ODM2 Variable Name Controlled Vocabulary ODM2 Working Group A vocabulary for describing the name of Variables. Carbon, organic extractable Mass of carbon extractable by water from soil or forest floor samples, also known as water-extractable organic carbon (WEOC) http://solvita.com/wp-content/uploads/2012/12/Soil_Organic_CN_ojss_2012.pdf Added to support Critical Zone Observatory (CZO) data use cases.