Researchers at Florida State University reviewed how ultrahigh-resolution mass spectrometry can detect molecular fingerprints of human activity in water systems. The technique reads dissolved organic matter at a level of detail that reveals traces of agriculture, urbanization, fires, and permafrost thaw in rivers and lakes worldwide. Similar markers appeared in the Amazon and Mississippi basins, both tied to land conversion. The review also highlights Arctic permafrost risk, since thawed soil carbon can enter the modern carbon cycle and either stay stored or become CO2. The authors push for open data so these markers can be compared across regions. Published in Nature Water, the review combines aquatic biogeochemistry with high-field mass spectrometry at the National MagLab. It is a practical tool for tracking how land use and climate change alter water quality and carbon flows.
