Preprints
https://doi.org/10.5194/egusphere-2022-387
https://doi.org/10.5194/egusphere-2022-387
 
25 May 2022
25 May 2022

A modeling framework to understand transient ocean climate change in large coupled ensembles

Yona Silvy1, Clément Rousset1, Eric Guilyardi1,2, Jean-Baptiste Sallée1, Juliette Mignot1, Christian Ethé3, and Gurvan Madec1 Yona Silvy et al.
  • 1LOCEAN-IPSL, Laboratoire d’Océanographie et du Climat: Expérimentation et Approches Numériques, Sorbonne Université/CNRS/IRD/MNHN, Paris, France
  • 2NCAS-Climate, University of Reading, Reading, UK
  • 3IPSL, Institut Pierre-Simon Laplace, Sorbonne Université, CNRS, Paris, France

Abstract. The ocean responds to climate change through modifications of heat, freshwater and momentum fluxes at its boundaries. The role of these contributors in changing the thermohaline structure of the ocean and its circulation has been partly addressed by modeling studies using idealized CO2 forcings. The question of timescales for these individual contributions during transient climate change is however lacking. Here, we propose a novel modeling framework to isolate these contributions during the entire historical period and projections of coupled climate models. We present the framework in the context of the IPSL-CM6A-LR model and its ocean component NEMO3.6. We start by reproducing a coupled pre-industrial control simulation with an ocean-only configuration, forced by fixed fluxes at its interface diagnosed from the coupled model. We then add a perturbation to each flux component, extracted from the historical+ssp ensemble of simulations of IPSL-CM6A-LR. With this configuration, we successfully replicate the ocean's response to transient climate change in the coupled model during 1850–2100. This full response is then decomposed in sensitivity experiments in which the perturbations are applied individually to the heat, freshwater and momentum fluxes. Passive tracers of temperature and salinity are implemented to discriminate the addition of heat and freshwater flux anomalies in the ocean from the redistribution of pre-industrial heat and salt content in response to ocean circulation changes. This framework brings new opportunities to precisely explore the mechanisms driving transient ocean changes within single climate models.

Journal article(s) based on this preprint

21 Oct 2022
A modeling framework to understand historical and projected ocean climate change in large coupled ensembles
Yona Silvy, Clément Rousset, Eric Guilyardi, Jean-Baptiste Sallée, Juliette Mignot, Christian Ethé, and Gurvan Madec
Geosci. Model Dev., 15, 7683–7713, https://doi.org/10.5194/gmd-15-7683-2022,https://doi.org/10.5194/gmd-15-7683-2022, 2022
Short summary

Yona Silvy et al.

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CEC1: 'Comment on egusphere-2022-387', Juan Antonio Añel, 16 Jun 2022
    • AC1: 'Reply on CEC1', Yona Silvy, 18 Jul 2022
  • RC1: 'Comment on egusphere-2022-387', Anonymous Referee #1, 21 Jun 2022
  • RC2: 'Comment on egusphere-2022-387', Anonymous Referee #2, 01 Jul 2022
  • RC3: 'Comment on egusphere-2022-387', Anonymous Referee #3, 21 Jul 2022
  • AC2: 'Comment on egusphere-2022-387', Yona Silvy, 28 Jul 2022

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CEC1: 'Comment on egusphere-2022-387', Juan Antonio Añel, 16 Jun 2022
    • AC1: 'Reply on CEC1', Yona Silvy, 18 Jul 2022
  • RC1: 'Comment on egusphere-2022-387', Anonymous Referee #1, 21 Jun 2022
  • RC2: 'Comment on egusphere-2022-387', Anonymous Referee #2, 01 Jul 2022
  • RC3: 'Comment on egusphere-2022-387', Anonymous Referee #3, 21 Jul 2022
  • AC2: 'Comment on egusphere-2022-387', Yona Silvy, 28 Jul 2022

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision
AR by Yona Silvy on behalf of the Authors (08 Sep 2022)  Author's response    Author's tracked changes    Manuscript
ED: Referee Nomination & Report Request started (08 Sep 2022) by Riccardo Farneti
RR by Anonymous Referee #1 (13 Sep 2022)
RR by Anonymous Referee #2 (25 Sep 2022)
ED: Publish subject to minor revisions (review by editor) (25 Sep 2022) by Riccardo Farneti
AR by Yona Silvy on behalf of the Authors (04 Oct 2022)  Author's response    Author's tracked changes    Manuscript
ED: Publish as is (06 Oct 2022) by Riccardo Farneti

Journal article(s) based on this preprint

21 Oct 2022
A modeling framework to understand historical and projected ocean climate change in large coupled ensembles
Yona Silvy, Clément Rousset, Eric Guilyardi, Jean-Baptiste Sallée, Juliette Mignot, Christian Ethé, and Gurvan Madec
Geosci. Model Dev., 15, 7683–7713, https://doi.org/10.5194/gmd-15-7683-2022,https://doi.org/10.5194/gmd-15-7683-2022, 2022
Short summary

Yona Silvy et al.

Yona Silvy 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
A modeling framework is introduced to understand and decompose the mechanisms causing the ocean temperature, salinity and circulation to change since the pre-industrial period and into 21st century scenarios of global warming. This framework aims to look at the response to changes in the winds, and in heat and freshwater exchanges at the ocean interface in global climate models, throughout the 1850–2100 period, to unravel their individual effects on the changing physical structure of the ocean.