Compound-specific hydrogen and oxygen isotope analyzes on leaf wax-derived n-alkanes (δ²H_n–alkane) and the hemicellulose-derived sugar arabinose (δ¹⁸O_ara) are valuable, innovative tools for paleohydrological reconstructions. Previous calibration studies have revealed that δ²H_n–alkane and δ¹⁸O_ara reflect the isotopic composition of precipitation, but – depending on the region – may be strongly modulated by evapotranspirative enrichment. Since no calibration studies exist for semi-arid and arid Mongolia so far, we have analyzed δ²H_n–alkane and δ¹⁸O_ara in topsoils collected along a transect through Mongolia, and we compared these values with the isotopic composition of precipitation (δ²H_p–WM and δ¹⁸O_p–WM, modeled data) and various climate parameters. δ²H_n–alkane and δ¹⁸O_ara are more positive in the arid south-eastern part of our transect, which reflects the fact that also the precipitation is more enriched in ²H and ¹⁸O along this part of the transect. The apparent fractionation ε_app, i.e., the isotopic difference between precipitation and the investigated compounds, shows no strong correlation with climate along the transect (ε_{2H n–C29/p} = −129 ± 14‰, ε_{2H n–C31/p} = −146 ± 14‰, and ε_{18O ara/p} = +41 ± 2‰). Our results suggest that δ²H_n–alkane and δ¹⁸O_ara in topsoils from Mongolia reflect the isotopic composition of precipitation and are not strongly modulated by climate. Correlation with the isotopic composition of precipitation has root-mean-square errors of 13.4‰ for δ²H_n–C29, 12.6 for δ²H_n–C31, and 1.2‰ for δ¹⁸O_ara, so our findings corroborate the great potential of compound-specific δ²H_n–alkane and δ¹⁸O_ara analyzes for paleohydrological research in Mongolia.

叶蜡来源的化合物特有的氢和氧同位素分析 ñ烷烃（δ ² ħ_正构烷烃）和半纤维素衍生阿拉伯糖（δ ¹⁸ Ø _ARA）是paleohydrological重建有价值的，创新的工具。上一页校准研究表明δ ² ^ h_正构烷烃和δ ¹⁸ ö _ARA反映沉淀的同位素组成，但-根据区域-可通过evapotranspirative富集强烈调制。由于没有校准研究半干旱和干旱蒙存在，到目前为止，我们已经分析δ ² ^ h_正构烷烃和δ ¹⁸ ö _ARA在表土沿穿过蒙一个断面采集，我们用沉淀的同位素组合物相比这些值（δ ² ħ_对WM和δ ¹⁸ ö _P-WM，建模的数据）和各种气候参数。δ ² ħ_正构烷烃和δ ¹⁸ Ø _ARA在我们的样带，这反映了一个事实也沉淀在更丰富的干旱东南部更加积极的² H和¹⁸沿断面的这一部O。表观分馏ε_应用程式，即，沉淀和所研究化合物，没有显示很强的相关性之间有恒温在样同位素差异（ε _{2H正C29 / P} = -129±14‰，ε _{2H正C31 / P} = −146±14‰，和_{ε18O ara / p} = +41±2‰）。我们的研究结果表明，δ ² ^ h_正构烷烃和δ ¹⁸ ö _ARA在从蒙表土反映沉淀的同位素组成，并且不强烈气候调制。与沉淀的同位素组成的相关性具有用于δ13​​.4‰根均方误差² ħ_n–C29，12.6δ ² ħ_n–C31和1.2‰，δ ¹⁸ ö _ARA，所以我们的发现证实了化合物的具体的巨大潜力δ ² ħ_正构烷烃和δ ¹⁸ Ø _ARA分析了蒙古paleohydrological研究。