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Multi-proxy reconstruction of Arctic summer temperatures over the past 1400 years
Stockholm University, Faculty of Humanities, Department of History.
2012 (English)In: Climate Research (CR), ISSN 0936-577X, E-ISSN 1616-1572, Vol. 54, no 2, 113-128 p.Article in journal (Refereed) Published
Abstract [en]

A new multi-proxy summer (June–August) temperature reconstruction for the Arctic region (60°N–90°N) with annual resolution over the past 1400 years is presented. The reconstruction is performed using a novel ensemble method, Ensemble-LOC, designed to preserve low-frequency variability and minimize the influence of the “spurious correlation” between the proxy and instrumental data. The reconstruction is based on a set of 22 proxy records with annual resolution. We find clear evidences for a cold anomaly c. AD 630–770 related to the Dark Age Cold Period, a warm anomaly c. 950–1050 related to the Medieval Climate Anomaly, and a cold anomaly c. AD 1200–1900 related to the Little Ice Age. The strong 20th century warming is also evident. There are three different and distinct warm periods occurring during the Little Ice Age: AD 1470–1510, AD 1550–1570, and AD 1750–1770. However, about half of the total input proxies are not used in the large majority of the reconstructions. We still need additional proxy records from the Arctic region with annual resolution and a strong response to local temperature to further verify the results of this study and in order to investigate possible spatial patterns of past Arctic temperature variability.

Place, publisher, year, edition, pages
2012. Vol. 54, no 2, 113-128 p.
Keyword [en]
Climate change, global warming, paleoclimatology, Arctic, Medieval Climate Anomaly, Little Ice Age
National Category
Climate Research
Research subject
Physical Geography; Meteorology
URN: urn:nbn:se:su:diva-78758DOI: 10.3354/cr01112ISI: 000309124800002OAI: diva2:543689
Available from: 2012-08-09 Created: 2012-08-09 Last updated: 2012-11-02Bibliographically approved

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Charpentier Ljungqvist, Fredrik
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Department of History
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