The Summer North Atlantic Oscillation, Arctic sea ice, and Arctic jet Rossby wave forcing

We use Coupled Model Intercomparison Project Phase 6 (CMIP6) coupled and Atmospheric Model Intercomparison Project (AMIP) climate models, dynamical analyses, and observations to investigate interactions between summer Arctic sea ice concentration (SIC) variations and the Summer North Atlantic Oscill...

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Bibliographic Details
Published in:Science Advances
Main Authors: Folland, Chris K., Ou, Tinghai, Linderholm, Hans W., Scaife, Adam A., Knight, Jeff, Chen, Deliang
Format: Article in Journal/Newspaper
Language:unknown
Published: American Association for the Advancement of Science (AAAS) 2024
Subjects:
Arctic
Canada
North Atlantic
North Atlantic oscillation
Sea ice
Online Access:https://research.usq.edu.au/item/zqzx1/the-summer-north-atlantic-oscillation-arctic-sea-ice-and-arctic-jet-rossby-wave-forcing
https://research.usq.edu.au/download/acc96c093d097399378c051fcccedb7cbad120b0983159882f25ec9d54ba742f/8344309/sciadv.adk6693.pdf
https://doi.org/10.1126/sciadv.adk6693
Description
Summary:We use Coupled Model Intercomparison Project Phase 6 (CMIP6) coupled and Atmospheric Model Intercomparison Project (AMIP) climate models, dynamical analyses, and observations to investigate interactions between summer Arctic sea ice concentration (SIC) variations and the Summer North Atlantic Oscillation (SNAO). Observations suggest that SIC-SNAO relationships mainly come from the East Siberian to Arctic Canada (ESAC) region where a weak atmospheric jet stream exists in summer. Twelve CMIP6 models with the most realistic atmospheric climatologies over the North Atlantic and Europe agree well with reanalyses on relationships between SIC and Northern Hemisphere atmospheric circulation. CMIP6 model data indicate that ESAC SIC influences the SNAO with a lead time of several weeks. However, AMIP simulations do not reproduce the observed atmospheric circulation when observed sea ice is prescribed. Rossby wave analyses do though support observed ESAC SIC influences on the SNAO. We conclude that ESAC Arctic SIC modestly influences the SNAO, and such investigations require the use of coupled models.

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