Data for Kim et al., "Variations in the optical and molecular composition of dissolved organic matter exported from coastal wetlands"

Knowledge about sources and composition of marsh-derived dissolved organic matter (DOM) is critical for understanding the role of marshes in coastal biogeochemical cycling and the fate of marsh-derived DOM in the ocean. To investigate tidal variability in composition of marsh-derived DOM, Kim et al. examined the optical and molecular characteristics of hourly surface water samples at three tidal creeks in the Chesapeake Bay. Groundwater samples along the terrestrial landscape gradient as well as estuarine water from the adjacent estuary at each site were also collected to help resolve sources of surface water DOM. Samples were collected in summer 2024 at three sites – SWH: Sweet Hall Marsh, GCW: Kirkpatrick Marsh, and GWI: Goodwin Islands – which are part of synoptic sites in the Chesapeake Bay region of the COMPASS-FME (Coastal Observations, Mechanisms, and Predictions Across Systems and Scales - Field, Measurements, and Experiments) project. Surface water samples were collected hourly over a 48-hour period at each site. Groundwater and estuarine water samples were collected once. This dataset includes - Surface water depth and salinity - Dissolved organic carbon (DOC) and total dissolved nitrogen (TDN) concentrations - Optical indices and relative composition of parallel factor analysis (PARAFAC) components - High resolution mass spectrometry data.

厘清湿地来源溶解性有机质（dissolved organic matter, DOM）的来源与组成，对于明确湿地在海岸生物地球化学循环中的作用，以及湿地来源DOM在海洋中的归趋至关重要。为探究湿地来源DOM组成的潮汐变化特征，Kim等人对切萨皮克湾3条潮汐溪的每小时地表水样品的光学与分子特征进行了分析。同时还采集了沿陆地景观梯度分布的地下水样品，以及各站点邻近河口的河口水样，以辅助明确地表水DOM的来源。
样品于2024年夏季在3个站点采集，分别为SWH：斯威特霍尔湿地（Sweet Hall Marsh）、GCW：柯克帕特里克湿地（Kirkpatrick Marsh）以及GWI：古德温群岛（Goodwin Islands）；上述3个站点均为COMPASS-FME（跨系统与尺度海岸观测、机制解析与预测——野外测量与实验）项目切萨皮克湾区域综合观测站点的组成部分。各站点均在48小时内每小时采集一次地表水样品，地下水与河口水样仅采集一次。
本数据集包含以下内容：——地表水水深与盐度——溶解性有机碳（dissolved organic carbon, DOC）与总溶解性氮（total dissolved nitrogen, TDN）浓度——光学指数及平行因子分析（parallel factor analysis, PARAFAC）组分的相对组成——高分辨率质谱数据。