The 5.2 ka climate event: Evidence from stable isotope and multi-proxy palaeoecological peatland records in Ireland

Roland, Thomas P.; Daley, Tim; Caseldine, Chris; Charman, Dan J.; Turney, Chris S. M.; Amesbury, Matthew J.; Thompson, Gareth; Woodley, Ewan J.

doi:10.1016/j.quascirev.2015.07.026

Cited by 63 publications

(29 citation statements)

References 160 publications

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“…On these views, it is believed that the variation of solar output makes the weakening of the Walker circulation, the increasing of El Niño events, and the shrinkage of the EAWM since the mid‐Holocene. This transition is synchronous with the onset of the “modern” ENSO (Moy et al, ; Sandweiss et al, ) and also is widely acknowledged globally in the mid‐Holocene (Mayewski et al, ; Steig, ) as the termination of the Holocene thermal maximum, the hemispheric even global cooling, drier conditions in central to eastern Asia and Africa under the abrupt weakening of the monsoonal system, wetter conditions in northern Europe and southern South America (Magny et al, ; Roland et al, ; Zhou et al, ). The synchronicity of all these transitions implies that a reorganization in the Earth's ocean‐atmosphere circulation system occurred in the mid‐Holocene.…”

Section: Resultsmentioning

confidence: 72%

Shrinkage of East Asia Winter Monsoon Associated With Increased ENSO Events Since the Mid‐Holocene

Liu

Cui

et al. 2019

JGR Atmospheres

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Instrumental records indicate a close relationship between the El Niño‐Southern Oscillation and the East Asian winter monsoon (EAWM) on interannual to decadal time scales. However, few studies have examined possible links between them on centennial/millennial time scales. In Northeast China, modern observations show that the immigration of temperate forest trees such as Pinus (pine) and Quercus (oak) into cold temperate boreal forest is sensitive to changes in winter temperature. Here we present a continuous high‐resolution pollen record from Lake Moon in the central part of the Great Khingan Mountain Range, Northeast China. The record reveals increasing contents of Pinus and Quercus pollen after ~6.0 ka cal. BP, which may indicate a gradual weakening of the EAWM. It is broadly coupled with an increasing El Niño frequency since the middle Holocene, and we observe a statistically significant correlation between the percentages of Pinus and Quercus and a time series of El Niño events. On the centennial to millennial time scale, the results of wavelet analysis and band‐pass filtering show that the occurrence and development of El Niño have also promoted a weaker EAWM after ~6.0 ka cal. BP, which is inversely correlated with the variation of the ca. 500‐year cycle originated from changes in solar output. These results imply that the climate transition in the mid‐Holocene is caused by the change of variations in solar activity and amplified by ocean circulation El Niño‐Southern Oscillation to influence the East Asian Monsoon system, especially the EAWM, and finally change the vegetation in Great Khingan Mountain Range.

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Section: Resultsmentioning

confidence: 72%

Shrinkage of East Asia Winter Monsoon Associated With Increased ENSO Events Since the Mid‐Holocene

Liu

Cui

et al. 2019

JGR Atmospheres

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“…However, in Ireland, the commensurate impact on the landscape is not seen in palaeoecological records-many pollen diagrams from this period indicate a phase of less extensive use of the landscape than would be expected under pastoralism, with evidence for forest regeneration in many parts of Ireland, especially westerly areas (O'Connell and Molloy 2001;Whitehouse et al 2014). The palaeoclimatic context of this period is also interesting, given that the end of the Holocene Thermal Maximum led to a sustained period of lower temperatures and wetter conditions in Ireland and elsewhere in northern Europe (Steig 1999;Roland et al 2015).…”

Section: Discussionmentioning

confidence: 98%

The Changing Face of Neolithic and Bronze Age Ireland: A Big Data Approach to the Settlement and Burial Records

et al. 2016

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This paper synthesizes and discusses the spatial and temporal patterns of archaeological sites in Ireland, spanning the Neolithic period and the Bronze Age transition (4300-1900 cal BC), in order to explore the timing and implications of the main changes that occurred in the archaeological record of that period. Large amounts of new data are sourced from unpublished developer-led excavations and combined with national archives, published excavations and online databases. Bayesian radiocarbon models and contextand sample-sensitive summed radiocarbon probabilities are used to examine the dataset. The study captures the scale and timing of the initial expansion of Early Neolithic settlement and the ensuing attenuation of all such activity-an apparent boom-and-bust cycle. The Late Neolithic and Chalcolithic periods are characterised by a resurgence and diversification of activity. Contextualisation and spatial analysis of radiocarbon data reveals finer-scale patterning than is usually possible with summed-probability approaches: the boom-and-bust models of prehistoric populations may, in fact, be a misinterpretation of more subtle demographic changes occurring at the same time as cultural change and attendant differences in the archaeological record.

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“…A general increase in fire activity and dry peat surface conditions was identified between 5500 and 4800 cal yr BP in the Romanian Carpathians (Feurdean et al, 2012). Warmer/drier climatic conditions were also reconstructed around 5500 cal yr BP based on stalagmite stable oxygen isotopes from the Apuseni that has been reported globally (Magny et al, 2006;Roland et al, 2015) and characterized by locally wet and/or cool conditions.…”

mentioning

confidence: 99%

A 9000 year record of cyclic vegetation changes identified in a montane peatland deposit located in the Eastern Carpathians (Central-Eastern Europe): Autogenic succession or regional climatic influences?

Gałka

Tanţău

Ersek

et al. 2016

Palaeogeography, Palaeoclimatology, Palaeoecology

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The 5.2 ka climate event: Evidence from stable isotope and multi-proxy palaeoecological peatland records in Ireland

Cited by 63 publications

References 160 publications

Shrinkage of East Asia Winter Monsoon Associated With Increased ENSO Events Since the Mid‐Holocene

Shrinkage of East Asia Winter Monsoon Associated With Increased ENSO Events Since the Mid‐Holocene

The Changing Face of Neolithic and Bronze Age Ireland: A Big Data Approach to the Settlement and Burial Records

A 9000 year record of cyclic vegetation changes identified in a montane peatland deposit located in the Eastern Carpathians (Central-Eastern Europe): Autogenic succession or regional climatic influences?

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