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Eurasian Arctic climate over the past two millennia as recorded in the Akademii Nauk ice core (Severnaya Zemlya, Russian Arctic)

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Citation:
Fritzsche, D. , Opel, T. and Meyer, H. (2012): Eurasian Arctic climate over the past two millennia as recorded in the Akademii Nauk ice core (Severnaya Zemlya, Russian Arctic) , European Geosciences Union, General Assembly 2012, Vienna, 22 April 2012 - 27 April 2012 .
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Abstract:

In the context of the ongoing and future strong warming of the Arctic detailed knowledge of past climate changes in particular on a regional scale is crucial. An ice core drilled on the Akademii Nauk (AN) ice cap (Severnaya Zemlya, 80.52°N, 94.82°E) at a relatively low altitude of about 750 m a.s.l. has shown to provide high-resolution climate proxy data from the Central Russian Arctic, although the ice cap is affected by melt-water infiltration. Here for the first time, we present d18O and major ion records for the last about two millennia. The age-depth relationship of the core is based on annual layer counting and volcanic reference layers for cross-checking (Bezymianny 1956, Katmai 1912, Laki 1783, unknown volcano 1259, Eldgja 934). The multi-annual AN d18O data are highly correlated to instrumental temperature data from the Western Eurasian Arctic (e.g. Vardø/Northern Norway)and thus provide a valuable near-surface temperature proxy for this region, also underlined by the good coincidence with the Austfonna (Svalbard) ice core d18O data. The long-term decrease of AN d18O data does not solely reflect climate cooling but probably also a growing of AN ice cap. AN d18O record reveal major temperature changes over the last centuries, e.g. the absolute minimum around 1800 and the exceptional warming to a maximum in early 20th century (Early Twentieth Century Warming – ETCW), representing the temperature maximum of the record. By comparison with meteorological data it can be shown that a double-peak structure of the ETCW is a peculiarity of the Barents and Kara Sea region. Neither a pronounced Medieval Climate Anomaly nor a Little Ice Age could be identified. In contrast, AN ice-core records show evidence for several abrupt warming and cooling events such as in the 15th and 16th centuries. These abrupt changes might be analogous to the ETCW and probably caused by shifts in the atmospheric circulation patterns and accompanied sea-ice feedbacks in the Barents and Kara seas region that highlight the role of the internal variability of the Arctic climate system.

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