Articles | Volume 18, issue 12
https://doi.org/10.5194/bg-18-3579-2021
https://doi.org/10.5194/bg-18-3579-2021
Research article
 | 
17 Jun 2021
Research article |  | 17 Jun 2021

Revised fractional abundances and warm-season temperatures substantially improve brGDGT calibrations in lake sediments

Jonathan H. Raberg, David J. Harning, Sarah E. Crump, Greg de Wet, Aria Blumm, Sebastian Kopf, Áslaug Geirsdóttir, Gifford H. Miller, and Julio Sepúlveda

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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 bg-2021-16', Anonymous Referee #1, 15 Feb 2021
    • AC1: 'Reply on RC1', Jonathan Raberg, 02 Apr 2021
  • RC2: 'Comment on bg-2021-16', Anonymous Referee #2, 15 Feb 2021
    • AC2: 'Reply on RC2', Jonathan Raberg, 02 Apr 2021
  • EC1: 'Comment on bg-2021-16', Sebastian Naeher, 28 Feb 2021
    • AC3: 'Reply on EC1', Jonathan Raberg, 02 Apr 2021

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
ED: Publish subject to minor revisions (review by editor) (17 Apr 2021) by Sebastian Naeher
AR by Jonathan Raberg on behalf of the Authors (29 Apr 2021)  Author's response   Author's tracked changes   Manuscript 
EF by Sarah Buchmann (30 Apr 2021)  Supplement 
ED: Publish as is (02 May 2021) by Sebastian Naeher
AR by Jonathan Raberg on behalf of the Authors (10 May 2021)
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Short summary
BrGDGT lipids are a proxy for temperature in lake sediments, but other parameters like pH can influence them, and seasonality can affect the temperatures they record. We find a warm-season bias at 43 new high-latitude sites. We also present a new method that deconvolves the effects of temperature, pH, and conductivity and generate global calibrations for these variables. Our study provides new paleoclimate tools, insight into brGDGTs at the biochemical level, and a new method for future study.
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