Preprints
https://doi.org/10.5194/egusphere-2022-69
https://doi.org/10.5194/egusphere-2022-69
 
24 Mar 2022
24 Mar 2022

Pacific Decadal Oscillation modulates the Arctic sea-ice loss influence on the mid-latitude atmospheric circulation in winter

Amélie Simon1,2, Guillaume Gastineau1, Claude Frankignoul1, Vladimir Lapin3, and Pablo Ortega3 Amélie Simon et al.
  • 1UMR LOCEAN, Sorbonne Université/IRD/MNHN/CNRS, Paris, France
  • 2Instituto Dom Luiz (IDL), Faculdade de Ciências, Universidade de Lisboa, Lisboa, Portugal
  • 3Barcelona Supercomputing Center, Barcelona, Spain

Abstract. The modulation of the winter impacts of Arctic sea ice loss by the Pacific Decadal Oscillation (PDO) is investigated in the IPSL-CM6A-LR ocean-atmosphere general circulation model. Ensembles of simulations are performed with constrained sea ice concentration corresponding to pre-industrial, present-day and future states, and initial conditions sampling warm and cold phases of the PDO. Using a general linear model, we estimate the simulated winter impact of sea ice loss, PDO and their combined effects. In response to sea ice loss, the Arctic lower troposphere warms and a negative North-Atlantic oscillation like pattern appears together with a weak deepening of the Aleutian Low. The two patterns are associated with a weakening of the poleward flank of the eddy-driven jet, while in the stratospheric the polar vortex weakens. Besides, a warm PDO phase induces a large positive Pacific North America pattern, as well as a small negative Arctic oscillation pattern associated with a weakening of the stratospheric polar vortex. However, the effects of PDO and Arctic sea ice loss are not additive. The Arctic sea ice teleconnections in both troposphere and stratosphere are reduced by the PDO, most importantly in the stratosphere. The results are discussed and compared to those obtained with the same model in atmosphere-only simulations, where sea ice loss does not significantly alter the stratospheric polar vortex.

Journal article(s) based on this preprint

04 Aug 2022
Pacific Decadal Oscillation modulates the Arctic sea-ice loss influence on the midlatitude atmospheric circulation in winter
Amélie Simon, Guillaume Gastineau, Claude Frankignoul, Vladimir Lapin, and Pablo Ortega
Weather Clim. Dynam., 3, 845–861, https://doi.org/10.5194/wcd-3-845-2022,https://doi.org/10.5194/wcd-3-845-2022, 2022
Short summary

Amélie Simon et al.

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-69', Nicholas Tyrrell, 20 Apr 2022
    • AC1: 'Reply on RC1', Amelie Simon, 03 Jun 2022
  • RC2: 'Comment on egusphere-2022-69', Anonymous Referee #2, 06 May 2022
    • AC2: 'Reply on RC2', Amelie Simon, 03 Jun 2022

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-69', Nicholas Tyrrell, 20 Apr 2022
    • AC1: 'Reply on RC1', Amelie Simon, 03 Jun 2022
  • RC2: 'Comment on egusphere-2022-69', Anonymous Referee #2, 06 May 2022
    • AC2: 'Reply on RC2', Amelie Simon, 03 Jun 2022

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision
AR by Amelie Simon on behalf of the Authors (03 Jun 2022)  Author's response    Author's tracked changes    Manuscript
ED: Referee Nomination & Report Request started (06 Jun 2022) by Tiina Nygård
RR by Nicholas Tyrrell (17 Jun 2022)
RR by Anonymous Referee #2 (23 Jun 2022)
ED: Publish as is (28 Jun 2022) by Tiina Nygård

Journal article(s) based on this preprint

04 Aug 2022
Pacific Decadal Oscillation modulates the Arctic sea-ice loss influence on the midlatitude atmospheric circulation in winter
Amélie Simon, Guillaume Gastineau, Claude Frankignoul, Vladimir Lapin, and Pablo Ortega
Weather Clim. Dynam., 3, 845–861, https://doi.org/10.5194/wcd-3-845-2022,https://doi.org/10.5194/wcd-3-845-2022, 2022
Short summary

Amélie Simon et al.

Amélie Simon et al.

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The requested preprint has a corresponding peer-reviewed final revised paper. You are encouraged to refer to the final revised version.

Short summary
This study shows, with numerical experiments, that the influence of the Arctic sea-ice loss on atmospheric circulation in mid-latitudes depends on persistent sea-surface temperature in the North Pacific.