Preprints
https://doi.org/10.5194/egusphere-2022-976
https://doi.org/10.5194/egusphere-2022-976
06 Oct 2022
 | 06 Oct 2022

Better constrained climate sensitivity when accounting for dataset dependency on pattern effect estimates

Angshuman Modak and Thorsten Mauritsen

Abstract. Equilibrium climate sensitivity (ECS) constrained based on the instrumental record of the historical warming becomes coherent with other lines evidence when the dependence of radiative feedbacks on the pattern of surface temperature change (pattern effect) is incorporated. Pattern effect strength is usually estimated with atmosphere-only model simulations forced with observed historical sea-surface temperature (SST) and sea-ice change, and constant pre-industrial forcing. However, recent studies indicate that pattern effect estimates depend on the choice of SST boundary condition dataset, due to differences in the measurement sources and the techniques used to merge and construct them. Here, we systematically explore this dataset dependency by applying seven different observed SST datasets to the MPI-ESM1.2-LR model covering 1871–2017. We find that the pattern effect ranges from -0.01 ± 0.09 Wm-2 K-1 to 0.42 ± 0.10 Wm-2 K-1 (standard error), whereby the commonly used AMIPII dataset produces by far the largest estimate. When accounting for the generally weaker pattern effect in MPI-ESM1.2-LR compared to other models, as well as dataset dependency and inter-model spread, we obtain a combined pattern effect estimate of 0.30 Wm-2 K-1 [-0.14 to 0.74 Wm-2 K-1] (5–95 percentiles) and a resulting instrumental record ECS estimate of 3.1 K [1.7 to 9.2 K], which is slightly lower and better constrained than in previous studies.

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Journal article(s) based on this preprint

11 Jul 2023
Better-constrained climate sensitivity when accounting for dataset dependency on pattern effect estimates
Angshuman Modak and Thorsten Mauritsen
Atmos. Chem. Phys., 23, 7535–7549, https://doi.org/10.5194/acp-23-7535-2023,https://doi.org/10.5194/acp-23-7535-2023, 2023
Short summary
Angshuman Modak and Thorsten Mauritsen

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-976', Anonymous Referee #1, 03 Nov 2022
    • AC1: 'Reply on RC1', Angshuman Modak, 21 Mar 2023
  • RC2: 'Comment on egusphere-2022-976', Tim Andrews, 11 Nov 2022
    • AC2: 'Reply on RC2', Angshuman Modak, 21 Mar 2023

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-976', Anonymous Referee #1, 03 Nov 2022
    • AC1: 'Reply on RC1', Angshuman Modak, 21 Mar 2023
  • RC2: 'Comment on egusphere-2022-976', Tim Andrews, 11 Nov 2022
    • AC2: 'Reply on RC2', Angshuman Modak, 21 Mar 2023

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
AR by Angshuman Modak on behalf of the Authors (26 Mar 2023)  Author's response   Author's tracked changes   Manuscript 
ED: Referee Nomination & Report Request started (27 Mar 2023) by Matthew Lebsock
RR by Anonymous Referee #1 (10 Apr 2023)
RR by Tim Andrews (21 Apr 2023)
ED: Publish subject to minor revisions (review by editor) (25 Apr 2023) by Matthew Lebsock
AR by Angshuman Modak on behalf of the Authors (24 May 2023)  Author's response   Author's tracked changes   Manuscript 
ED: Publish as is (30 May 2023) by Matthew Lebsock
AR by Angshuman Modak on behalf of the Authors (02 Jun 2023)  Manuscript 

Journal article(s) based on this preprint

11 Jul 2023
Better-constrained climate sensitivity when accounting for dataset dependency on pattern effect estimates
Angshuman Modak and Thorsten Mauritsen
Atmos. Chem. Phys., 23, 7535–7549, https://doi.org/10.5194/acp-23-7535-2023,https://doi.org/10.5194/acp-23-7535-2023, 2023
Short summary
Angshuman Modak and Thorsten Mauritsen
Angshuman Modak and Thorsten Mauritsen

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Latest update: 19 Sep 2024
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Short summary
We estimate Equilibrium Climate Sensitivity, a metric to constrain future global warming based on the instrumental temperature record including the corrections for the effects on radiation balance caused by the pattern of surface temperature change- pattern effect. We address the uncertainty caused by the underlying sea surface temperature datasets used in the estimates of pattern effect. This together with the intermodel spread lifts the corresponding IPCC AR6 estimate to 3.1 K [1.7 to 9.2 K].