Preprints
https://doi.org/10.5194/egusphere-2023-399
https://doi.org/10.5194/egusphere-2023-399
17 Mar 2023
 | 17 Mar 2023

Hysteresis and orbital pacing of the early Cenozoic Antarctic ice sheet

Jonas Van Breedam, Philippe Huybrechts, and Michel Crucifix

Abstract. The hysteresis behaviour of ice sheets arises because of the different thresholds for growth and decline of a continental-scale ice sheet depending on the initial conditions. In this study, the hysteresis effect of the early Cenozoic Antarctic ice sheet is investigated with an improved ice sheet-climate coupling method that accurately captures the ice-albedo feedback. It is shown that the hysteresis effect of the early Cenozoic Antarctic ice sheet is about ~180 ppmv or between 3.5 °C and 5.5 °C, depending only weakly on the bedrock elevation dataset. Excluding the solid Earth feedback decreases the hysteresis effect significantly towards ~40 ppmv, because the transition to a glacial state can occur at a higher forcing. The rapid transition from a glacial to a deglacial state and oppositely from deglacial to glacial conditions is strongly enhanced by the ice-albedo feedback, in combination with the elevation – surface mass balance feedback. Variations in the orbital parameters show that extreme values of the orbital parameters are able to exceed the threshold in summer insolation to induce a (de)glaciation. It appears that the long-term eccentricity cycle has a large influence on the ice sheet growth and decline and is able to pace the ice sheet evolution for constant CO2 concentration close to the glaciation threshold.

Journal article(s) based on this preprint

14 Dec 2023
Hysteresis and orbital pacing of the early Cenozoic Antarctic ice sheet
Jonas Van Breedam, Philippe Huybrechts, and Michel Crucifix
Clim. Past, 19, 2551–2568, https://doi.org/10.5194/cp-19-2551-2023,https://doi.org/10.5194/cp-19-2551-2023, 2023
Short summary

Jonas Van Breedam 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-2023-399', Anonymous Referee #1, 04 Apr 2023
  • RC2: 'Comment on egusphere-2023-399', Anonymous Referee #2, 19 Apr 2023

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-399', Anonymous Referee #1, 04 Apr 2023
  • RC2: 'Comment on egusphere-2023-399', Anonymous Referee #2, 19 Apr 2023

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
ED: Reconsider after major revisions (04 Aug 2023) by Irina Rogozhina
AR by Jonas Van Breedam on behalf of the Authors (17 Aug 2023)  Author's response   Author's tracked changes   Manuscript 
ED: Referee Nomination & Report Request started (15 Sep 2023) by Irina Rogozhina
RR by Anonymous Referee #1 (22 Sep 2023)
RR by Anonymous Referee #2 (11 Oct 2023)
ED: Publish subject to technical corrections (28 Oct 2023) by Irina Rogozhina
AR by Jonas Van Breedam on behalf of the Authors (04 Nov 2023)  Author's response   Manuscript 

Journal article(s) based on this preprint

14 Dec 2023
Hysteresis and orbital pacing of the early Cenozoic Antarctic ice sheet
Jonas Van Breedam, Philippe Huybrechts, and Michel Crucifix
Clim. Past, 19, 2551–2568, https://doi.org/10.5194/cp-19-2551-2023,https://doi.org/10.5194/cp-19-2551-2023, 2023
Short summary

Jonas Van Breedam et al.

Jonas Van Breedam 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
We investigated the different boundary conditions to allow for ice sheet growth and ice sheet decline of the Antarctic ice sheet when it appeared ~34 Ma ago. The thresholds for ice sheet growth and decline differ because of the different climatological conditions above an ice sheet (higher elevation and higher albedo) compared to a bare topography. We found that the ice-albedo feedback and the isostasy feedback respectively ease and delay the transition from a deglacial to glacial state.