Molecular evidence for abiotic sulfurization of dissolved organic matter in marine shallow hydrothermal systems ...

• Main Authors: Gómez-Sáez, Gonzalo Vicente, Niggemann, Jutta, Dittmar, Thorsten, Pohlabeln, Anika M., Lang, Susan Q., Noowong, Ann, Pichler, Thomas, Wörmer, Lars, Bühring, Solveig I.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Elsevier Science 2016
• Subjects: Marine shallow hydrothermal systems; dissolved organic matter DOM; dissolved organic sulfur DOS; FT-ICR-MS; Milos Eastern Mediterranean; Dominica Caribbean Sea; Iceland North Atlantic; 550; Iceland; North Atlantic
• Online Access: https://dx.doi.org/10.26092/elib/3213; https://media.suub.uni-bremen.de/handle/elib/8179

Shallow submarine hydrothermal systems are extreme environments with strong redox gradients at the interface of hot, reduced fluids and cold, oxygenated seawater. Hydrothermal fluids are often depleted in sulfate when compared to surrounding seawater and can contain high concentrations of hydrogen sulfide (H2S). It is well known that sulfur in its various oxidation states plays an important role in processing and transformation of organic matter. However, the formation and the reactivity of dissolved organic sulfur (DOS) in the water column at hydrothermal systems are so far not well understood. We investigated DOS dynamics and its relation to the physicochemical environment by studying the molecular composition of dissolved organic matter (DOM) in three contrasting shallow hydrothermal systems off Milos (Eastern Mediterranean), Dominica (Caribbean Sea) and Iceland (North Atlantic). We used ultra-high resolution Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) to characterize the DOM ...