The scientific value and potential of New Zealand swamp kauri

Lorrey, Andrew; Boswijk, Gretel; Hogg, Alan G.; Palmer, Jonathan; Turney, Chris S. M.; Fowler, Anthony; Ogden, John C.; Woolley, John-Mark

doi:10.1016/j.quascirev.2017.12.019

Cited by 22 publications

(15 citation statements)

References 63 publications

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“…Thermoluminescene ages existing for the older ridges of One Tree Point barrier are ∼115 ± 19, ∼92 ± 19 and ∼85 ± 8 ka (Nichol, ) and recent conventional radiocarbon ages of Kauri swamps deposited above these ridges are >49,809, >51,293, and >51,969 14 C a BP (Wk‐ numbers 24,878–24,880) in Lorrey et al . (). This inner part of the composite system represents MIS 5e but is simply referred to throughout this paper as the Pleistocene barrier.…”

Section: Regional Settingmentioning

confidence: 97%

Prograded coastal barriers provide paleoenvironmental records of storms and sea level during late Quaternary highstands

Dougherty

2018

J Quaternary Science

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Records of past shoreline evolution, storm impacts, and variations in sea level are essential to accurately assess the vulnerability of beaches to future climate change. Prograded sandy barriers provide the opportunity to utilize our understanding of coastal dynamics documented over decades to determine storm impacts over centuries and sea‐level change over millennia. Composite coastal barriers that have prograded throughout the Pleistocene and Holocene maintain, within their stratigraphy, a record of shoreline evolution extending back to when sea level was known to be higher than today (Marine Isotope Stage or MIS 5e), including high‐energy events during these late Quaternary highstands. This study utilizes ground‐penetrating radar to image the facies architecture of a composite barrier system in Bream Bay, New Zealand. The resulting stratigraphic record mapped paleo‐beachfaces with decimeter resolution spanning ∼5 kilometers from the active shoreline, bridging timescales of coastal evolution over orders of magnitude. Charting the elevation of the beachfaces provides evidence of overall sea‐level falls from +5 to +2 m above present in the Pleistocene and from a ∼2‐m mid‐Holocene highstand. Sixty paleo‐beachfaces with distinct storm‐related signatures are identified within the Pleistocene morphostratigraphy. In the past ∼6,000 years 25 major storm events were recorded, giving an average period between events of ∼230 years. These unprecedented data provide insight, as well as input to forecasting models, needed to mitigate and manage future impacts of global warming.

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Section: Regional Settingmentioning

confidence: 97%

Prograded coastal barriers provide paleoenvironmental records of storms and sea level during late Quaternary highstands

Dougherty

2018

J Quaternary Science

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“…In this study, we performed detailed radiocarbon analyses of ancient kauri (Agathis australis) trees preserved in northern New Zealand wetlands (24) to generate a contiguous reconstruction of atmospheric 14 C across the Laschamps (see supplementary materials). We compared a series of radiocarbon measurements across multiple kauri trunk cross sections to identify variations in atmospheric radiocarbon at a highly resolved level.…”

Section: Radiocarbon Changes Across the Laschampsmentioning

confidence: 99%

A global environmental crisis 42,000 years ago

Cooper

Turney

Palmer

et al. 2021

Science

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Geological archives record multiple reversals of Earth’s magnetic poles, but the global impacts of these events, if any, remain unclear. Uncertain radiocarbon calibration has limited investigation of the potential effects of the last major magnetic inversion, known as the Laschamps Excursion [41 to 42 thousand years ago (ka)]. We use ancient New Zealand kauri trees (Agathis australis) to develop a detailed record of atmospheric radiocarbon levels across the Laschamps Excursion. We precisely characterize the geomagnetic reversal and perform global chemistry-climate modeling and detailed radiocarbon dating of paleoenvironmental records to investigate impacts. We find that geomagnetic field minima ~42 ka, in combination with Grand Solar Minima, caused substantial changes in atmospheric ozone concentration and circulation, driving synchronous global climate shifts that caused major environmental changes, extinction events, and transformations in the archaeological record.

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“…Lorrey et al. (2016, 2018) also found a correlation between δ 18 O cel and the SOI indicating that kauri δ 18 O cel may be a useful proxy of past ENSO conditions. While both δ 18 O cel and δ 13 C cel in kauri tend to be similarly sensitive to the above‐mentioned climate variables, age‐related offsets as well as divergences in microclimate conditions can introduce complexities into the δ 13 C cel record (Brookman, 2014) as described in other Late Glacial records (Pauly et al., 2020).…”

Section: Introductionmentioning

confidence: 94%

“…The sensitivity of kauri to summer season (November-February; NDJF) hydroclimate indices have been further explored through stable isotope analysis of modern kauri cellulose (e.g., Brookman, 2014;Lorrey et al, 2016;supporting information S1). Brookman (2014) Lorrey et al (2016Lorrey et al ( , 2018 also found a correlation between δ 18 O cel and the SOI indicating that kauri δ 18 O cel may be a useful proxy of past ENSO conditions. While both δ 18 O cel and δ 13 C cel in kauri tend to be similarly sensitive to the above-mentioned climate variables, age-related offsets as well as divergences in microclimate conditions can introduce complexities into the δ 13 C cel record (Brookman, 2014) as described in other Late Glacial records (Pauly et al, 2020).…”

Section: 1029/2020gl090299mentioning

confidence: 99%

Kauri Tree‐Ring Stable Isotopes Reveal a Centennial Climate Downturn Following the Antarctic Cold Reversal in New Zealand

Pauly

Turney

Palmer

et al. 2021

Geophysical Research Letters

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Significant attention in paleoclimate research has focused on the transitional period between the last glaciation and the current Holocene interglacial, known at the Late Glacial (∼14,700-11,600 cal BP). In the Northern Hemisphere (NH), the gradual warming was interrupted by numerous fast transitions to cold episodes of various lengths. The most prominent millennium-long cold reversal to near glacial conditions is evidenced in Greenland ice core δ 18 O and deuterium excess (GS-1; Figure 1h). This led to significant palynological changes in continental Europe characterizing the so-called Younger Dryas (YD) period (Brauer et al.

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The scientific value and potential of New Zealand swamp kauri

Cited by 22 publications

References 63 publications

Prograded coastal barriers provide paleoenvironmental records of storms and sea level during late Quaternary highstands

Prograded coastal barriers provide paleoenvironmental records of storms and sea level during late Quaternary highstands

A global environmental crisis 42,000 years ago

Kauri Tree‐Ring Stable Isotopes Reveal a Centennial Climate Downturn Following the Antarctic Cold Reversal in New Zealand

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