Global compilation of brGDGT lipid distributions, temperature, and pH across a dozen sample types@en

Lipid and environmental data were compiled from previously published datasets of modern samples that used the most recent chromatographic methods that separate 5- and 6-methyl isomers. The compiled dataset (n = 3129) consisted of bone (n = 202), groundwater (n = 7), lake water meso/microcosm (n = 36), lake surface sediment (n = 343), lake water SPM (n = 228, including sediment traps (n = 115) and water filtrates (n = 113)), low DO lake water SPM (n = 138, including sediment traps (n = 29) and water filtrates (n = 109)), authigenic carbonates from a marine methane cold seep (n = 13), marine surface sediment (n = 325, including deep ocean trench sediments (n = 31)), marine SPM (water filtrates, n = 25), peat (n = 473), riverine surface sediments (n = 71) and SPM (water filtrates, n = 85), and soil (n = 1183, including permafrost active layer (n = 17)). Data from other sample media, including hot springs, speleothems, and hydrothermal vents, could not be included as these studies did not separate the 5- and 6-methyl isomers. Fractional abundances (FAs) were calculated according to Raberg et al., (2021). […]