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 ?
In addition it is also possible for such modelling analysis to assist policymakers to deliberate national carbon budgets while maintaining awareness of the global carbon budget.
The estimated global carbon budget in the report implies that annual emissions of global total greenhouse gases will need to fall to below 20GtCO2e by 2050, half the global annual emissions today, while sustaining a global economy nearly four times larger and global population one and a half times bigger.
With more than 50% of the land surface essentially consisting of complex terrain and a contribution to vertical exchange of MSCs comparable in magnitude to that of ABL mixing, it is likely that proper treatment of the former can alleviate substantial parts of the uncertainty associated with the land sink in the global carbon budget.
Because the amount of atmospheric carbon is well known and conservation of matter requires a balanced global carbon budget, this previously unaccounted for source of carbon to the atmosphere implies the existence of an additional continental carbon sink such as higher rates of biomass accrual in forests.
Clearly, any model of the global carbon budget must factor in El Nino as a major player.
China has surpassed Europe in terms of per capita emissions, according to the study titled Global Carbon Budget, An Annual Update Of The Global carbon Budget And Trends published on September 21.
Using biofuels to produce energy does not completely offset the need for other fossil fuels use and completely negate their input to the global carbon budget, the researchers found.
is based on International Energy Agency (IEA) simulation to determine global carbon budgets of reasonable emissions for companies in specific industries.

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