湖泊细菌四醚膜脂化合物分布数据集（近现代）

本研究系统分析了亚洲中纬度地区现代湖泊brGDGTs分布的影响因素。结合全球已发表的其它湖泊数据揭示：1. brGDGTs的异构体化（IR6+7ME指标）受盐度控制，可作为新的盐度指标。2. 盐度引起的异构体化会使MBT′ 5ME古温度指标偏高，导致对过去温度的过高估计。因此，研究者们利用brGDGTs异构体化对MBT′ 5ME与湖水温度的关系进行了进一步校正，以扣除盐度的效应，建立了适用于湖泊温度定量重建的新方法。数据集收集了全球表层湖泊沉积物样品的17种细菌四醚膜脂化合物相对含量，以及由此计算的指标值。共195个点数据。

This study systematically investigated the controlling factors of brGDGTs distribution in modern lakes across the mid-latitudes of Asia. By integrating with other globally published lake datasets, this study uncovered two key findings: 1. The isomerization of brGDGTs (represented by the IR6+7ME index) is governed by salinity, and can function as a novel salinity proxy. 2. Salinity-induced brGDGT isomerization will elevate the values of the MBT' 5ME paleotemperature proxy, thereby leading to overestimation of past temperatures. Accordingly, researchers further calibrated the relationship between MBT' 5ME and lake water temperature using brGDGT isomerization to remove the confounding effect of salinity, and developed a new method applicable to quantitative reconstruction of lake temperatures. This dataset compiles the relative abundances of 17 bacterial tetraether membrane lipid compounds from surface lake sediment samples across the globe, along with the proxy values derived from these measurements. A total of 195 sampling sites/data points are included in this dataset.