Preboreal oscillation explained

The preboreal oscillation (PBO) was a short cooling period within the preboreal stage of the Holocene epoch.

Definition

Based on evidence from pollen, early Holocene cooling periods have been discovered already from the 1960s on. Locally, they were referred to as ‘Friesland Oscillation’ (Denmark [1]), ‘Youngest Dryas’ (Germany [2]), ‘Rammelbeek Phase’ (Netherlands [3]), and ‘Piottino Oscillation’ (Switzerland [4]). The term "preboreal oscillation" was derived from attempts to synchronize these events.[5] [6]

Dating

The greenland ice cores record a distinct decline in stable oxygen isotope data dated to 11 650–11 270 ice layer a BP (11 700–11 320 b2k) with the coldest part between 11 470 and 11 350 ice layer a BP (11 520–11 400 b2k) labelled as the ‘11.4 ka event’.[7]

In lake sedimentary records, the exact timing and duration of the PBO remain uncertain because of dating uncertainties due to two early Holocene radiocarbon plateau and unclear proxy evidence. [8] [9] Two ash layers derived from volcanic eruptions are frequently used as time markers for the PBO: the Askja-S and Hässeldalen tephras shortly before and after the event. [10] The ages of these layers were constrained to 11.228 ± 226 cal a BP and 11.380 ± 216 cal a BP, framing the cold event to a maximum duration of 152 +11/-8 years by varve counting. [11]

References

  1. Iversen . Johs. . 1973-12-31 . Geology of Denmark III: The Development of Denmark's Nature since the Last Glacial . Danmarks Geologiske Undersøgelse V. Række . 7 . 1–126 . 10.34194/raekke5.v7.7020 . 2597-3037. free .
  2. Behre . Karl-Ernst . 1978 . Die Klimaschwankungen im europäischen Präboreal . Petermans geographische Mitteilungen . 2 . 97–102.
  3. Bos . Johanna A.A. . van Geel . Bas . van der Plicht . Johannes . Bohncke . Sjoerd J.P. . 2007 . Preboreal climate oscillations in Europe: Wiggle-match dating and synthesis of Dutch high-resolution multi-proxy records . Quaternary Science Reviews . en . 26 . 15–16 . 1927–1950 . 10.1016/j.quascirev.2006.09.012. 2007QSRv...26.1927B .
  4. Zoller . H. . 1960 . Pollenanalytische Untersuchungen zur Vegetationsgeschichte der insubrischen Schweiz. . Denkschriften der Schweizerischen Naturforschenden Gesellschaft . 83 . 45–156.
  5. Lowe . J. John . Ammann . B. . Birks . H. H. . Björck . S. . Coope . G. R. . Cwynar . L. . de Beaulieu . J.-L. . Mott . R. J. . Peteet . D. M. . Walker . M. J. C. . 1994 . Climatic changes in areas adjacent to the North Atlantic during the last glacial-interglacial transition (14-9 ka BP): A contribution to IGCP-253 . Journal of Quaternary Science . en . 9 . 2 . 185–198 . 10.1002/jqs.3390090215. 1994JQS.....9..185L .
  6. Björck . Svante . Kromer . Bernd . Johnsen . Sigfus . Bennike . Ole . Hammarlund . Dan . Lemdahl . Geoffrey . Possnert . Göran . Rasmussen . Tine Lander . Wohlfarth . Barbara . Hammer . Claus Uffe . Spurk . Marco . 1996 . Synchronized Terrestrial Atmospheric Deglacial Records Around the North Atlantic . Science . en . 274 . 5290 . 1155–1160 . 10.1126/science.274.5290.1155 . 8895457 . 1996Sci...274.1155B . 45121979 . 0036-8075.
  7. Rasmussen . Sune O. . Bigler . Matthias . Blockley . Simon P. . Blunier . Thomas . Buchardt . Susanne L. . Clausen . Henrik B. . Cvijanovic . Ivana . Dahl-Jensen . Dorthe . Johnsen . Sigfus J. . Fischer . Hubertus . Gkinis . Vasileios . Guillevic . Myriam . Hoek . Wim Z. . Lowe . J. John . Pedro . Joel B. . 2014 . A stratigraphic framework for abrupt climatic changes during the Last Glacial period based on three synchronized Greenland ice-core records: refining and extending the INTIMATE event stratigraphy . Quaternary Science Reviews . en . 106 . 14–28 . 10.1016/j.quascirev.2014.09.007. 2014QSRv..106...14R . 55614771 . free . 2160/30436 . free .
  8. Björck . S. . Rundgren . M. . Ingólfsson . Ó. . Funder . S. . 1997 . The Preboreal oscillation around the Nordic Seas: terrestrial and lacustrine responses . Journal of Quaternary Science . 12 . 6 . 455–465 . 10.1002/(SICI)1099-1417(199711/12)12:6<455::AID-JQS316>3.0.CO;2-S. 1997JQS....12..455B .
  9. Hoek . Wim Z. . Bos . Johanna A.A. . 2007 . Early Holocene climate oscillations—causes and consequences . Quaternary Science Reviews . en . 26 . 15–16 . 1901–1906 . 10.1016/j.quascirev.2007.06.008. 2007QSRv...26.1901H .
  10. Wohlfarth . B. . Blaauw . M. . Davies . S. M. . Andersson . M. . Wastegård . S. . Hormes . A. . Possnert . G. . 2006 . Constraining the age of Lateglacial and early Holocene pollen zones and tephra horizons in southern Sweden with Bayesian probability methods. . Journal of Quaternary Science . 21 . 4 . 321–334 . 10.1002/jqs.996. 2006JQS....21..321W . 67800522 .
  11. Ott . Florian . Wulf . Sabine . Serb . Johanna . Słowiński . Michał . Obremska . Milena . Tjallingii . Rik . Błaszkiewicz . Mirosław . Brauer . Achim . 2016 . Constraining the time span between the Early Holocene Hässeldalen and Askja-S Tephras through varve counting in the Lake Czechowskie sediment record, Poland: VARVE COUNTING BETWEEN THE HÄSSELDALEN AND AKSJA-S TEPHRA . Journal of Quaternary Science . en . 31 . 2 . 103–113 . 10.1002/jqs.2844. 131161085 .

[[Category:Quaternary]]

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