Piora Oscillation

The Piora Oscillations are two cold periods in the Alpine climate history of the Holocene Epoch. Piora 1-O. is dated by Heinz Zoller (cited still as Raw-BP by Conradin A. Burga) to -5300 to -5000 conv. BP, only calibrated here from 4138 ± 113 to 3796 ± 109 BC. Piora 2-O. is dated to -4800 to -4400 conv. BP, calibrated both ends using OxCal 4.4 (Christopher Bronk Ramsey) from 3569 ±119 to 3081 ±150 BC.

The phenomenon is named after the Val Piora (Piora Valley) in Switzerland, where it was first detected.

The water level of Lake Constance in the Alps show a considerable history of variations as reconstructed from sediment and pollen analysis. In 5,375 BP (3,375 BCE) there occurred an abrupt rise in lake level at the archaeological site of Arbon-Bleiche 3, indicating a cooling of the temperatures. This caused an abandonment of this prehistoric lake-shore location.

See also

• Bond event
• 4.2-kiloyear event
• Bølling–Allerød warming
• African humid period
• Older Peron

Notes

References

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• Burroughs, William J. (2003). Climate: Into the 21st Century. Cambridge: Cambridge University Press. ISBN 0-521-79202-9.
• Caseldine, C.; Thompson, G.; Langdon, C.; Hendon, D. (2005). "Evidence for an extreme climatic event on Achill Island, Co. Mayo, Ireland around 5200–5100 cal. yr BP". Journal of Quaternary Science. 20 (2): 169–178. Bibcode:2005JQS....20..169C. doi:10.1002/jqs.901. S2CID 140619228.
• Hou, Mei; Wu, Wen Xiang (5 December 2020). "A review of 6000-5000 cal BP climatic anomalies in China". Quaternary International. 571: 58–72. doi:10.1016/j.quaint.2020.12.004. ISSN 1040-6182.
• Lamb, Hubert H. (1995). Climate, History, and the Modern World. London: Routledge. ISBN 0-415-12735-1.
• Magny, Michel; Haas, Jean Nicolas (2004). "A major widespread climatic change around 5300 cal. yr BP at the time of the Alpine Iceman". Journal of Quaternary Science. 19 (5): 423–430. Bibcode:2004JQS....19..423M. doi:10.1002/jqs.850. S2CID 128697360.
• Matossian, Mary A. K. (1997). Shaping World History: Breakthroughs in Ecology, Technology, Science, and Politics. New York: M. E. Sharpe. ISBN 0-7656-0061-7.
• Wick, Lucia; Tinner, Willy (1997). "Vegetation Changes and Timberline Fluctuations in the Central Alps as Indicators of Holocene Climatic Oscillations". Arctic and Alpine Research. 29 (4): 445–458. doi:10.2307/1551992. JSTOR 1551992.

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