Naden - Sulfur May 2026

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: Reductions in sulfate deposition have been linked to shifts in the nature of Natural Organic Matter (NOM) , making it more hydrophobic and colored in certain "brown water" environments.

While the model primarily targets carbon, sulfur plays a critical role in these same environmental systems:

: Sulfur is essential in the biosynthesis of metabolic cofactors like NAD+ . For example, Quinolinate synthetase (NadA) is an iron–sulfur enzyme critical to these biological pathways.

The model described by Naden et al. follows a two-phase process for simulating DOC concentrations at a catchment outlet: