Anion Data for the East River Watershed, Colorado (2014-2023)

The anion data for the East River Watershed, Colorado, consists of fluoride, chloride, sulfate, nitrate, and phosphate concentrations collected at multiple, long-term monitoring sites that include stream, groundwater, and spring sampling locations. These locations represent important and/or unique end-member locations for which solute concentrations can be diagnostic of the connection between terrestrial and aquatic systems. Such locations include drainages underlined 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 solute concentrations 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 the riverine export of multiple anionic species. Such data may be combined with stream gauging stations co-located at each monitoring site to directly quantify the seasonal and annual mass flux of these anionic species out of the watershed. This data package contains (1) a zip file (anion_data_2014-2023.zip) containing a total of 346 files: 345 data files of anion 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 (v5_20240311_flmd.csv) file that lists each file contained in the dataset with associated metadata; and (3) a data dictionary (v5_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 39 locations containing anion data. Update on 2022-06-10: versioned updates to this dataset were made along with these changes: (1) updated anion data for all locations up to 2021-12-31, (2) removal of units from column headers in datafiles, (3) added row underneath headers to contain units of variables, (4) restructure of units to comply with CSV reporting format requirements, and (5) 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 2022-12-20: Updates were made to both the data files and reporting format specific files. Conversion issues affecting ER-PLM locations for anion data was resolved for the data files. Additionally, the flmd and dd files were updated to reflect the updated versions of these files. Available data was added up until 2022-03-14. 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 2023-05-19. 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 2023-09-11. 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阴离子数据集涵盖氟化物、氯化物、硫酸盐、硝酸盐及磷酸盐的浓度数据，采集自多个长期监测点位，涵盖溪流、地下水与泉水采样点。这些点位代表了重要且/或独特的端元点位，其溶质浓度可用于诊断陆地与水生生态系统之间的连通性。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、山杨林或草甸为主导覆盖的区域，以及受历史采矿活动影响且存在天然矿化岩石的流域。
构建多环境下的溶质浓度长期监测序列，是量化气候变化与干旱、森林死亡、野火等突发性气候扰动对多种阴离子物种河流输出通量影响的关键组成部分。此类数据可与各监测点位同步布设的河道测流站结合，直接量化该流域内这些阴离子物种的季节与年度质量通量输出情况。
本数据包包含三部分内容：(1) 压缩包anion_data_2014-2023.zip，总计包含346个文件：其中345个为劳伦斯伯克利国家实验室（Lawrence Berkeley National Laboratory, LBNL）流域功能科学重点区域（Watershed Function Scientific Focus Area, SFA）内各点位的阴离子数据CSV文件，另有1个locations.csv文件，包含各点位的经纬度信息；(2) 文件级元数据文件v5_20240311_flmd.csv，列出数据集内所有文件及其关联元数据；(3) 数据字典文件v5_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、单位与数据类型。
阴离子数据文件中的缺失值以“-9999”或“0.0”标注未检出（N.D.）数据。本数据集总计包含39个点位的阴离子数据。
**2022年6月10日更新**：本数据集进行了版本化更新，变更内容包括：(1) 将所有点位的阴离子数据更新至2021年12月31日；(2) 移除数据文件列标题中的单位标注；(3) 在标题行下方新增一行，用于标注变量单位；(4) 调整单位格式以符合CSV报告规范；(5) 新增文件级元数据（flmd.csv）与数据字典（dd.csv），以适配文件级元数据报告格式。
**2022年9月9日更新**：更新了报告格式相关文件（文件级元数据与数据字典），修正了文件名互换的问题，补充了两类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（v2_20220909_flmd.csv与v2_20220909_dd.csv）。
**2022年12月20日更新**：更新了数据文件与报告格式相关文件。修复了ER-PLM点位阴离子数据的转换错误，将数据更新至2022年3月14日；同步更新flmd与dd文件以反映版本变更。
**2023年8月8日更新**：更新了数据文件与报告格式相关文件，新增截至2023年5月19日的阴离子监测数据，并同步更新文件级元数据与数据字典以匹配新增数据。
**2024年3月11日更新**：更新了数据文件与报告格式相关文件，新增截至2023年9月11日的阴离子监测数据；修正了数据文件中的错误数据点（1970年与2001年的无效数据），并同步更新报告格式文件以反映新增数据。