👉 Occurrence fluid, also known as dissolved organic carbon (DOC) or dissolved organic matter (DOM), refers to the organic compounds that are dissolved in water. These compounds originate from various sources, including the decomposition of plant and animal material, microbial activity, and human activities like agriculture and urban runoff. Occurrence fluid plays a crucial role in aquatic ecosystems by influencing water chemistry, nutrient cycling, and the overall health of aquatic life. It can affect light penetration, which impacts photosynthesis in aquatic plants, and it serves as a food source for microorganisms. The composition of occurrence fluid varies widely depending on the source and environmental conditions, making it a key indicator of ecosystem health and a focus in studies related to climate change and water quality.
