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Dissolved organic carbon
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Dissolved organic carbon is the fraction of organic carbon operationally defined as that which can pass through a filter with a pore size typically between 0.22 and 0.7 micrometers. The fraction remai
Colour differences in DOC collected from coastal waters Filtered (0.2 μm) coastal marine waters collected at various locations around the United Kingd
Colour differences in DOC collected from coastal waters Filtered (0.2 μm) coastal marine waters collected at various locations around the United Kingdom. The differences in colour is due to the range of soil-derived carbon input to the coastal water, with dark brown (left) indicating a high soil-derived carbon contribution and near-clear water (right) indicating a low soil-derived carbon contribution.
Sources and sinks of dissolved organic carbon in the soil system
Sources and sinks of dissolved organic carbon in the soil system
DOC and POC — DIC and PIC Inland waters primarily receive carbon from terrestrial ecosystems. This carbon (1.9 Pg C y−1) is transported to the oceans
DOC and POC — DIC and PIC Inland waters primarily receive carbon from terrestrial ecosystems. This carbon (1.9 Pg C y−1) is transported to the oceans (0.9 Pg C y−1), buried in the sediments (0.2 Pg C y−1) or emitted as CO2 (0.8 Pg C y−1). More recent estimations are different: In 2013, Raymond et al. claimed CO2 emission from inland waters can be as high as 2.1 Pg C y−1. P = photosynthesis R = respiration
Simplified view of the main sources (black text; underlined are the allochthonous sources) and sinks (yellow text) of the oceanic dissolved organic ca
Simplified view of the main sources (black text; underlined are the allochthonous sources) and sinks (yellow text) of the oceanic dissolved organic carbon (DOC) pool. Main sources Most commonly referred sources of DOC are: atmospheric (e.g., rain and dust), terrestrial (e.g., rivers), primary producers (e.g., microalgae, cyanobacteria, macrophytes), groundwater, food chain processes (e.g., zooplankton grazing), and benthic fluxes (exchange of DOC across the sediment-water interface but also from
Particulate organic matter
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Particulate organic matter is a fraction of total organic matter operationally defined as that which does not pass through a filter pore size that typically ranges in size from 0.053 millimeters to 2
Dissolved organic carbon
…as that which can pass through a filter with a pore size typically between 0.22 and 0.7 micrometers. The fraction remaining on the filter is called particulate organic carbon (POC). Dissolved organic matter (DOM) is a closely related term often used interchangeably with DOC. While DOC refers specifically to the mass of carbon…
Marine particulate organic carbon (POC) POC includes components of living cells as well as dead material (detritus), and originates from both allochth
Marine particulate organic carbon (POC) POC includes components of living cells as well as dead material (detritus), and originates from both allochthonous and autochthonous sources. The POC pool can also exchange material with the dissolved OC (DOC) pool through aggregation and disaggregation of particles. This process and others may be involved in the formation of the molecularly uncharacterized component (MUC), which may incorporate both autochthonous and allochthonous OC.
Mean annual POC export at 100 m across the Southern Ocean
Mean annual POC export at 100 m across the Southern Ocean