The effect of greenhouse gas concentrations and ice sheets on the glacial AMOC in a coupled climate model

Klockmann, Marlene; Mikolajewicz, Uwe; Marotzke, Jochem

doi:https://doi.org/10.5194/cp-12-1829-2016

Articles | Volume 12, issue 9

https://doi.org/10.5194/cp-12-1829-2016

© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

https://doi.org/10.5194/cp-12-1829-2016

© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 12, issue 9

Research article

|

08 Sep 2016

Research article |

| 08 Sep 2016

The effect of greenhouse gas concentrations and ice sheets on the glacial AMOC in a coupled climate model

Marlene Klockmann, Uwe Mikolajewicz, and Jochem Marotzke

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Final revised paper (published on 08 Sep 2016)
Preprint (discussion started on 27 Apr 2016)

Interactive discussion

Status: closed

AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment

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RC1: 'Very good contribution to glacial climate models.', Anonymous Referee #1, 05 May 2016
RC2: 'Comments on “The effect of greenhouse gas concentrations and ice sheets on the glacial AMOC in a coupled climate model” by Marlene Klockmann, Uwe Mikolajewicz, and Jochem Marotzke.', Anonymous Referee #2, 20 Jun 2016
AC1: 'Author Comment - final response', Marlene Klockmann, 18 Jul 2016

Peer-review completion

AR: Author's response | RR: Referee report | ED: Editor decision

ED: Publish subject to minor revisions (review by Editor) (20 Jul 2016) by André Paul

AR by Marlene Klockmann on behalf of the Authors (28 Jul 2016) Author's response Manuscript

ED: Publish subject to technical corrections (09 Aug 2016) by André Paul

Short summary

We study the response of the glacial AMOC to different forcings in a coupled AOGCM. The depth of the upper overturning cell remains almost unchanged in response to the full glacial forcing. This is the result of two opposing effects: a deepening due to the ice sheets and a shoaling due to the low GHG concentrations. Increased brine release in the Southern Ocean is key to the shoaling. With glacial ice sheets, a shallower cell can be simulated with GHG concentrations below the glacial level.