气候变化领域集成服务门户(CCPortal): A multi-proxy μ-XRF inferred lake sediment record of environmental change spanning the last ca. 2230 years from Lake Kanono; Northland; New Zealand

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DOI	10.1016/j.quascirev.2019.106000
	A multi-proxy μ-XRF inferred lake sediment record of environmental change spanning the last ca. 2230 years from Lake Kanono; Northland; New Zealand
	Evans G.; Augustinus P.; Gadd P.; Zawadzki A.; Ditchfield A.
发表日期	2019
ISSN	0277-3791
卷号	225
英文摘要	Reliable interpretation of annual-resolution climate proxies for wind, precipitation, and detrital influx are required for identifying the onset and periodicities of climatic events. In particular, this is essential for the evaluation of inter-annual, decadal, and centennial trends driven by shifting positions of the Southern Westerly Winds (SWW) and subsequent storm belts associated with the Southern Annular Mode (SAM) and El Niño Southern Oscillation (ENSO). Here we present a quasi-annual data set of μ-XRF time series spanning ca. 2230 years from lake sediment cores from Lake Kanono, Northland, New Zealand. The μ-XRF time series were interpreted using a combination of principal component analysis (PCA) and cluster analysis, then verified with comparison to regionally averaged empirical rainfall and wind climate station data. Our results show that the wavelet patterns align with the PCA results allowing the μ-XRF time series to be classified into: Group I (detrital) and Group II (biological productivity and normalized climate proxies). The normalized Group II μ-XRF time series wavelet analyses displayed periodicities in the 2–16 year frequency, likely associated with ENSO, from ca. 237 BCE – 1330 CE. The data show clear evidence of both Polynesian and European settlement phases in this part of northern New Zealand, and that Polynesian settlement impact was coeval with changes in ENSO intensity and a phase shift in SAM ca. 1350 CE. The Medieval Climate Anomaly (MCA) and the Little Ice Age (LIA) appear in the μ-XRF time series data as separate clusters. This data suggests that the MCA is associated with windy/dry conditions with intermittent storminess. During the LIA, the 2–16 year periodicity associated with ENSO decreased and centennial to multi-decadal length periodicities increase, which may be an indication of an underlying SAM signal within the data. European settlement also had a direct impact on the lake basin via increased detrital influx, likely from farming activities and intensification of local forestry operations. © 2019 Elsevier Ltd
英文关键词	Dune lake sediments; Holocene; Itrax
语种	英语
scopus关键词	Atmospheric pressure; Climatology; Cluster analysis; Lakes; Principal component analysis; Sediments; Storms; Time series; Biological productivity; Holocenes; Itrax; Lake sediments; Lake-sediment records; Medieval Climate Anomaly (MCA); Southern Annular Mode; Southern westerly winds; Time series analysis; El Nino-Southern Oscillation; environmental change; Holocene; lacustrine deposit; Little Ice Age; principal component analysis; proxy climate record; storm surge; time series analysis; wavelet analysis; New Zealand; North Island; Northland
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151694
作者单位	School of Environment, University of Auckland, PB 92019, Auckland, 1010, New Zealand; Australia's Nuclear Science and Technology Organisation, New Illawarra Rd, Lucas HeightsNSW 2234, Australia
推荐引用方式 GB/T 7714	Evans G.,Augustinus P.,Gadd P.,et al. A multi-proxy μ-XRF inferred lake sediment record of environmental change spanning the last ca. 2230 years from Lake Kanono; Northland; New Zealand[J],2019,225.
APA	Evans G.,Augustinus P.,Gadd P.,Zawadzki A.,&Ditchfield A..(2019).A multi-proxy μ-XRF inferred lake sediment record of environmental change spanning the last ca. 2230 years from Lake Kanono; Northland; New Zealand.Quaternary Science Reviews,225.
MLA	Evans G.,et al."A multi-proxy μ-XRF inferred lake sediment record of environmental change spanning the last ca. 2230 years from Lake Kanono; Northland; New Zealand".Quaternary Science Reviews 225(2019).