(Table S1) Radiocarbon dates of organic matter from Lena Delta ice wedges, supplement to: Meyer, Hanno; Opel, Thomas; Laepple, Thomas; Dereviagin, Alexander Yu; Hoffmann, Kirstin; Werner, Martin (2015): Long-term winter warming trend in the Siberian Arctic during the mid- to late Holocene. Nature Geoscience, 8(2), 122-125

DOI

Relative to the past 2,000 years, the Arctic region has warmed significantly over the past few decades. However, the evolution of Arctic temperatures during the rest of the Holocene is less clear. Proxy reconstructions, suggest a long-term cooling trend throughout the mid- to late Holocene, whereas climate model simulations show only minor changes or even warming. Here we present a record of the oxygen isotope composition of permafrost ice wedges from the Lena River Delta in the Siberian Arctic. The isotope values, which reflect winter season temperatures, became progressively more enriched over the past 7,000 years, reaching unprecedented levels in the past five decades. This warming trend during the mid- to late Holocene is in opposition to the cooling seen in other proxy records. However, most of these existing proxy records are biased towards summer temperatures. We argue that the opposing trends are related to the seasonally different orbital forcing over this interval. Furthermore, our reconstructed trend as well as the recent maximum are consistent with the greenhouse gas forcing and climate model simulations, thus reconciling differing estimates of Arctic and northern high-latitude temperature evolution during the Holocene.

Identifier
DOI http://dx.doi.org/doi:10.1594/PANGAEA.842166
Metadata Access http://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite3&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.842166
Provenance
Creator Werner, Martin;Laepple, Thomas;Meyer, Hanno;Dereviagin, Alexander Yu;Hoffmann, Kirstin;Opel, Thomas
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2015
Rights Creative Commons Attribution 3.0 Unported (CC-BY)
Representation
Language English
Resource Type Supplementary Dataset
Format text/tab-separated-values
Coverage
Discipline Earth System Research
Spatial Coverage (72N,126E)