Organic Matter Concentration and Composition in November 2021 and April 2022 from 12 Streams Impacted by the 2020 Holiday Farm Fire (v2)

This dataset represents results from a field study aiming to understand storm induced transport of pyrogenic materials to streams impacted by varying degrees of burn severity. Time series samples were collected at 5 sites within the McKenzie River Watershed (Oregon, USA) whose catchment were each completely engulfed by the 2020 Holiday Farm Fire. An additional 7 sites were sampled once during the storm. The samples were collected during storm events in November 2020, January 2021, November 2021, and April 2022. Samples were characterized for benezenepolycarboxylic acids (BPCA), ultra-high resolution mass spectrometry, dissolved organic carbon and optics (absorbance and fluorescence). Fourier-transform ion cyclotron resonance mass spectrometry (FTICR) and dissolved organic carbon data from the November 2020 (referred to as “EWEB_2020”) sampling can be found in a separate data package (doi: 10.15485/1869708). NOTE: The 2020 samples were run on FTICR-MS in two unique instances. The first run can be found in the previous data package (EWEB_2020). The second run is included in this data package. These samples were run for a second time so that the data were more directly interoperable with the other samples in this data package. We have not done any investigation into the differences/similarities between these datasets and the previously ran/published data in the other data package. This data package was originally published in November 2024. It was updated in April 2025 (v2; new and modified files). See the change history section below for more details. For details on how to navigate data packages generated by this project, see https://data.ess-dive.lbl.gov/portals/PNNLRiverCorridorSFA/About. This dataset contains (1) file-level metadata; (2) data dictionary; (3) data package readme; (4) metadata; (5) methods information; (6) dissolved organic carbon (DOC, measured as non-purgeable organic carbon, NPOC) data; (7) excitation emission matrix (EEM) methods; and (8) a sub-folder with processed EEM data (9) benzene polycarboxylic acid (BPCA) concentration data; (10) Fourier transform ion cyclotron resonance mass spectrometry (FTICR-MS) methods; and (11) folder of high-resolution characterization of organic matter via 12 Tesla FTICR-MS generated through the Environmental Molecular Sciences Laboratory (EMSL; https://www.pnnl.gov/environmental-molecular-sciences-laboratory). The EEMs sub-folder contains two additional folders; the Absorbance and Fluorescence folders which contain the processed EEMs absorbance and fluorescence data respectively. This package contains the following file types: csv, xml, pdf.

本数据集源自一项野外研究成果，旨在探究风暴驱动下燃烧成因物质向受不同火烧烈度影响的溪流的输运过程。
于美国俄勒冈州麦肯齐河流域的5个采样点采集了时序样品，其集水区均完全受2020年假日农场火灾波及。另有7个采样点在风暴期间仅完成单次采样。
样品分别于2020年11月、2021年1月、2021年11月及2022年4月的风暴事件中采集。
对样品开展了苯多羧酸（benzenepolycarboxylic acids, BPCA）、超高分辨率质谱、溶解性有机碳（dissolved organic carbon, DOC）及光学特性（吸光度与荧光特性）的表征分析。
2020年11月采样（标注为"EWEB_2020"）的傅里叶变换离子回旋共振质谱（Fourier-transform ion cyclotron resonance mass spectrometry, FTICR-MS）与溶解性有机碳数据，可在独立数据包（DOI: 10.15485/1869708）中获取。
注意：2020年的样品在FTICR-MS上进行了两次独立测试。首次测试数据见于前述"EWEB_2020"数据包，本次数据包包含第二次测试数据。本次复测旨在让该批次数据与本数据包内其余样品的数据具备更直接的互操作性。我们未对本数据包与前述已发布数据包中数据集的差异或相似性开展任何研究。
本数据包最初于2024年11月发布，2025年4月更新至v2版本（新增并修改了部分文件），详细更新内容请参阅下文的变更历史部分。
如需了解本项目生成数据包的浏览方法，请访问：https://data.ess-dive.lbl.gov/portals/PNNLRiverCorridorSFA/About。
本数据集包含以下内容：(1) 文件级元数据；(2) 数据字典；(3) 数据包自述文档；(4) 元数据；(5) 方法学信息；(6) 溶解性有机碳（DOC，以不可吹扫有机碳non-purgeable organic carbon, NPOC为测定基准）数据；(7) 激发发射矩阵（excitation emission matrix, EEM）方法说明；(8) 存储处理后EEM数据的子文件夹；(9) 苯多羧酸（BPCA）浓度数据；(10) 傅里叶变换离子回旋共振质谱（FTICR-MS）方法说明；(11) 由环境分子科学实验室（Environmental Molecular Sciences Laboratory, EMSL；https://www.pnnl.gov/environmental-molecular-sciences-laboratory）通过12特斯拉FTICR-MS完成的有机质高分辨率表征数据集文件夹。
EEM子文件夹包含两个额外子文件夹：吸光度文件夹与荧光文件夹，分别存储处理后的EEM吸光度数据与荧光数据。
本数据包包含以下文件格式：csv、xml、pdf。