Fourier Transform-Ion Cyclotron Resonance Mass spectrometry (FT-ICR MS) peaks lists from the Tapajós River, Brazil from 2016-2023

This dataset includes assigned mass spectral peak lists from river water sampled near-monthly from the Tapajós River, Brazil between 2016-2023. Data were collected on a 21 T Fourier Transform-Ion Cyclotron Mass Spectrometer in electrospray negative ionization from solid phase DOM extracts. Trends in peak presence/absence and relative abundance reveal changes to DOM sourcing based on hydroclimate and multiyear climate anomalies.