>32 μm% (GS32) dataset of Holocene and modern surface sediments in Lake Ximenglongtan, southwestern China.

This dataset includes >32 μm% (GS32) data of Holocene and modern surface sediments in Lake Ximenglongtan, southwestern China. The grain size of sediments was measured by the Malvern Mastersizer 3000 laser particle sizer. Before measurement, the organic matter and carbonates in samples are removed using H2O2 and HCl, respectively. All the samples were dispersed in an ultrasonic bath for 15 min after the addition of (NaPO3)6. Each sample was measured three times and the three results needed to be highly similar to be considered qualified. A final average value of three times was obtained to reduce the measurement errors. The GS32 in the lake center area is a sensitive proxy of low lake-level change and is also used to reconstruct the lake-level change across the Holocene in Lake Ximenglongtan, northeastern South Asian monsoon region.

本数据集涵盖中国西南西孟龙潭湖全新世与现代表层沉积物中粒径大于32微米的颗粒百分含量（GS32）数据。沉积物粒度测试采用马尔文Mastersizer 3000激光粒度分析仪完成。测试前，先分别使用过氧化氢（H₂O₂）与盐酸（HCl）去除样品中的有机质与碳酸盐；加入六偏磷酸钠（(NaPO₃)₆）后，将全部样品置于超声浴中分散15分钟。每个样品需重复测定三次，仅当三次结果高度一致时方可判定为有效；最终取三次测定结果的平均值以降低测量误差。湖中心区域的GS32是湖水位下降变化的敏感代用指标，可用于重建南亚季风东北缘西孟龙潭湖全新世以来的湖水位演变历史。