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The use of branched glycerol dialkyl glycerol tetraethers (bGDGTs) inloess–palaeosol sequences (LPSs) has shown promises in continentalpalaeotemperature reconstructions. Thus far, however, little is known aboutthe effect of soil moisture on their distributions in the water-limitedChinese Loess Plateau (CLP). In this study, the relationships betweenenvironmental variables and the cyclization of branched tetraethers (CBT)were investigated in arid–subhumid China using 97 surface soils in the CLPand its vicinity, as well as 78 soils with pH > 7 which have beenpreviously published. We find that CBT correlates best with soil watercontent (SWC) or mean annual precipitation (MAP) for the overall data set.This indicates that CBT is mainly controlled by soil moisture instead ofsoil pH in alkaline soils from arid–subhumid regions, where wateravailability is a limiting factor for the producers of bGDGTs. Therefore, wesuggest that CBT can potentially be used as a palaeorainfall proxy on thealkaline CLP. According to the preliminary CBT–MAP relationship for modernCLP soils (CBT = −0.0021 × MAP + 1.7, n = 37, r = −0.93),palaeorainfall history was reconstructed from three LPSs (Yuanbao, Lantian,and Mangshan) with published bGDGT data spanning the past 70 ka. TheCBT-derived MAP records of the three sites consistently showprecession-driven variation resembling the monsoon record based onspeleothem δ18O, supporting CBT as a reasonable proxy forpalaeorainfall reconstruction in LPS. The direct application of CBT as apalaeorainfall proxy in corroboration with the bGDGT-based temperature proxymay enable us to further assess the temperature/hydrological association forpalaeoclimate studies on the CLP

biogeosciences

Dependence of the cyclization of branched tetraethers on soil moisture in alkaline soils from arid–subhumid China: implications for palaeorainfall reconstructions on the Chinese Loess Plateau