Global calibration of novel 3-hydroxy fatty acid based temperature and pH proxies
| Autor: | Afrifa Yamoah, Yi Yang, Sarah E. Greene, Canfa Wang, James A Bendle, Amy Thorpe, Shucheng Xie, Ilya Mandel, Junhua Huang, Alice Hardman, Huan Yang |
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| Rok vydání: | 2021 |
| Předmět: |
010504 meteorology & atmospheric sciences
Soil test Chemistry Relative distribution 010502 geochemistry & geophysics 01 natural sciences Linear relationship Geochemistry and Petrology Environmental chemistry Air temperature Soil water Calibration Hydroxy fatty acid Transect 0105 earth and related environmental sciences |
| Zdroj: | Geochimica et Cosmochimica Acta. 302:101-119 |
| ISSN: | 0016-7037 |
| Popis: | 3-Hydroxy fatty acids (3-OH-FAs), derived from Gram-negative bacterial outer membranes, have received recent attention for their potential as new terrestrial pH and temperature proxies for palaeoclimate studies. Initial studies from altitudinal transects of contemporary soils – correlating bacterial 3-OH-FA compositions to air temperature and pH – have shown promising results. But the geographical extent of recent calibrations is limited. In this study, we analyse 3-OH-FA lipid distributions in 186 globally distributed soil samples to study the environmental factors controlling the relative distribution of the 3-OH-FA isomers. Our sample-set covers a wide range of temperatures (−0.4 to 27 °C) and pH (3.6–9.2). For the global compilation we find that the ratio of anteiso to normal 3-OH-FAs of the C15 or C17 homologues (RAN15 or RAN17) shows a strong linear relationship with mean annual air temperature (MAAT) (R2 = 0.48, p |
| Databáze: | OpenAIRE |
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