Coloured Dissolved Organic Matter
Coloured Dissolved Organic Matter (CDOM), or Chromophoric, is a component of dissolved organic matter (DOM) that is measured optically. CDOM fluorometers measure the intensity and wavelength distribution of an emission spectrum after excitation by a particular spectrum of light. These parameters detect the amount of CDOM, because it absorbs short wavelengths ranging from blue to ultraviolet.
CDOM occurs naturally in the ocean by presence of tannins (chemical compounds) released from decaying organic matter (detritus). CDOM is increased by human activities such as logging, agriculture, and effluent discharge. Monitoring CDOM in the ocean is important because it limits photosynthesis and the growth of phytoplankton. Phytoplankton are diverse types of bacteria, protists and single-celled plants that form the base of marine food webs, and are also the primary producers of oxygen in the oceans. As CDOM increases in water, it will appear more green to brown in colour.
Individual instruments of the above category, which are (or have been) connected to our observatories. Click an instrument for detailed information.
Click the instrument categories below for descriptions and lists of instruments belonging to that category.