Paleoceanography and ice sheet variability offshore Wilkes Land, Antarctica – Part 2: Insights from Oligocene–Miocene dinoflagellate cyst assemblages

Bijl, Peter K.; Houben, Alexander J. P.; Hartman, Julian D.; Pross, Jörg; Salabarnada, Ariadna; Escutia, Carlota; Sangiorgi, Francesca

doi:https://doi.org/10.5194/cp-14-1015-2018

Articles | Volume 14, issue 7

https://doi.org/10.5194/cp-14-1015-2018

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

Special issue:

Publications by EGU Medallists

https://doi.org/10.5194/cp-14-1015-2018

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

Articles | Volume 14, issue 7

Research article

|

11 Jul 2018

Research article |

| 11 Jul 2018

Paleoceanography and ice sheet variability offshore Wilkes Land, Antarctica – Part 2: Insights from Oligocene–Miocene dinoflagellate cyst assemblages

Peter K. Bijl, Alexander J. P. Houben, Julian D. Hartman, Jörg Pross, Ariadna Salabarnada, Carlota Escutia, and Francesca Sangiorgi

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Final revised paper (published on 11 Jul 2018)
Supplement to the final revised paper
Preprint (discussion started on 05 Dec 2017)
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: 'Revision of manuscript cp-2017-148', Kasia K. Sliwinska, 29 Jan 2018
- AC1: 'Response to Reviewer 1, Kasia Śliwińska, by Bijl et al.', Peter Bijl, 10 Apr 2018
- AC2: 'response to reviewer 2 by Bijl et al.', Peter Bijl, 10 Apr 2018
RC2: 'Bijl et al. ms general review comments', Anonymous Referee #2, 01 Mar 2018
- AC2: 'response to reviewer 2 by Bijl et al.', Peter Bijl, 10 Apr 2018
- AC1: 'Response to Reviewer 1, Kasia Śliwińska, by Bijl et al.', Peter Bijl, 10 Apr 2018
RC3: 'Review of Bijl et al paper', Stephen Gallagher, 14 Mar 2018
- AC3: 'Response to R3 by Bijl et al.', Peter Bijl, 10 Apr 2018

Peer-review completion

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

ED: Reconsider after major revisions (30 Apr 2018) by David Thornalley

AR by Peter Bijl on behalf of the Authors (09 May 2018) Author's response Manuscript

ED: Referee Nomination & Report Request started (14 May 2018) by David Thornalley

RR by Anonymous Referee #2 (19 Jun 2018)

Suggestions for revision or reasons for rejection

Oligocene-Miocene paloceanography off the Wilkes Land margin (East Antarctica) based on organic-walled dinoflagellate cysts.
Bijl et al.
Climate Past
Review 19 Jun 2018
This paper is significantly improved from the version I read earlier this year. The main comments I had then, on the description of the environmental affiliations of Selenopemphix antarctica and its abundance in the Wilkes Land record, the illustration/identification of glacial-interglacial scale variability in the dinocyst dataset, and the reliance on (at that time) an unpublished manuscript, have all been addressed.
Comment on Fig 4, Fig 5 – given the very different environmental interpretations the authors place on Selenopemphix antarctica and Selenopemphix spp., they might wish to consider plotting these separately in both figures. Also consider repeating the relevant parts of fig 4 key in fig 5 for ease of interpretation.
Comment on Fig 6 – is now much clearer – but still somewhat difficult to read, partly because the ‘absolute abundance’ scales must change so much between the different groups – perhaps plot all on log scale? Also consider splitting the absolute abundance and relative abundance results into two parallel columns - to make consideration of glacial/interglacial changes more easy for the reader.
Comment on Fig 7 – also now much clearer. Just for ease of reading small font, I suggest the authors turn the figure into a full page grid of 4*4 graphs, and perhaps highlight the forms the authors believe are indicative of sea ice.
Comment onTable 1 – suggest make FO/LO column either FO/LO rather than “(o)” or “(y)”, and not clear if word “Genus” is needed in column heading “Genus,chron”

This is an interesting paper, and the dataset is important. It will be of interest to the research community.

My apologies for the slightly late return of this review.

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ED: Publish subject to technical corrections (21 Jun 2018) by David Thornalley

AR by Peter Bijl on behalf of the Authors (26 Jun 2018) Author's response Manuscript

Short summary

We document Southern Ocean surface ocean conditions and changes therein during the Oligocene and Miocene (34–10 Myr ago). We infer profound long-term and short-term changes in ice-proximal oceanographic conditions: sea surface temperature, nutrient conditions and sea ice. Our results point to warm-temperate, oligotrophic, ice-proximal oceanographic conditions. These distinct oceanographic conditions may explain the high amplitude in inferred Oligocene–Miocene Antarctic ice volume changes.