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 ?
Our research clearly shows that recycling more and eating less meat could provide a key to rebalancing the global carbon cycle.
Algae play key roles in the global carbon cycle, sometimes helping sequester significant amounts of carbon but can also turn the ocean waters brown or green and disrupt an ecosystem.
The shift, however, could impact food security, biofuels and the global carbon cycle.
The study represents a meticulous compilation of the work of others as well as his own research in this area, which includes ocean acidification, climate change, and the global carbon cycle.
According to a report in Nature News, Mario Lebrato, a PhD student at the Leibniz Institute of Marine Science in Germany, suspected that bottom-dwelling animals such as echinoderms also store large amounts of calcium carbonate, and wondered how large a role they might have in the global carbon cycle.
SMOS not only contributes towards our understanding of the global water cycle but also has the potential to improve our understanding of the global carbon cycle.
While river transport of carbon to the ocean is not on a scale that will bail humans out of our CO2 problem, we don't actually know how much carbon the world's rivers routinely flush into the ocean -- an important piece of the global carbon cycle.
With PACE, we will learn more about the role of marine phytoplankton in the global carbon cycle.
The new estimates come from the Global Carbon Project, an international effort to track the global carbon cycle, from sky to sea, Salik said.
CARBON OBSERVATORY/NASA: NASA's Orbiting Carbon Observatory-2, or OCO-2, is designed to study the global carbon cycle from a whole new perspective.
The detailed mechanisms of how the oceans contribute to this global carbon cycle at the microscopic scale, and which microbes have a leadership role in the breakdown process, are complex and convoluted problems to solve.
Their research was also looking at the circulation of the Southern Ocean and its impact on the global carbon cycle and looking at the sub-Antarctic islands as thermometers of climatic change by examining trees, peats and lakes.

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