Data of leaf wax hydrogen isotope ratios and climatic variables along an aridity gradient in Chile and globally

This data publication is supplementary to a study on the climatic controls on leaf wax hydrogen isotopes, by Gaviria-Lugo et al. (2023). The dataset contains hydrogen isotope ratios from leaf wax n-alkanes (δ2Hwax) taken from soils, river sediments and marine surface sediments along a climatic gradient from hyperarid to humid in Chile. In addition, for each sampling site the hydrogen isotope ratios from precipitation (δ2Hpre) from the grids produced by the Online Isotopes in Precipitation Calculator (OIPC) (Bowen and Revenaugh, 2003). Furthermore, for each sampling site we report mean annual data of precipitation, actual evapotranspiration, relative humidity, and soil moisture, all derived from TerraClimate (Abatzoglou et al., 2018). Also provide data of mean annual temperature and the annual average of maximum daily temperature derived from WorldClim (Fick and Hijmans, 2017). As a final climatic parameter, we also derived data of aridity index from the Consultative Group of the International Agricultural Research Consortium for Spatial Information (CGIARCSI) (Trabucco and Zomer, 2022). In addition to climatic variables, for each site we include land cover fractions of trees, shrubs, grasses, crops, and barren land. These land cover fractions were obtained from Collection 2 of the Copernicus Global Land Cover layers (Buchhorn et al., 2020) via Google Earth Engine. For further comparison here we provide δ2Hwax compiled from 26 publications (see references) that reported both the n-C29 and n-C31 n-alkanes homologues from soils and lake sediments. For each sampling site of the global compilation, we provide δ2Hpre and the same climatic and land cover parameters as for the Chilean data (i.e., precipitation, actual evapotranspiration, relative humidity, soil moisture, aridity index, temperature, fraction of trees, fraction of grasses, etc.), using the same sources. The data is provided here as one single .xlsx file containing 9 data sheets, but also as 9 individual .csv files, to be accessed using the file format of preference. Additionally, 5 supplementary figures that accompany the publication Gaviria-Lugo et al. (2023) are provided in one single .pdf file. The samples taken for this study were assigned International Geo Sample Numbers (IGSNs), which are included in the provided tables S4, S5 and S6.

本数据发布是Gaviria-Lugo等人（2023）关于叶蜡氢同位素气候控制研究的补充资料。该数据集包含智利境内从极端干旱到湿润气候梯度上，土壤、河流沉积物及海洋表层沉积物中叶蜡正构烷烃的氢同位素比值（δ2Hwax）。此外，每个采样点的降水氢同位素比值（δ2Hpre）来自在线降水同位素计算器（OIPC）生成的网格数据（Bowen与Revenaugh，2003）。同时，每个采样点的年平均降水量、实际蒸散量、相对湿度及土壤湿度数据均来自TerraClimate数据集（Abatzoglou等人，2018）；年均温及日最高温年平均值数据来自WorldClim数据集（Fick与Hijmans，2017）；干旱指数数据源自国际农业研究磋商组织空间信息联盟（CGIARCSI）（Trabucco与Zomer，2022）。除气候变量外，每个采样点还包含树木、灌木、草本、作物及裸地的土地覆盖比例，这些数据来自哥白尼全球土地覆盖图层第二版（Buchhorn等人，2020），通过Google Earth Engine获取。为便于进一步比较，本数据集还包含来自26篇文献（详见参考文献）的δ2Hwax数据，这些文献报道了土壤与湖泊沉积物中n-C29和n-C31正构烷烃同系物的相关数据。对于全球汇编的每个采样点，我们采用相同数据源提供δ2Hpre及与智利数据一致的气候和土地覆盖参数（如降水量、实际蒸散量、相对湿度、土壤湿度、干旱指数、温度、树木比例、草本比例等）。本数据以单个包含9个数据表的.xlsx文件及9个独立.csv文件形式提供，用户可根据偏好选择格式访问。此外，随Gaviria-Lugo等人（2023）研究发表的5幅补充图以单个.pdf文件形式提供。本研究采集的样本均已分配国际地质样本编号（IGSNs），相关编号包含在提供的S4、S5及S6表中。