>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地区西孟龙潭湖全新世与现代表层沉积物的粒径大于32μm的颗粒百分含量（GS32）数据。沉积物粒度采用马尔文Mastersizer 3000激光粒度分析仪测定：测试前，分别以过氧化氢（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，将所有样品置于超声波水浴中分散15分钟。每个样品需重复测定三次，且三次测量结果需高度相似方可判定为合格数据，最终取三次测量的平均值以降低测试误差。湖心区域的GS32是湖泊水位变化的敏感代用指标，可用于重建南亚季风区东北部西孟龙潭湖全新世以来的湖泊水位演化历史。