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Abrupt temperature changes during the last 1,500 years
Stockholm University, Faculty of Humanities, Department of History.
2013 (English)In: Journal of Theoretical and Applied Climatology, ISSN 0177-798X, E-ISSN 1434-4483, Vol. 112, no 1-2, 215-225 p.Article in journal (Refereed) Published
Abstract [en]

We investigate the occurrence of abrupt changes in a total of 35 different proxy records from the extra-tropical Northern Hemisphere for the last ~1,500 years. The proxy records include ice-core δ18O, speleothem, tree ring width/density, marine sediment and lake sediment records with annual, sub-decadal or decadal resolutions. The aim is to explore the spatio–temporal distribution of abrupt climate changes using a kink point analysis technique. A clustering of warm kink points (the kink points with the highest temperatures) around AD 1000 appears corresponding to the Medieval Warm Period and indicates a geographically widespread temperature peak at that time. Kink points around AD 1000 are somewhat more numerous on higher latitudes than on lower latitudes. There are some tendencies for the coldest kink points (the kink points with the lowest temperatures) to be clustered in the ninetenth century, but they are generally more unevenly spaced in time than the warm peaks around AD 1000. The relative lack of kink points detected during the 1500 s–1700 s, likely the coldest part of the Little Ice Age, implies that this cold period was relatively stable and without abrupt events. A possible cluster of kink points on lower latitudes in the early ninth century is also found. No clear difference in the timing of kink points between the different proxy types can be observed.

Place, publisher, year, edition, pages
2013. Vol. 112, no 1-2, 215-225 p.
Keyword [en]
Climate change, kink points, palaeoclimatology, Medieval Warm Period, Little Ice Age, global warming
National Category
Climate Research
Research subject
Physical Geography; Meteorology
URN: urn:nbn:se:su:diva-78756DOI: 10.1007/s00704-012-0725-8ISI: 000316574700016OAI: diva2:543681
Available from: 2012-08-09 Created: 2012-08-09 Last updated: 2013-05-07Bibliographically approved

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Charpentier Ljungqvist, Fredrik
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