Articles | Volume 21, issue 11
https://doi.org/10.5194/bg-21-2877-2024
https://doi.org/10.5194/bg-21-2877-2024
Research article
 | 
14 Jun 2024
Research article |  | 14 Jun 2024

Disentangling influences of climate variability and lake-system evolution on climate proxies derived from isoprenoid and branched glycerol dialkyl glycerol tetraethers (GDGTs): the 250 kyr Lake Chala record

Allix J. Baxter, Francien Peterse, Dirk Verschuren, Aihemaiti Maitituerdi, Nicolas Waldmann, and Jaap S. Sinninghe Damsté

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Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-2486', Anonymous Referee #1, 13 Dec 2023
    • AC2: 'Reply on RC1', Allix Baxter, 19 Jan 2024
    • AC3: 'Reply on RC1', Allix Baxter, 19 Jan 2024
  • RC2: 'Comment on egusphere-2023-2486', Anonymous Referee #2, 30 Dec 2023
    • AC1: 'Reply on RC2', Allix Baxter, 19 Jan 2024

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
ED: Reconsider after major revisions (30 Jan 2024) by Cindy De Jonge
AR by Allix Baxter on behalf of the Authors (04 Mar 2024)  Author's response   Author's tracked changes   Manuscript 
ED: Publish subject to minor revisions (review by editor) (18 Mar 2024) by Cindy De Jonge
AR by Allix Baxter on behalf of the Authors (03 Apr 2024)  Author's response   Author's tracked changes   Manuscript 
ED: Publish as is (16 Apr 2024) by Cindy De Jonge
AR by Allix Baxter on behalf of the Authors (25 Apr 2024)  Manuscript 
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Short summary
This study investigates the impact of long-term lake-system evolution on the climate signal recorded by glycerol dialkyl glycerol tetraethers (GDGTs), a popular biomarker in paleoclimate research. It compares downcore changes in GDGTs in the 250 000 year sediment sequence of Lake Chala (Kenya/Tanzania) to independent data for lake mixing and water-column chemistry. These factors influence the GDGT proxies in the earliest depositional phases (before ~180 ka), confounding the climate signal.
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