Last interglacial ocean changes in the Bahamas: climate teleconnections between low and high latitudes

Zhuravleva, Anastasia; Bauch, Henning A.

doi:https://doi.org/10.5194/cp-14-1361-2018

Articles | Volume 14, issue 10

https://doi.org/10.5194/cp-14-1361-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/cp-14-1361-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 14, issue 10

Research article

|

01 Oct 2018

Research article |

| 01 Oct 2018

Last interglacial ocean changes in the Bahamas: climate teleconnections between low and high latitudes

Anastasia Zhuravleva and Henning A. Bauch

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Final revised paper (published on 01 Oct 2018)
Preprint (discussion started on 11 Apr 2018)

Interactive discussion

Status: closed

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

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- Supplement

RC1: 'Review of “The last interglacial (MIS 5e) cycle at Little Bahama Bank: A history of climate and sea-level changes”', André Bahr, 30 Apr 2018
- AC1: 'Author´s response to the comments of A. Bahr (Referee)', Anastasia Zhuravleva, 12 Jul 2018
RC2: 'Zhuravleva and Bauch “The last interglacial (MIS5e) cycle at Little Bahama Bank: A history of climate and sea-level changes”.', Anonymous Referee #2, 17 May 2018
- AC2: 'Author´s response to the comments of the Anonymous Referee #2', Anastasia Zhuravleva, 12 Jul 2018

Peer-review completion

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

ED: Reconsider after major revisions (19 Jul 2018) by Alessio Rovere

AR by Anastasia Zhuravleva on behalf of the Authors (19 Jul 2018) Author's response

ED: Referee Nomination & Report Request started (20 Jul 2018) by Alessio Rovere

RR by Anonymous Referee #2 (16 Aug 2018)

Suggestions for revision or reasons for rejection

Zhuravleva and Bauch “Last Interglacial ocean changes in the Bahamas: climate and teleconnections between the low and high latitudes”.

The revised manuscript is much improved, with a much sharper focus, discussion (including mechanisms, as requested by both reviewers) and conclusions. The paper provides an excellent record of the evolution of hydrographic conditions at the Little Bahama Bank (LBB) for Termination II (TII) and the Last Interglacial (LIg), reflecting both the insolation driven and AMOC modulated migration of the ITCZ.

The paper will make a good contribution to the journal, providing high-resolution evidence of teleconnections between the low and high latitudes for TII and the LIg. Based on the revised manuscript, I would recommend publication subject to some minor revisions/technical corrections.

Comments:
Platform sedimentology and sea level: This section is much improved. However, I would consider removing lines 251 to 256, this really doesn’t add anything. You wouldn’t expect to be able to resolve intra-LIg sea level variations from your data.

line 259: consider using “elevated” rather than “high proportions” – the percentages are still very low (<10% and < 2% for G. inflata and G. truncatulinoides (dex.), respectively).

line 280: change “reversion” (in what???) to “oscillation” and clarify what you are referring to (surface hydrographic conditions?)

Mechanisms influencing changing faunal abundances: Reviewer 1 requested clarification that water column stratification is not the only influence upon the abundance of G. truncatulinoides (dex.). This has not been addressed by the authors (lines 293 to 301). I agree with the authors interpretation, however, there should be an acknowledgment of alternative explanations. This could be easily fixed in line 293/294 with brackets.

Use of “Younger Dryas-type event”: I am averse to this terminology, given the very different ‘background states’ for the two events. This is a personal view and the authors do highlight this (line 379 to 381).

Technical corrections:
line 217: change “unstable” to “variable”.
Figures
1. Figure captions for figures 3 to 6 – please state what the dashed vertical lines are.
2. Figure 4: I found this rather hard to read. Could you use other colours other than black and blue?
3. Figure 4: either the vertical dashed line or the shaded blue bar at 131 ka is not vertical – please fix.
4. Figure 4: the max. tick marks for the vertical axis for % G. inflata is missing – please add.
5. Figure 4: Please add what the vertical blue bars indicate to the caption.
6. Figure 5: consider adding the blue bars of the stratification/cooling events at 131 ka and 127 ka

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ED: Publish subject to minor revisions (review by editor) (20 Aug 2018) by Alessio Rovere

AR by Anastasia Zhuravleva on behalf of the Authors (29 Aug 2018) Author's response Manuscript

ED: Publish subject to technical corrections (10 Sep 2018) by Alessio Rovere

AR by Anastasia Zhuravleva on behalf of the Authors (13 Sep 2018) Manuscript

Short summary

New foraminiferal data from the Bahama region are used to investigate the mechanisms regulating subtropical climate. Our results suggest that the sensitivity of the low-latitude climate increased at times of enhanced sea-surface freshening in the subpolar North Atlantic. This has further implications for future climate development, given the ongoing melting of the Greenland ice sheet.