Millennial-scale periodicities associated with changes in wind ansd precipitation over the last glacial cycle (ca. 117 ± 8.5 ka BP) recorded in sediments from Lake Kai Iwi, Northland, New Zealand

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dc.contributor.authorEvans, Gen_AU
dc.contributor.authorAugustinus, PCen_AU
dc.contributor.authorGadd, PSen_AU
dc.contributor.authorZawadzki, AWen_AU
dc.contributor.authorDitchfield, Aen_AU
dc.contributor.authorHopkins, JLen_AU
dc.date.accessioned2023-06-27T06:01:25Zen_AU
dc.date.available2023-06-27T06:01:25Zen_AU
dc.date.issued2022-01en_AU
dc.date.statistics2023-02-03en_AU
dc.description.abstractMid-latitude Southern Hemisphere proxy records of changing environment, especially those that demonstrate past variability of the South Westerly Winds (SWW), are poorly-constrained prior to the Last Glacial Interglacial Transition (LGIT; ca. 14–11.7 ka BP) and are typically located far enough south or north that they often do not reflect both tropical and SWW signals. With this deficiency in mind, we present a ca. 117 ± 8.5 ka BP lake sediment record from Lake Kai Iwi, Northland, New Zealand (~36°S), located at a latitude that demonstrates changes in precipitation associated with both the northward expansion of the SWW belt and from tropical El Niño Southern Oscillation (ENSO) variability. We converted Lake Kai Iwi μ-XRF proxy data to even time-steps in order to apply Morelet wavelet analysis for identification of millennial-scale periodicities in the data that were likely driven by orbital forcing. The results indicate that Lake Kai Iwi records a ~1 ka periodicity possibly associated with Northern Hemisphere ice sheet dynamics; a ~2–4 ka periodicity associated with ~2.4 ka Hallstatt solar cycles, and a ~9 ka periodicity linked to CO2 outgassing from upwelling in the Southern Ocean driven by changes in intensity and position of the SWW. © 2021 Elsevier B.V.en_AU
dc.description.sponsorshipThe authors would like to thank AINSE Ltd. for providing financial assistance (Award – PGRA 11784) to enable work on this project.en_AU
dc.identifier.articlenumber103688en_AU
dc.identifier.citationEvans, G., Augustinus, P., Gadd, P., Zawadzki, A., Ditchfield, A., & Hopkins, J. (2022). Millennial-scale periodicities associated with changes in wind ansd precipitation over the last glacial cycle (ca. 117 ± 8.5 ka BP) recorded in sediments from Lake Kai Iwi, Northland, New Zealand. Global and Planetary Change, 208, 103688. doi:10.1016/j.gloplacha.2021.103688en_AU
dc.identifier.issn0921-8181en_AU
dc.identifier.journaltitleGlobal and Planetary Changeen_AU
dc.identifier.urihttps://doi.org/10.1016/j.gloplacha.2021.103688en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15069en_AU
dc.identifier.volume208en_AU
dc.language.isoenen_AU
dc.publisherElsevier B. V.en_AU
dc.subjectDataen_AU
dc.subjectSouthern Oscillationen_AU
dc.subjectSouthern Hemisphereen_AU
dc.subjectCarbon dioxideen_AU
dc.subjectWinden_AU
dc.subjectGlaciersen_AU
dc.subjectSolar cycleen_AU
dc.subjectUpwellingen_AU
dc.subjectWave forcesen_AU
dc.titleMillennial-scale periodicities associated with changes in wind ansd precipitation over the last glacial cycle (ca. 117 ± 8.5 ka BP) recorded in sediments from Lake Kai Iwi, Northland, New Zealanden_AU
dc.typeJournal Articleen_AU
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