Journal
SCIENCE
Volume 337, Issue 6092, Pages 315-320Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1222135
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Funding
- ICDP
- NSF
- German Federal Ministry of Education and Research (BMBF)
- Alfred Wegener Institute
- Helmholtz Centre Potsdam (GFZ)
- Russian Academy of Sciences Far East Branch
- Russian Foundation for Basic Research
- Austrian Federal Ministry of Science and Research
- BMBF [03G0642]
- German Research Foundation (Deutsche Forschungsgemeinschaft) [ME 1169/21, ME 1169/24]
- NSF [0602471]
- Vetenskapsradet
- Swedish Research Council
- Kempe Foundation
- Civilian Research and Development Foundation [RUG1-2987-MA-10]
- Directorate For Geosciences
- Division Of Earth Sciences [1204087] Funding Source: National Science Foundation
- Division Of Earth Sciences
- Directorate For Geosciences [0602471] Funding Source: National Science Foundation
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The reliability of Arctic climate predictions is currently hampered by insufficient knowledge of natural climate variability in the past. A sediment core from Lake El'gygytgyn in northeastern (NE) Russia provides a continuous, high-resolution record from the Arctic, spanning the past 2.8 million years. This core reveals numerous super interglacials during the Quaternary; for marine benthic isotope stages (MIS) 11c and 31, maximum summer temperatures and annual precipitation values are similar to 4 degrees to 5 degrees C and similar to 300 millimeters higher than those of MIS 1 and 5e. Climate simulations show that these extreme warm conditions are difficult to explain with greenhouse gas and astronomical forcing alone, implying the importance of amplifying feedbacks and far field influences. The timing of Arctic warming relative to West Antarctic Ice Sheet retreats implies strong interhemispheric climate connectivity.
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