Articles | Volume 18, issue 12
https://doi.org/10.5194/bg-18-3579-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-18-3579-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
17 Jun 2021
Research article |
| 17 Jun 2021
| 17 Jun 2021
Revised fractional abundances and warm-season temperatures substantially improve brGDGT calibrations in lake sediments
Jonathan H. Raberg
CORRESPONDING AUTHOR
Department of Geological Sciences and Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO 80309, USA
Faculty of Earth Sciences, University of Iceland, Reykjavík, Iceland
David J. Harning
Department of Geological Sciences and Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO 80309, USA
Faculty of Earth Sciences, University of Iceland, Reykjavík, Iceland
Sarah E. Crump
Department of Geological Sciences and Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO 80309, USA
currently at: Ecology and Evolutionary Biology Department, University of California Santa Cruz, Santa Cruz, CA 95064, USA
Greg de Wet
Department of Geological Sciences and Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO 80309, USA
currently at: Department of Geosciences, Smith College, Northampton, MA 01063, USA
Aria Blumm
Department of Geological Sciences and Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO 80309, USA
currently at: Department of Geosciences, University of Arizona, Tucson, AZ 85721, USA
Sebastian Kopf
Department of Geological Sciences and Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO 80309, USA
Áslaug Geirsdóttir
Faculty of Earth Sciences, University of Iceland, Reykjavík, Iceland
Gifford H. Miller
Department of Geological Sciences and Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO 80309, USA
Julio Sepúlveda
Department of Geological Sciences and Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO 80309, USA
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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.
BrGDGT lipids are a proxy for temperature in lake sediments, but other parameters like pH can...
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