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Climate oscillations as recorded in Svalbard ice core δ 18O records between 1200-1997 AD
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2005 (English)In: Geografiska Annaler. Series A, Physical Geography, ISSN 0435-3676, E-ISSN 1468-0459, Vol. 87a, no 1, 203-214 p.Article in journal (Refereed) Published
Abstract [en]

We apply two different time series analytical tools to omega18O records from two Svalbard ice cores. One ice core is from Lomonosovfonna at 1250 ma.s.l. and the other from Austfonna at 750 m a.s.l. These cores are estimated to cover at least the past 800 years and have been dated using a combination of known reference horizons and glacial modelling. Wavelet analysis reveals low frequency oscillations on the 60-120-year scale on the lower elevation site Austfonna while the higher altitude site on Lomonosovfonna does not reveal such variability throughout the record. The second method, Significant Zero Crossing of Derivates (SiZer) does not resolve the low-frequency periodicity seen in the wavelet analysis. The low-frequency variability resolved by the wavelet analysis is similar to what has been found in various climate records including instrumental temperatures and tree-rings, and has been proposed as the most important oscillation for the observed trends in Arctic air temperatures.

Place, publisher, year, edition, pages
2005. Vol. 87a, no 1, 203-214 p.
Keyword [en]
ao, arctic oscillation, climate change, decadal scale variability, hurrell 1995, ice cores, nao, naturally north atlantic oscillation, oxygen isotopes, svalbard, thompson
National Category
Earth and Related Environmental Sciences
URN: urn:nbn:se:uu:diva-76021DOI: 10.1111/j.0435-3676.2005.00253.xOAI: oai:DiVA.org:uu-76021DiVA: diva2:103932
Available from: 2006-05-09 Created: 2006-05-09 Last updated: 2013-04-02Bibliographically approved

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Pohjola, Veijo
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