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

Related authors

Moss kill-dates and modeled summer temperature track episodic snowline lowering and ice-cap expansion in Arctic Canada through the Common Era
Gifford H. Miller, Simon L. Pendleton, Alexandra Jahn, Yafang Zhong, John T. Andrews, Scott J. Lehman, Jason P. Briner, Jonathan H. Raberg, Helga Bueltmann, Martha Raynolds, Áslaug Geirsdóttir, and John R. Southon
EGUsphere, https://doi.org/10.5194/egusphere-2023-737,https://doi.org/10.5194/egusphere-2023-737, 2023
This preprint is open for discussion and under review for Climate of the Past (CP).
Short summary

Related subject area

Biogeochemistry: Organic Biogeochemistry
Recently fixed carbon fuels microbial activity several meters below the soil surface
Andrea Scheibe, Carlos A. Sierra, and Marie Spohn
Biogeosciences, 20, 827–838, https://doi.org/10.5194/bg-20-827-2023,https://doi.org/10.5194/bg-20-827-2023, 2023
Short summary
Distributions of bacteriohopanepolyols in lakes and coastal lagoons of the Azores Archipelago
Nora Richter, Ellen C. Hopmans, Danica Mitrović, Pedro M. Raposeiro, Vítor Gonçalves, Ana C. Costa, Linda A. Amaral-Zettler, Laura Villanueva, and Darci Rush
Biogeosciences Discuss., https://doi.org/10.5194/bg-2023-29,https://doi.org/10.5194/bg-2023-29, 2023
Revised manuscript accepted for BG
Short summary
Environmental and hydrologic controls on sediment and organic carbon export from a subalpine catchment: insights from a time series
Melissa Sophia Schwab, Hannah Gies, Chantal Valérie Freymond, Maarten Lupker, Negar Haghipour, and Timothy Ian Eglinton
Biogeosciences, 19, 5591–5616, https://doi.org/10.5194/bg-19-5591-2022,https://doi.org/10.5194/bg-19-5591-2022, 2022
Short summary
Climate and geology overwrite land use effects on soil organic nitrogen cycling on a continental scale
Lisa Noll, Shasha Zhang, Qing Zheng, Yuntao Hu, Florian Hofhansl, and Wolfgang Wanek
Biogeosciences, 19, 5419–5433, https://doi.org/10.5194/bg-19-5419-2022,https://doi.org/10.5194/bg-19-5419-2022, 2022
Short summary
Potential bioavailability of pyrogenic organic matter resembles natural dissolved organic matter pools
Emily B. Graham, Hyun-Seob Song, Samantha Grieger, Vanessa Garayburu-Caruso, James Stegen, Kevin D. Bladon, and Allison Myers-Pigg
EGUsphere, https://doi.org/10.5194/egusphere-2022-194,https://doi.org/10.5194/egusphere-2022-194, 2022
Short summary

Cited articles

Baxter, A. J., Hopmans, E. C., Russell, J. M., and Sinninghe Damsté, J. S.: Bacterial GMGTs in East African lake sediments: Their potential as palaeotemperature indicators, Geochim. Cosmochim. Ac., 259, 155–169, https://doi.org/10.1016/j.gca.2019.05.039, 2019. 
Beales, N.: Adaptation of Microorganisms to Cold Temperatures, Weak Acid Preservatives, Low pH, and Osmotic Stress: A Review, Compr. Rev. Food Sci. F., 3, 1–20, https://doi.org/10.1111/j.1541-4337.2004.tb00057.x, 2004. 
Buckles, L. K., Weijers, J. W. H., Verschuren, D., and Sinninghe Damsté, J. S.: Sources of core and intact branched tetraether membrane lipids in the lacustrine environment: Anatomy of Lake Challa and its catchment, equatorial East Africa, Geochim. Cosmochim. Ac., 140, 106–126, https://doi.org/10.1016/j.gca.2014.04.042, 2014. 
Cao, J., Rao, Z., Jia, G., Xu, Q., and Chen, F.: A 15 ka pH record from an alpine lake in north China derived from the cyclization ratio index of aquatic brGDGTs and its paleoclimatic significance, Org. Geochem., 109, 31–46, https://doi.org/10.1016/j.orggeochem.2017.02.005, 2017. 
Cao, J., Rao, Z., Shi, F., and Jia, G.: Ice formation on lake surfaces in winter causes warm-season bias of lacustrine brGDGT temperature estimates, Biogeosciences, 17, 2521–2536, https://doi.org/10.5194/bg-17-2521-2020, 2020. 
Download
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.
Altmetrics
Final-revised paper
Preprint