Swiss data quality: augmenting CAMELS-CH with isotopes, water quality, agricultural and atmospheric chemistry data

Check out the paper here (published at Nature Scientific Data) CAMELS-CH-Chem is an extension of the CAMELS-CH dataset (Catchment Attributes and Meteorology for Large-sample Studies in Switzerland). It adds over 40 aggregated water quality parameters for 115 Swiss catchments from 1981 to 2020. The dataset includes time series data for more than 30 stream water chemistry variables, with hourly and daily measurements of water temperature, dissolved oxygen, pH, and electrical conductivity. It also provides (bi)monthly measurements for parameters like alkalinity (HCO₃), ammonium, calcium, chloride, dissolved and total organic carbon, dissolved reactive phosphorus, total filtered phosphorus, total hardness, total nitrogen, total phosphorus, nitrate, nitrite, potassium, magnesium, sodium, silica, and sulfate. Regarding catchment aggregated data, the dataset includes (bi)monthly stream and rainwater isotope data (deuterium and oxygen-18). Each catchment also has annual land cover data, agricultural information (crop types and livestock density), and atmospheric deposition levels of NO₃, NH₄, NH₃, NO₂, and total inorganic nitrogen. Updates 19 July 2025: version 1.0 General: Version of the official paper release. We updated the units of some variables in the following README files: "/stream_water_chemistry/interval_samples/nawa_fracht/README.pdf" "/stream_water_chemistry/interval_samples/nawa_trend/README.pdf" 20 June 2025: version 0.2 General: Added the folder additional_data_from_studies, which contains a non-exhaustive overview of previous studies conducted in Switzerland with published water quality datasets covering nested catchments within the 115 CAMELS-CH-Chem dataset. Added a "readme.pdf" file to each subfolder, providing detailed information about the variables contained in each file.可查阅本数据集相关论文（发表于《Nature Scientific Data》）。 CAMELS-CH-Chem 是 CAMELS-CH 数据集（瑞士大样本集水区属性与气象学研究数据集，Catchment Attributes and Meteorology for Large-sample Studies in Switzerland）的扩展版本，其为1981年至2020年间的115个瑞士集水区新增了超40项聚合水质参数。该数据集包含30余种河流水化学变量的时序数据，涵盖水温、溶解氧、pH值与电导率的逐小时及逐日观测值；同时提供碱度（HCO₃⁻）、铵态氮、钙、氯化物、溶解态与总有机碳、活性溶解态磷、总过滤态磷、总硬度、总氮、总磷、硝酸盐、亚硝酸盐、钾、镁、钠、二氧化硅及硫酸盐等参数的双月/月均观测数据。 在集水区聚合数据层面，数据集包含河流水与雨水的同位素（氘与氧-18）双月/月均观测数据；每个集水区还附带年度土地覆被数据、农业信息（作物类型与牲畜密度）以及NO₃、NH₄、NH₃、NO₂与总无机氮的大气沉降水平数据。 更新记录 2025年7月19日：版本1.0 本版本为正式论文发布版。 我们对以下README文件中的部分变量单位进行了更新： "/stream_water_chemistry/interval_samples/nawa_fracht/README.pdf" "/stream_water_chemistry/interval_samples/nawa_trend/README.pdf" 2025年6月20日：版本0.2 新增`additional_data_from_studies`文件夹，其中收录了瑞士境内已发表的、覆盖CAMELS-CH-Chem数据集115个嵌套集水区的水质相关既往研究的非详尽概览。 为每个子文件夹新增`readme.pdf`文件，详细说明各文件包含的变量信息。