Stable Water Isotope Data for the East River Watershed, Colorado (2014-2024)

The stable water isotope data for the East River Watershed, Colorado, consists of delta2H (hydrogen) and delta18O (oxygen) values from samples collected at multiple, long-term monitoring sites including streams, groundwater wells, springs, and a precipitation collector used to establish a local meteoric water line (LMWL) for the watershed. These locations represent important and/or unique end-member locations for which stable isotope values can be diagnostic of the connection between precipitation inputs as snow and rain and riverine export. Such locations include drainages underline entirely or largely by shale bedrock, land covered dominated by conifers, aspens, or meadows, and drainages impacted by historic mining activity and the presence of naturally mineralized rock. Developing a long-term record of water isotope values from a diversity of environments is a critical component of quantifying the impacts of both climate change and discrete climate perturbations, such as drought, forest mortality, and wildfire, on water export. Such data may be combined with stream gaging stations co-located at each surface water monitoring site to relate seasonal variations in water export to their stable isotopic signature. Data for liquid water delta2H and delta18O values are reported in units of parts per thousand (per-mil; ‰). This data package contains (1) a zip file (isotope_data_2014-2024.zip) containing a total of 69 files: 68 data files of isotope data from across the Lawrence Berkeley National Laboratory (LBNL) Watershed Function Scientific Focus Area (SFA) which is reported in .csv files per location and a locations.csv (1 file) with latitude and longitude for each location; (2) a file-level metadata (v4_20240311_flmd.csv) file that lists each file contained in the dataset with associated metadata; and (3) a data dictionary (v4_20240311_dd.csv) file that contains terms/column_headers used throughout the files along with a definition, units, and data type. Missing values within the anion data files are noted as either "-9999" or "0.0" for not detectable (N.D.) data. There are a total of 34 locations containing isotope data.Update on 2022-06-10: versioned updates to this dataset were made along with these changes: (1) updated isotope data for all locations up to 2021-12-31 and (2) the addition of the file-level metadata (flmd.csv) and data dictionary (dd.csv) were added to comply with the File-Level Metadata Reporting Format.Update on 2022-09-09: Updates were made to reporting format specific files (file-level metadata and data dictionary) to correct swapped file names, add additional details on metadata descriptions on both files, add a header_row column to enable parsing, and add version number and date to file names (v2_20220909_flmd.csv and v2_20220909_dd.csv).Update on 2023-08-08: Updates were made to both the data files and reporting format specific files. New available anion data was added, up until 2023-03-13. The file level metadata and data dictionary files were updated to reflect the additional data added.Update on 2024-03-11: Updates were made to both the data files and reporting format specific files. New available anion data was added, up until 2024-02-19. Further, revisions to the data files were made to remove incorrect data points (from 1970 and 2001). The reporting format specific files were updated to reflect the additional data added.

科罗拉多州东河流域稳定水同位素数据集，包含从多个长期监测站点采集的δ²H（氢）和δ¹⁸O（氧）值，监测站点涵盖溪流、地下水井、泉点以及用于建立流域本地大气降水线（local meteoric water line, LMWL）的降水收集装置。这些点位代表重要且/或独特的端元站点，其稳定同位素值可用于示踪降雪、降雨等降水输入与河流径流之间的联系。此类点位包括完全或主要以页岩基岩为基底的流域、以针叶林、美洲山杨或草甸为主的覆盖区域，以及受历史采矿活动影响且存在天然矿化岩石的流域。构建来自多样环境的长期水同位素记录，是量化气候变化与离散气候扰动（如干旱、森林死亡事件与野火）对径流影响的关键环节。此类数据可与每个地表水监测站点配套的水文测站相结合，将径流的季节变化与其稳定同位素特征关联起来。液态水的δ²H和δ¹⁸O值以千分比（per-mil；‰）为单位报告。本数据包包含三部分内容：(1) 压缩包`isotope_data_2014-2024.zip`，内含总计69个文件：68个按点位分类的.csv格式同位素数据文件，覆盖劳伦斯伯克利国家实验室（Lawrence Berkeley National Laboratory, LBNL）流域功能科学聚焦区（Watershed Function Scientific Focus Area, SFA），以及1个包含各点位经纬度信息的`locations.csv`文件；(2) 1个文件级元数据文件`v4_20240311_flmd.csv`，列出数据集中所有文件及其关联元数据；(3) 1个数据字典文件`v4_20240311_dd.csv`，包含所有文件中使用的术语/列标题，以及对应的定义、单位和数据类型。阴离子数据文件中的缺失值以"-9999"或"0.0"表示未检出（not detectable, N.D.）数据。本数据集共包含34个带有同位素数据的点位。2022年6月10日更新：对本数据集进行了版本化更新，具体变更包括：(1) 更新所有点位的同位素数据至2021年12月31日；(2) 新增文件级元数据（flmd.csv）与数据字典（dd.csv），以符合文件级元数据报告格式要求。2022年9月9日更新：对报告格式相关文件（文件级元数据与数据字典）进行更新，修正了文件名颠倒的问题，补充了两个文件的元数据描述细节，新增`header_row`列以支持数据解析，并在文件名中添加版本号与日期（即`v2_20220909_flmd.csv`与`v2_20220909_dd.csv`）。2023年8月8日更新：对数据文件与报告格式相关文件均进行了更新，新增截至2023年3月13日的最新阴离子数据，并更新了文件级元数据与数据字典以反映新增数据内容。2024年3月11日更新：对数据文件与报告格式相关文件均进行了更新，新增截至2024年2月19日的最新阴离子数据；同时修订了数据文件，移除了1970年与2001年的错误数据点，并更新了报告格式相关文件以反映新增数据内容。