IHSS&IWA26 / BRNO / CZECHIA / 23–28 August 2026 BOOK OF ABSTRACTS 82 Environment, Agriculture, and Forestry Tuesday, 25 August 2026 / Hall B+C SL35 The Unique Chemodiversity of Geothermal Dissolved Organic Matter in Yellowstone Hot Springs, Wyoming, USA Michael Gonsior1, Philippe Schmitt-Kopplin2,3, Nancy Hinman4, Norbert Hertkorn5, William J. Cooper6, Shannon Leigh McCallister7 1 Catalan Institute for Water Research (ICRA), 17003 Girona, Spain. 2 Research Unit Analytical Biogeochemistry (BGC), Helmholtz Zentrum Muenchen; 85764 Neuherberg, Germany. 3 Analytical Food Chemistry, Technische Universitä t Mü nchen; 85354, FreisingWeihenstephan, Germany. 4 Montana University, Missoula, USA. 5 Linköping University, Sweden. 6 University of California, Irvine, USA. 7 Biology Department, Virginia Commonwealth University, Richmond, USA. Yellowstone National Park hydrothermal springs were investigated according to their organic geochemistry and their dissolved organic matter (YDOM). This YDOM showed a unique and sulfur-rich organic chemodiversity that demonstrated that Yellowstone hot springs are DOM chemodiversity hot spots. Different geothermal sources of DOM were interrogated to be indicative for a geothermal signature and to be distinctly different from organic matter originating from extremophiles and chemically altered modern terrigenous DOM. Dramatic changes that occurred in the hot spring Cinder Pool between 2017 and 2021, were particularly valuable in relating organic matter changes to changes in spring morphology. Isolated geochemical YDOM signatures reflect the extreme physico-chemical processes present in these hydrothermal features and may assist in better constraining the chemodiversity of DOM arising from inorganic hydrothermal processes.
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