Stable isotope data of water, ice and snow samples obtained in 2018 and 2020 at Lake Khamra, SW Yakutia, Siberia, Russia

The dataset contains stable isotope data (δ18O and δD) from water, ice and snow samples of Lake Khamra received during two field campaigns in August 2018 and March 2020. Oxygen and hydrogen isotope analyses were carried out at the ISOLAB Facility at Alfred Wegener Institute in Potsdam (hdl:10013/sensor.ddc92f54-4c63-492d-81c7-696260694001) with mass spectrometers (DELTA-S Finnigan MAT, USA): hdl:10013/sensor.af148dea-fe65-4c87-9744-50dc4c81f7c9 and hdl:10013/sensor.62e86761-9fae-4f12-9c10-9b245028ea4c employing the equilibration method (details in Meyer et al., 2000). δ18O and δD values are given in per mill (‰) vs. Vienna Standard Mean Ocean Water (VSMOW). N indicates the number of measurements per sample. If N > 1, the mean isotope value of the sample was calculated from the individual measurement results. The standard deviation includes all measurements of the individual sample, which is generally better than the external (or machine) error. The external errors of long-term standard measurements for hydrogen and oxygen are better than 0.8‰ and 0.10‰, respectively (Meyer et al., 2000). The second order parameter d excess was computed according to: d excess = δD – 8 * δ18O (Dansgaard, 1964). For the calculation of d excess, the respective mean values were used.

本数据集涵盖2018年8月与2020年3月两次野外考察活动期间采集的哈姆拉湖（Lake Khamra）水体、冰体与雪样的稳定同位素数据（δ¹⁸O与δD）。氧与氢同位素分析工作于波茨坦阿尔弗雷德·魏格纳研究所的ISOLAB实验设施（存档编号：hdl:10013/sensor.ddc92f54-4c63-492d-81c7-696260694001）完成，所用质谱仪为美国产DELTA-S Finnigan MAT质谱仪，对应存档编号分别为hdl:10013/sensor.af148dea-fe65-4c87-9744-50dc4c81f7c9与hdl:10013/sensor.62e86761-9fae-4f12-9c10-9b245028ea4c，分析采用平衡法（详细方法参见Meyer等，2000）。δ¹⁸O与δD值以相对于维也纳标准平均海洋水（Vienna Standard Mean Ocean Water, VSMOW）的千分比（‰）表示。N代表单个样本的测量次数。当N>1时，样本的同位素平均值由单次测量结果计算得到。样本的标准差涵盖该样本的全部测量值，通常优于外部误差（或仪器误差）。长期标准样品的氢、氧同位素外部误差分别优于0.8‰与0.10‰（Meyer等，2000）。二阶参数氘盈余（d excess）按照以下公式计算：d excess = δD – 8 × δ¹⁸O（Dansgaard, 1964）。计算氘盈余时采用对应样本的同位素平均值。