Stable oxygen and hydrogen isotope composition of precipitation, river water and lake water in the Five Lakes of Mikata catchment, 2011-2012 and 2020-2022

This dataset contains information about the stable oxygen and hydrogen isotope composition (δ18O, δ2H and d-excess) of waters within the Five Lakes of Mikata catchment. Datapoints span March 2011 – January 2012 and July 2020 – July 2022. Samples include precipitation on an event-basis, weekly river water and weekly lake water. To accompany the precipitation isotope composition data, total precipitation and average temperature during each subsampling period is provided. Water temperature and salinity variations with depth within Lake Suigetsu on six dates across the 2020 – 2022 sampling interval are also given. This data was collected to determine if catchment water composition reflects East Asian Monsoon variability.

This work was supported by an Australian Research Council Discovery Project (DP200101768), a JSPS KAKENHI Grant (19K20442) and the NERC IAPETUS2 Doctoral Training Partnership.

本数据集涵盖了三方五湖（Five Lakes of Mikata）流域内水体的稳定氧、氢同位素组成（δ18O、δ2H与氘盈余（d-excess））数据。数据采集时段涵盖2011年3月至2012年1月，以及2020年7月至2022年7月。采样样本包括逐次降水事件样本、周际河水样本与周际湖水样本。为配套降水同位素组成数据，本数据集还提供了各次采样时段内的总降水量与平均气温。此外，本数据集还包含2020-2022采样周期内6个采样日期的水月湖（Lake Suigetsu）水温与盐度随深度的变化特征。本数据集的采集目的为探究流域水体同位素组成是否能够反映东亚季风（East Asian Monsoon）的变异性。

本研究得到澳大利亚研究理事会发现项目（Australian Research Council Discovery Project，DP200101768）、日本学术振兴会KAKENHI资助项目（JSPS KAKENHI，19K20442）以及英国自然环境研究委员会IAPETUS2博士生培训合作项目（NERC IAPETUS2 Doctoral Training Partnership）的资助。