Abstract
The degree of methylation and cyclization of bacteria-derived branched glycerol dialkyl glycerol tetraether (GDGT) membrane
lipids in soils depends on temperature and soil pH. Expressed in the methylation index of branched tetraethers (MBT)
and cyclization ratio of branched tetraethers (CBT), these relationships are used to reconstruct past annual mean air temperature
(MAT) based
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