This tutorial introduces the carbon cycle

A summary of the processes described above is presented in in the form of a box model of the carbon cycle at equilibrium for preindustrial conditions. Uptake by the biosphere and by the oceans represent sinks of comparable magnitude for atmospheric CO2, resulting in an atmospheric lifetime for CO2 of 5 years. On the basis of this short lifetime and the large sizes of the oceanic and terrestrial reservoirs, one might think that CO2 added to the atmosphere by fossil fuel combustion would be rapidly and efficiently incorporated in these reservoirs. However, as we have seen, uptake of added CO2 by the biosphere is subject to other factors limiting plant growth, and uptake of added CO2 by the ocean is limited by acidification and slow mixing of the ocean.

2 cycles | Carbon Cycle | Photosynthesis - Scribd

Respiration and photosynthesis are both related to the production/release of carbon ..

Photosynthesis Cellular Respiration Lab Key2 - Scribd

An additional pathway for CO2 uptake involves photosynthesis by phytoplankton. The organic carbon produced by phytoplankton moves up the food chain and about 90% is converted eventually to CO2(aq) by respiration and decay within the oceanic mixed layer. The 10% fraction that precipitates (fecal pellets, dead organisms) represents a biological pump transferring carbon to the deep ocean. The biological productivity of the surface ocean is limited in part by upwelling of nutrients such as nitrogen from the deep (), so that the efficiency of the biological pump is again highly dependent on the vertical circulation of the ocean water. It is estimated that the biological pump transfers 7 Pg C yr-1 to the deep ocean, as compared to 40 Pg C yr-1 for CO2(aq) transported by deep water formation.

Photosynthesis Cellular Respiration Lab Key2

This cycling of O2 with the lithosphere is illustrated in . Atmospheric O2 is produced during the formation of reduced sedimentary material, and the consumption of O2 by weathering when this sediment is eventually brought up to the surface and oxidized balances the O2 source from sediment formation. Fossil records show that atmospheric O2 levels have in fact not changed significantly over the past 400 million years, a time scale much longer than the lifetime of O2 against loss by weathering. The constancy of atmospheric O2 suggests that there must be stabilizing factors in the O2-lithosphere cycle but these are still poorly understood. One stabilizing factor is the relative rate of oxidation vs. burial of organic carbon in the ocean. If sediment weathering were to increase for some reason, drawing down atmospheric O2, then more of the marine organic carbon would be buried (because of slower oxidation), which would increase the source of O2 and act as a negative feedback.

Intergovernmental Panel of Climate Change, Climate Change 1994, Cambridge University Press, 1995. Carbon cycle.
Photosynthesis; Carbon Dioxide; Cellular Respiration; Oxygen; Water; Rating and Stats

Plants: Photosynthesis and The Carbon Cycle - YouTube

Most of the chemicals that make up living tissue contain carbon. When organisms die the carbon is recycled so that it can be used by future generations. The model that describes the processes involved is called the carbon cycle.

Photosynthesis, Respiration, and the ATP-ADP Cycle …

Amplitude of carbon dioxide diurnal cycle in Biosphere 2 much larger than for free atmosphere (see for example Mauna Loa CO2 record, )

The carbon cycle is inextricably linked to other chemical cycles, ..

The previous plot shows how the atmospheric CO2 changes with light levels. Now predict the photosynthetic response to varying light levels (or in other words, how the rate of carbon uptake by plants changes with light level).