ODM2 Variable Name Controlled Vocabulary ODM2 Working Group A vocabulary for describing the name of Variables. Fluorescence, dissolved organic carbon (DOC) Fluorescence of dissolved organic carbon (DOC). DOC is an element specific fraction of dissolved organic matter (DOM). https://aslopubs.onlinelibrary.wiley.com/doi/abs/10.4319/lo.2001.46.1.0038 Added to support Critical Zone Observatory (CZO) data use cases.