Dissolved organic matter characterization for seasonal synoptic sampling of 93 urban streams in Atlanta, Georgia (USA) from 2021-2022

This dataset contains dissolved organic matter (DOM) characteristics from surface water samples collected at 93 first- to fifth-order streams in the Altamaha, Chattahoochee, and Flint Watersheds draining a gradient of urban land use in the greater Atlanta, Georgia metropolitan area. Samples were collected four times (September 2021, December 2021, March 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.

本数据集涵盖佐治亚州亚特兰大都会区范围内，阿尔塔马哈（Altamaha）、查特胡奇（Chattahoochee）与弗林特（Flint）流域内93条1至5级溪流的地表水样品的溶解有机质（dissolved organic matter, DOM）特征，上述流域的汇水区域覆盖了梯度各异的城市土地利用类型。研究团队于2021年9月、2021年12月、2022年3月及2022年7月共开展4次采样，以捕捉溶解有机质特征的空间与季节变异规律。对过滤后的水样测定其荧光光学特性，以解析溶解有机质的化学组成；采用Horiba Aqualog光谱仪采集激发发射矩阵（Excitation-Emission Matrices, EEMs）数据。溶解有机质特征通过标准荧光与吸光度指标，以及平行因子（parallel factor, PARAFAC）分析两种方式完成量化。本数据集为城市河流生物地球化学碳循环（Carbon in Urban Rivers Biogeochemistry, CURB）项目的采集成果之一。详细的野外数据与点位数据已单独发表，可通过各数据集中的"curbid"与"synoptic_event"字段进行关联匹配。