Data for Roebuck et al. (2025), "Differences in dissolved organic matter composition between rivers and estuaries is conserved across freshwater and saltwater coastal regions"

Dissolved organic matter (DOM) in coastal surface waters influences local water quality and is an important component of biogeochemical cycling in coastal systems, but the processes that alter DOM composition along lower reaches of rivers and estuarine waters are poorly understood. Roebuck et al. (2025) leveraged a spatially distributed community sampling effort in coastal ecosystems across two regions to identify broad spatial drivers of surface water DOM composition and identify transferable trends between saltwater and freshwater coastal systems. Samples were collected by community members from 47 locations within the mid-Atlantic and Great Lakes coastal regions.This dataset includes:* A selection of commonly reported absorbance and fluorescence peaks normalized to dissolved organic carbon concentrations* Parallel factor output from the EC1 fluorescence datasets* A selection of commonly reported absorbance and fluorescence peaks * Spectral indices output from matlab script for absorbance and fluorescence datasets* CO2sys calculations of pH changes under varying temperatures and a constant salinity, DIC, and alkalinity concentrationAll data files are plain-text CSV (comma separated value) and no special software is required to read them.. Authors: Roebuck, J. Alan [Pacific Northwest National Laboratory (PNNL)] (ORCID:0000000285752572); Myers-Pigg, Allison [Pacific Northwest National Laboratory (PNNL)] (ORCID:0000000269056841); Regier, Peter [Pacific Northwest National Laboratory (PNNL)] (ORCID:0000000283751314); Ward, Nicholas D. [Pacific Northwest National Laboratory (PNNL)] (ORCID:0000000161745581); Cooper, Matthew J. [Grand Valley State University] (ORCID:0000000151708728). DOE Contract: AC02-05CH11231. Subjects: 54 ENVIRONMENTAL SCIENCES; EARTH SCIENCE > OCEANS > COASTAL PROCESSES; EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > GROUND WATER; EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY; EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > SOLIDS > TOTAL DISSOLVED SOLIDS; ESS-DIVE CSV File Formatting Guidelines Reporting Format; ESS-DIVE File Level Metadata Reporting Format; EXCHANGE Campaign 1