A South Atlantic island record uncovers shifts in westerlies and hydroclimate during the last glacial

Björck, Svante; Sjolte, Jesper; Ljung, Karl; Adolphi, Florian; Flower, Roger; Smittenberg, Rienk H.; Kylander, Malin E.; Stocker, Thomas F.; Holmgren, Sofia; Jiang, Hui; Muscheler, Raimund; Afrifa, Yamoah K. K.; Rattray, Jayne E.; Van der Putten, Nathalie

doi:https://doi.org/10.5194/cp-15-1939-2019

Articles | Volume 15, issue 6

https://doi.org/10.5194/cp-15-1939-2019

© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/cp-15-1939-2019

© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 15, issue 6

Research article

|

15 Nov 2019

Research article |

| 15 Nov 2019

A South Atlantic island record uncovers shifts in westerlies and hydroclimate during the last glacial

Svante Björck, Jesper Sjolte, Karl Ljung, Florian Adolphi, Roger Flower, Rienk H. Smittenberg, Malin E. Kylander, Thomas F. Stocker, Sofia Holmgren, Hui Jiang, Raimund Muscheler, Yamoah K. K. Afrifa, Jayne E. Rattray, and Nathalie Van der Putten

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Final revised paper (published on 15 Nov 2019)
Supplement to the final revised paper
Preprint (discussion started on 11 Jun 2019)
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

RC1: 'comment on Björck et al. for CP', Anonymous Referee #1, 04 Jul 2019
- AC1: 'Replies to ref#1', Svante Björck, 22 Aug 2019
RC2: 'Reviewer copmments', Anonymous Referee #2, 31 Jul 2019
- AC2: 'Replies to Ref #2', Svante Björck, 22 Aug 2019

Peer-review completion

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

ED: Publish subject to minor revisions (review by editor) (25 Aug 2019) by Julie Loisel

AR by Svante Björck on behalf of the Authors (02 Sep 2019) Author's response Manuscript

ED: Publish as is (20 Sep 2019) by Julie Loisel

AR by Svante Björck on behalf of the Authors (23 Sep 2019)

Short summary

Southern Hemisphere westerlies play a key role in regulating global climate. A lake sediment record on a mid-South Atlantic island shows changes in the westerlies and hydroclimate 36.4–18.6 ka. Before 31 ka the westerlies shifted in concert with the bipolar seesaw mechanism in a fairly warm climate, followed by southerly westerlies and falling temperatures. After 27.5 ka temperatures dropped 3 °C with drier conditions and with shifting westerlies possibly triggering the variable LGM CO₂ levels.