Soil chemistry, temperature and bacterial community composition drive brGDGT distributions along a subarctic elevation gradient ...

Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are bacterial membrane lipids which can be used to reconstruct past terrestrial mean annual air temperature (MAAT) and soil pH values. To reconstruct these environmental conditions in geological archives, we make use of the brGDGT ratios MBTʹ5...

Full description

Bibliographic Details
Main Authors: Halffman, Robin, Lembrechts, Jonas, Radujković, Dajana, De Gruyter, Johan, Nijs, Ivan, De Jonge, Cindy
Format: Text
Language:English
Published: ETH Zurich 2022
Subjects:
brGDGT
Biomarker proxy
Bacterial community
Soil biomarkers
Subarctic
Online Access:https://dx.doi.org/10.3929/ethz-b-000521417
http://hdl.handle.net/20.500.11850/521417
Description
Summary:Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are bacterial membrane lipids which can be used to reconstruct past terrestrial mean annual air temperature (MAAT) and soil pH values. To reconstruct these environmental conditions in geological archives, we make use of the brGDGT ratios MBTʹ5ME, CBTʹ and IR, which summarize the structural variation in brGDGT lipids. However, the most recent calibrations between the brGDGT-based temperature proxy MBTʹ5ME and temperature on a global scale are characterized by a residual error between 3.8 °C and 6.0 °C. This lack of accuracy of the MBTʹ5ME-MAAT calibration is often attributed to the difference between soil and atmospheric temperatures. Also, previous studies suggested that the variation of the MBTʹ5ME along chemistry and temperature gradients reflects a possible influence of bacterial community changes. Here, we analyzed the effect environmental variables have on brGDGT signatures collected along five elevation gradients in the north of Sweden and ... : Organic Geochemistry, 163 ...

Similar Items