Increasing vertical mixing to reduce Southern Ocean deep convection in NEMO3.4

Heuzé, C.; Ridley, J. K.; Calvert, D.; Stevens, D. P.; Heywood, K. J.

doi:https://doi.org/10.5194/gmd-8-3119-2015

Articles | Volume 8, issue 10

https://doi.org/10.5194/gmd-8-3119-2015

© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue:

Nucleus for European Modelling of the Ocean - NEMO

https://doi.org/10.5194/gmd-8-3119-2015

© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 8, issue 10

Development and technical paper

|

06 Oct 2015

Development and technical paper |

| 06 Oct 2015

Increasing vertical mixing to reduce Southern Ocean deep convection in NEMO3.4

C. Heuzé, J. K. Ridley, D. Calvert, D. P. Stevens, and K. J. Heywood

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Final revised paper (published on 06 Oct 2015)
Preprint (discussion started on 17 Mar 2015)
Supplement to the preprint

Interactive discussion

Status: closed

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

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- Supplement

RC C827: 'general review', Anonymous Referee #1, 20 May 2015
- AC C1362: 'Response to Anonymous referee 1', Céline Heuzé, 15 Jul 2015
SC C983: 'Executive Editor Comment on "Increasing vertical mixing to reduce Southern Ocean deep convection in NEMO"', Astrid Kerkweg, 05 Jun 2015
- AC C1383: 'Response to the Executive Editor comment', Céline Heuzé, 15 Jul 2015
RC C1027: 'Review of gmd-2015-36', Anonymous Referee #2, 08 Jun 2015
- AC C1386: 'Response to Anonymous referee 2', Céline Heuzé, 15 Jul 2015

Peer-review completion

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

AR by Céline Heuzé on behalf of the Authors (17 Jul 2015) Author's response Manuscript

ED: Referee Nomination & Report Request started (21 Jul 2015) by R. Marsh

RR by Anonymous Referee #2 (31 Jul 2015)

ED: Publish subject to minor revisions (Editor review) (09 Aug 2015) by R. Marsh

AR by Céline Heuzé on behalf of the Authors (15 Sep 2015) Author's response

ED: Publish as is (27 Sep 2015) by R. Marsh

AR by Céline Heuzé on behalf of the Authors (27 Sep 2015)

Short summary

Most ocean models, including NEMO, have unrealistic Southern Ocean deep convection. That is, through extensive areas of the Southern Ocean, they exhibit convection from the surface of the ocean to the sea floor. We find this convection to be an issue as it impacts the whole ocean circulation, notably strengthening the Antarctic Circumpolar Current. Using sensitivity experiments, we show that counter-intuitively the vertical mixing needs to be enhanced to reduce this spurious convection.