Articles | Volume 17, issue 21
Biogeosciences, 17, 5443–5463, 2020
https://doi.org/10.5194/bg-17-5443-2020
Biogeosciences, 17, 5443–5463, 2020
https://doi.org/10.5194/bg-17-5443-2020
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 et al.

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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.
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