Organic Geochemistry

Comparison between automated and manual Solid phase extraction method for lipids.

Supplemental data 1: The fractional abundance of brGDGT and soil environmental variables from Tibetan soils (Table 1); the fractional abundance of brGDGT and vegetation information from published global soil dataset (Table 2). Supplemental data 2: Map of global soil database with colors for different vegetation types. Yellow and red circle are global brGDGT data points. Only red circle sites are used in vegetation tests.

Long chain alkyl diols (LCDs) in marine environments are useful to reflect source organism, ambient temperature, upwelling and nutrient conditions. However, the distribution of LCDs in the western Pacific marginal seas has been rarely reported, where wide shallow continental shelves and huge freshwater input from many rivers occur. In this study, we analyzed LCDs in surface sediments distributed from the Changjiang River estuary (CRE) to the East China Sea shelf to evaluate their sources and associated environmental proxies. Our results showed that the fractional abundance of C32 1,15-diol (FC32 1,15-diol) was highest in coastal area close to the CRE, with FC32 1,15-diol >15% implying significant freshwater input. The C28 and C30 1,13-diols showed a similar spatial distribution to C32 1,15-diol, suggesting the long chain diol index (LDI), a sea surface temperature (SST) proxy, may be biased by freshwater derived diols. By excluding the freshwater-influenced samples (i.e., FC32 1,15-diol >15%), LDI reflected best the autumn SST, yielding minimum temperature residuals (0.2 ± 1.5 °C). The C28, C30 and C30:1 1,14-diols were abundant in the mid-depth (15–45 m) offshore environment affected slightly by the Changjiang River plume, and decreased toward both the eutrophic estuarine and oligotrophic marine environments; whereas C28:1 1,14-diol showed higher fractional abundances close to the CE, which remains elusive. The distribution pattern of 1,14-diols is similar to the reported Proboscia diatom distribution in this region, although exact sources of 1,14-diol are pending to further study. Nutrient proxies based on 1,14-diols did not correlate well with nutrient concentrations in this river-dominated marginal sea, where nutrient supply is dominated by the Changjiang River input.

This dataset is about GDGT biomarkers in surface sediment from three Pacific trenches

Supplementary material containing all data tables used in this study

Compound- specific stable carbon and hydrogen isotope data of long-chain n-alkanes, short- and long-chain fatty acids and alkenones from cores GeoB7805-1 2 and GeoB7807-2 from the Shaban Deep in the northern Red Sea. Radiocarbon data from planktic foraminifera from cores GeoB7805-1 2 and GeoB7807-2 from the Shaban Deep in the northern Red Sea

Sample information and geochemical parameters discussed in the study

The data sheet include the GC and Rockeval data before and after the solvent flow-through experiment in a lacustrine shale oil system in China.

compound concentrations and concentration/intensity ratios

Sulfur multi-pool, multi-isotope analyses from various natural samples.