Interannual extremes in the rate of rise of atmospheric carbon dioxide since 1980

Article Abstract:

The interannual variations in global air temperature and precipitation are the main reasons for the disproportionate rise and fall in CO2 growth rate of the atmosphere, since 1980. This was analyzed by using the 13C/12C ratio of atmospheric CO2 to find the distinction between the effects of interannual variations in biospheric and oceanic sources and sinks of carbon. The lowering of the growth-rate of fossil-fuel combustion may have masked the climatic increase in CO2, making the drop in CO2 more dramatic once the climate shift reduced instead of increasing atmospheric CO2.

Measurement, Global warming, Carbon dioxide, Atmospheric carbon dioxide

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Increased activity of northern vegetation inferred from atmospheric CO2 measurements

Article Abstract:

The amplitude of the annual increase and decrease of atmospheric CO2 levels and the length of the vegetative growing period has increased since the 1960s. CO2 measurements taken at the Mauna Loa Observatory, Hawaii, show an increase of 20% while those taken at the Arctic stations in Point Barrow, Alaska, and Alert, Canada, show an increase of 40%. The increased amplitude of the carbon cycle is due to increased assimilation of CO2 by plants rather than merely short-term responses.

Analysis, Environmental aspects, Observations, Hawaii, Arctic regions, Vegetation dynamics, Plants, Effect of carbon dioxide on

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Dual modes of the carbon cycle since the Last Glacial Maximum

Article Abstract:

The stable-carbon-isotope composition (delta(super13)Co(sub2)) of CO(sub2) from air tapped in ice at Taylor Dome, Antarctica, from the Last Glacial Maximum to the onset of Holocence times, is presented. Two distinct primary modes are seen to have operated on a timescale of thousands of years, each have the stable-carbon-isotope composition of the net CO(sub2) exchanged by the atmosphere with the land and oceans.

Carbon cycle (Biogeochemistry), Carbon cycle

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