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Also known as chromophoric dissolved organic matter, [1] yellow substance, and gelbstoff, CDOM occurs naturally in aquatic environments and is a complex mixture of many hundreds to thousands of individual, unique organic matter molecules, which are primarily leached from decaying detritus and organic matter. [2]
The rivers carry high coloured dissolved organic matter (CDOM) concentrations, shown here interfacing with ocean shelf water. [83] Marine sediments represent the main sites of OM degradation and burial in the ocean, hosting microbes in densities up to 1000 times higher than found in the water column. [84]
The rivers carry high coloured dissolved organic matter (CDOM) concentrations, shown here interfacing with ocean shelf water. [ 1 ] Tropical peat is a type of histosol that is found in tropical latitudes, including South East Asia, Africa, and Central and South America. [ 2 ]
Aquatic organic matter can be further divided into two components: (1) dissolved organic matter (DOM), measured as colored dissolved organic matter (CDOM) or dissolved organic carbon (DOC), and (2) particulate organic matter (POM). They are typically differentiated by that which can pass through a 0.45 micrometre filter (DOM), and that which ...
The resulting mixture can increase the content of dissolved organic matter (DOM) and total organic carbon (TOC) in soil. [35] Lignite (brown coal) may also be oxidized to produce humic substances, reversing the natural process of coal formation under anoxic and reducing conditions. This form of "mineral-derived fulvic acid" is widely used in ...
Darker colored water can be seen in the right half of this experiment in a lake, with the giant Secchi disk appearing more brown in color due to higher dissolved organic matter concentrations. Colored dissolved organic matter (CDOM) absorbs light, making the water appear darker or tea-colored. Absorption by CDOM is one measure of water clarity.
The aquatic microbial loop is a marine trophic pathway which incorporates dissolved organic carbon into the food chain.. The microbial loop describes a trophic pathway where, in aquatic systems, dissolved organic carbon (DOC) is returned to higher trophic levels via its incorporation into bacterial biomass, and then coupled with the classic food chain formed by phytoplankton-zooplankton-nekton.
In freshwater bodies organic material from plants can form a silt known as mulm or humus on the bottom. This material, some called undissolved organic carbon breaks down into dissolved organic carbon and can bond to heavy metal ions via chelation. It can also break down into colored dissolved organic matter such as tannin, a specific form of ...