Annual-layer thickness, δ¹⁸O and sodium values on Akademii Nauk ice core (AD 900-1998) based on core chronology AN 2012

Understanding recent Arctic climate change requires detailed information on past changes, in particular on a regional scale. The extension of the depth–age relation of the Akademii Nauk (AN) ice core from Severnaya Zemlya (SZ) to the last 1100 yr provides new perspectives on past climate fluctuation...

Full description

Bibliographic Details
Main Authors: Opel, Thomas, Fritzsche, Diedrich, Meyer, Hanno
Format: Dataset
Language:English
Published: PANGAEA 2013
Subjects:
Age
Akademii Nauk
Severnaya Zemlya
Russian Arctic
AN
Annual layer thickness
AWI_PerDyn
AWI Arctic Land Expedition
ICEDRILL
Ice drill
Ion chromatography IC20 (Dionex Corp.)
Mass spectrometer Finnigan Delta-S
Permafrost Research (Periglacial Dynamics) @ AWI
RU-Land_1999/2001_SevernayaZemly
Sodium
SZ_1999/2001
δ18O
water
Arctic
Climate change
Ice
Ice cap
ice core
permafrost
Sea ice
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.824732
https://doi.org/10.1594/PANGAEA.824732
Description
Summary:Understanding recent Arctic climate change requires detailed information on past changes, in particular on a regional scale. The extension of the depth–age relation of the Akademii Nauk (AN) ice core from Severnaya Zemlya (SZ) to the last 1100 yr provides new perspectives on past climate fluctuations in the Barents and Kara seas region. Here, we present the easternmost high-resolution ice-core climate proxy records (d18O and sodium) from the Arctic. Multi-annual AN d18O data as near-surface air-temperature proxies reveal major temperature changes over the last millennium, including the absolute minimum around 1800 and the unprecedented warming to a double-peak maximum in the early 20th century. The long-term cooling trend in d18O is related to a decline in summer insolation but also to the growth of the AN ice cap as indicated by decreasing sodium concentrations. Neither a pronounced Medieval Climate Anomaly nor a Little Ice Age are detectable in the AN d18O record. In contrast, there is evidence of several abrupt warming and cooling events, such as in the 15th and 16th centuries, partly accompanied by corresponding changes in sodium concentrations. These abrupt changes are assumed to be related to sea-ice cover variability in the Barents and Kara seas region, which might be caused by shifts in atmospheric circulation patterns. Our results indicate a significant impact of internal climate variability on Arctic climate change in the last millennium.

Similar Items