo. We then applied the output from one of the isotope master record techniques to test an application case of how climate transfer functions can be developed using climate model simulated temperatures. Our results suggest Holocene δ18O trends at Waitomo capture air temperature variations weighted toward the primary season of soil moisture (and epikarst) recharge during winter. This interpretation is consistent with the latest monitoring data from the Waitomo region. Holocene δ18O millennial-scale trends and centennial-scale variability at Waitomo likely reflect atmospheric circulation patterns that concomitantly vary with surface water temperature and the isotopic composition of the Tasman Sea. A climate model simulation context for the Holocene millennial-scale trends in the Waitomo δ18O isotope master record suggest that site is sensitive to changes in the subtropical front (STF) and the Tasman Front. Our comparison of isotope master record techniques using Waitomo δ18O data indicate that caution is needed prior to merging δ18O data series from different caves in order to avoid time series artefacts. Future work should incorporate more high-resolution cave monitoring and climate calibration studies, and develop new speleothem data from northern and eastern regions of the country. View Full-Text
Keywords: New Zealand; speleothems; age model; δ18O isotope master record; palaeoclimate; atmospheric regimes; proxy-model comparison; temperature reconstruction New Zealand; speleothems; age model; δ18O isotope master record; palaeoclimate; atmospheric regimes; proxy-model comparison; temperature reconstruction
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MDPI and ACS Style

Lorrey, A.M.; Williams, P.W.; Woolley, J.-M.; Fauchereau, N.C.; Hartland, A.; Bostock, H.; Eaves, S.; Lachniet, M.S.; Renwick, J.A.; Varma, V. Late Quaternary Climate Variability and Change from Aotearoa New Zealand Speleothems: Progress in Age Modelling, Oxygen Isotope Master Record Construction and Proxy-Model Comparisons. Quaternary 2020, 3, 24. https://0-doi-org.brum.beds.ac.uk/10.3390/quat3030024

AMA Style

Lorrey AM, Williams PW, Woolley J-M, Fauchereau NC, Hartland A, Bostock H, Eaves S, Lachniet MS, Renwick JA, Varma V. Late Quaternary Climate Variability and Change from Aotearoa New Zealand Speleothems: Progress in Age Modelling, Oxygen Isotope Master Record Construction and Proxy-Model Comparisons. Quaternary. 2020; 3(3):24. https://0-doi-org.brum.beds.ac.uk/10.3390/quat3030024

Chicago/Turabian Style

Lorrey, Andrew M., Paul W. Williams, John-Mark Woolley, Nicolas C. Fauchereau, Adam Hartland, Helen Bostock, Shaun Eaves, Matthew S. Lachniet, James A. Renwick, and Vidya Varma. 2020. "Late Quaternary Climate Variability and Change from Aotearoa New Zealand Speleothems: Progress in Age Modelling, Oxygen Isotope Master Record Construction and Proxy-Model Comparisons" Quaternary 3, no. 3: 24. https://0-doi-org.brum.beds.ac.uk/10.3390/quat3030024

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