carbon cycle

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car·bon di·ox·ide cy·cle

, carbon cycle
the circulation of carbon as CO2 from the expired air of animals and decaying organic matter to plant life where it is synthesized (through photosynthesis) to carbohydrate material, from which, as a result of catabolic processes in all life, it is again ultimately released to the atmosphere as CO2.

carbon cycle

n.
1. Physics See carbon-nitrogen-oxygen cycle.
2. Ecology The combined processes, including photosynthesis, decomposition, and respiration, by which carbon as a component of various compounds cycles between its major reservoirs—the atmosphere, oceans, and living organisms.

carbon cycle

the steps by which carbon in the form of carbon dioxide is extracted from and returned to the atmosphere by living organisms, especially human beings. The process starts with the photosynthetic production of carbohydrates by plants, progresses through the consumption of carbohydrates by animals and human beings, and ends with the exhalation of carbon dioxide by those same animals and human beings and with the release of carbon dioxide during the decomposition of dead plants and animals. Various chemical processes intervene between the ingestion of carbohydrates and the release of carbon dioxide. Carbohydrate metabolism starts with the movement of glucose through plasma membranes and subsequently involves glycolysis, the processes of the citric acid cycle, electron transport, and oxidative phosphorylation. See also citric acid cycle.

carbon cycle

A general term for the flux of CO2 from the point of fixation by photosynthesis to its release into the atmosphere by anthropogenic activities.

car·bon di·ox·ide cy·cle

, carbon cycle (kahr'bŏn dī-oks'īd sī'kĕl)
The circulation of carbon as CO2 from the expired air of animals and decaying organic matter to plant life where it is synthesized (through photosynthesis) to carbohydrate material, from which, as a result of catabolic processes in all life, it is again ultimately released to the atmosphere as carbon dioxide.

carbon cycle

The important biological cycle in which carbon in carbon dioxide in the atmosphere is taken up by plants, incorporated, by photosynthesis, into carbohydrates which are eaten by animals, and the carbon then oxidised and finally returned to the atmosphere as carbon dioxide waste gas.
Carbon cycleclick for a larger image
Fig. 90 Carbon cycle . The main steps.

carbon cycle

the circulation of carbon by the metabolic processes of living organisms in an ECOSYSTEM so that it always returns to an arbitrary starting point.
References in periodicals archive ?
The global carbon cycle is affected by human activities and is coupled to other climatological and biogeochemical processes.
We use the term "carbon and greenhouse gas profile" to describe the overall picture of emissions, sequestration and related activities having important implications to the industry's connections to the global carbon cycle.
Richard Feely, another of the lead authors, adds: "These numbers are used to constrain the global carbon cycle models.
The scientific community has fairly well agreed on how the global carbon cycle works and how the way people use land affects it.
Practices such as cultivation, forest harvesting, and afforestation have differing effects on soil C input, accretion, and loss, complicating efforts to complete an accurate model of the global carbon cycle (Tans et al.
In the global carbon cycle, the major reservoirs are the oceans (including ocean sediments), the terrestrial biosphere (plus sedimentary rocks), and the atmosphere.
The depletion of oxygen in Earth's oceans leads to a massive disturbance in the global carbon cycle and has deleterious effects on marine life.
17 ( ANI ): Researchers have suggested that the latest climate modelling suggests that the length of time carbon remains in vegetation during the global carbon cycle is the key "uncertainty" to predict how Earth's terrestrial plant life - and consequently almost all life - will respond to higher CO2 levels and global warming.
The report provides the most up-to-date information on greenhouse gas emissions, the global carbon cycle, sea level rise, future climate projections, and more.
Scientists measure Earth's 'breaths': Computer models that couple carbon and climate are set to become more accurate thanks to two new studies into the global carbon cycle.
Maintaining and developing our research base in climate, atmospheric and oceanic sciences, and in the consequences of intervening in the global carbon cycle, is critical.

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