Dissolved organic matter characterization for seasonal synoptic sampling of 100 urban streams in Boston, Massachusetts (USA) from 2021-2022

This dataset contains dissolved organic matter (DOM) characteristics from surface water samples collected at 100 urban stream locations in the greater Boston, Massachusetts metropolitan area. Samples were collected four times (September 2021, November 2021, April 2022, and July 2022) to capture spatial and seasonal variation in DOM characteristics. Fluorescent optical properties were measured on filtered water samples to understand the chemical composition of DOM. Excitation-Emission Matrices (EEMs) were measured using a Horiba Aqualog spectrometer. DOM characteristics were quantified using both standard fluorescence and absorbance metrics as well as through parallel factor (PARAFAC) analysis. These data were collected as part of the Carbon in Urban Rivers Biogeochemistry (CURB) Project. Detailed field data and site data are published separately and can be linked using the “curbid” and “synoptic_event” columns in each dataset.本数据集涵盖美国马萨诸塞州大波士顿都会区100处城市溪流点位采集的地表水样品的溶解性有机质（dissolved organic matter, DOM）特征。研究团队于2021年9月、2021年11月、2022年4月及2022年7月共开展四次采样，以捕捉DOM特征的空间分布与季节变异规律。针对过滤后的水样测定其荧光光学特性，以解析DOM的化学组成；采用Horiba Aqualog光谱仪采集激发发射矩阵（Excitation-Emission Matrices, EEMs）数据。DOM特征通过标准荧光与吸光度指标，以及平行因子（parallel factor, PARAFAC）分析两种方法进行定量表征。本数据集系城市河流碳生物地球化学（Carbon in Urban Rivers Biogeochemistry, CURB）项目的研究产出。详细的野外采集数据与点位基础数据已单独发表，可通过各数据集内的"curbid"与"synoptic_event"字段实现关联匹配。