n-alkane carbon and hydrogen stable isotope data from sediment core M125-95-3

In order to assess the response of vegetation from eastern tropical South America to hydroclimate changes during the last ca. 45 kyr, we analyzed marine sediment core M125-95-3 that archived sediments from the São Francisco River drainage basin. We used the stable carbon (δ13C) and hydrogen (δD) isotopes of long-chain n-alkanes (i.e., C29-C31) to reconstruct regional vegetation composition and precipitation dynamics, respectively. The data set contains marine sedimentary records of long-chain n-alkane δ13C and δD, as well as the isotopic difference between homologues (Δδ13C31-29), and locally estimated scatterplot smoothing (LOESS) of indicated data. The δ13Cwax refers to the weighted averages of δ13C29 and δ13C31 values. The δDwax refers to the weighted averages of δD29 and δD31 values.

为评估南美东部热带区域植被对过去约4.5万年水文气候变化的响应，我们分析了海洋沉积岩芯M125-95-3，该岩芯保存了来自圣弗朗西斯科河流域的沉积物。我们分别采用长链正构烷烃（long-chain n-alkanes，即C29~C31）的稳定碳同位素（δ¹³C）与氢同位素（δD），重建区域植被组成与降水动态。本数据集包含长链正构烷烃的δ¹³C与δD海洋沉积记录，以及同系物间的同位素差值（Δδ¹³C31-29），同时包含目标数据的局部加权回归散点平滑法（LOESS）拟合结果。其中δ¹³Cwax指δ¹³C29与δ¹³C31的加权平均值，δDwax指δD29与δD31的加权平均值。