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The ubiquitous occurrence of branched glycerol dialkyl glycerol tetraethers (brGDGTs) in soils has allowed development of new proxies for reconstruction of past climate and environment. The methylation and cyclization degrees of brGDGTs, expressed as MBT and CBT, respectively, are reported to be mainly controlled by mean annual air temperature (MAAT) and soil pH. However, the brGDGT-derived temperatures...
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