Seasonal variability and sources of in situ brGDGT production in a permanently stratified African crater lake

van Bree, Loes G. J.; Peterse, Francien; Baxter, Allix J.; De Crop, Wannes; van Grinsven, Sigrid; Villanueva, Laura; Verschuren, Dirk; Sinninghe Damsté, Jaap S.

doi:https://doi.org/10.5194/bg-17-5443-2020

Articles | Volume 17, issue 21

https://doi.org/10.5194/bg-17-5443-2020

© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/bg-17-5443-2020

© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 17, issue 21

Research article

|

13 Nov 2020

Research article |

| 13 Nov 2020

Seasonal variability and sources of in situ brGDGT production in a permanently stratified African crater lake

Loes G. J. van Bree, Francien Peterse, Allix J. Baxter, Wannes De Crop, Sigrid van Grinsven, Laura Villanueva, Dirk Verschuren, and Jaap S. Sinninghe Damsté

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Final revised paper (published on 13 Nov 2020)
Preprint (discussion started on 28 Jul 2020)
Supplement to the preprint

Interactive discussion

Status: closed

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

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RC1: 'Review of “Seasonal variability and sources of in situ brGDGT production in a permanently stratified African crater lake” by van Bree et al submitted to Biogeosciences Discussions', Anonymous Referee #1, 25 Aug 2020
- AC1: 'Author reply to referee #1', Francien Peterse, 14 Sep 2020
RC2: 'Review of "Seasonal variability and sources of in situ brGDGT production in a permanently stratified African crater lake"', Anonymous Referee #2, 10 Sep 2020
- AC2: 'Author reply to referee #2', Francien Peterse, 14 Sep 2020

Peer-review completion

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

ED: Publish subject to minor revisions (review by editor) (14 Sep 2020) by Steven Bouillon

AR by Francien Peterse on behalf of the Authors (21 Sep 2020) Author's response Manuscript

ED: Publish as is (05 Oct 2020) by Steven Bouillon

AR by Francien Peterse on behalf of the Authors (05 Oct 2020) Manuscript

Short summary

Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are used as a paleothermometer based on their temperature dependence in global soils, but aquatic production complicates their use in lakes. BrGDGTs in the water column of Lake Chala, East Africa, respond to oxygen conditions and mixing. Changes in their signal can be linked to bacterial community composition rather than membrane adaptation to changing conditions. Their integrated signal in the sediment reflects mean air temperature.