Robust but weak winter atmospheric circulation response to future Arctic sea ice loss
Journal Article
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· Nature Communications
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- Met Office Hadley Centre, Exeter (United Kingdom); Met Office, Hadley Centre, Exeter (United Kingdom)
- Met Office Hadley Centre, Exeter (United Kingdom)
- University of Reading (United Kingdom)
- University of Toulouse (France)
- National Center for Atmospheric Research (NCAR), Boulder, CO (United States)
- University of Barcelona (Spain)
- Sorbonne University, Paris (France)
- Norwegian Meteorological Institute, Oslo (Norway)
- Chinese Academy of Sciences (CAS), Beijing (China)
- Helmholtz Centre for Polar and Marine Research, Bremerhaven (Germany)
- Barcelona Supercomputing Center, Barcelona (Spain)
- University of California, Irvine, CA (United States)
- Max-Planck-Institut für Meteorologie, Hamburg (Germany)
- Kyushu University, Fukuoka (Japan)
- Met Office Hadley Centre, Exeter (United Kingdom); University of Exeter (United Kingdom)
- University of Exeter (United Kingdom)
- Canadian Centre for Climate Modelling and Analysis, Victoria, BC (Canada)
- Colorado State University, Fort Collins, CO (United States)
The possibility that Arctic sea ice loss weakens mid-latitude westerlies, promoting more severe cold winters, has sparked more than a decade of scientific debate, with apparent support from observations but inconclusive modelling evidence. Here we show that sixteen models contributing to the Polar Amplification Model Intercomparison Project simulate a weakening of mid-latitude westerlies in response to projected Arctic sea ice loss. We develop an emergent constraint based on eddy feedback, which is 1.2 to 3 times too weak in the models, suggesting that the real-world weakening lies towards the higher end of the model simulations. Still, the modelled response to Arctic sea ice loss is weak: the North Atlantic Oscillation response is similar in magnitude and offsets the projected response to increased greenhouse gases, but would only account for around 10% of variations in individual years. We further find that relationships between Arctic sea ice and atmospheric circulation have weakened recently in observations and are no longer inconsistent with those in models.
- Research Organization:
- University of California, Irvine, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); European Union; UK-China Research and Innovation Partnership; Natural Environment Research Council (NERC); Research council of Norway; German Federal Ministry of Education and Research; National Science Foundation (NSF); Chinese Academy of Sciences; Spanish Ramón y Cajal’ programme; German Research Foundation (DFG)
- Grant/Contract Number:
- SC0019407
- OSTI ID:
- 1904333
- Journal Information:
- Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 13; ISSN 2041-1723
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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