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 A Decline in the Northern Hemisphere CO2 Sink from 1992 to 2003

The Fate of Fossil-Fuel Emissionsby John Miller

Increases in the north-south gradient of atmospheric CO2 at Northern Hemisphere measurement sites of the NOAA/CMDL Global Air Sampling Network reveal a shrinking carbon sink. 14 of 16 low altitude sites show differences with South Pole increasing at a faster rate than can be explained by fossil fuel emissions, resulting in an average north-south difference at remote marine sites nearly 1 ppm larger in 2003 than in 1992. Regardless of whether this trend will persist, it shows that large changes in the carbon cycle can occur rapidly and is a strong indication of the tenuous nature of terrestrial carbon sinks.

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A 50 Year Record of Atmospheric CO2 and Its Relation to Fossil Fuel Emissions


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Re: A Decline in the Northern Hemisphere CO2 Sink from 1992 to 2003 (Score 2, Informative)
by James.H.Butler on Monday, September 26 @ 15:58:11 MDT
(User Info)http://www.cmdl.noaa.gov/hats/personnel/butler/butler1.html
Changes in net flux are, of course, a function of changes in one or both gross fluxes.  Do we have any information that hints at whether a change in either the inward or outward gross flux drives the net change?



Re: A Decline in the Northern Hemisphere CO2 Sink from 1992 to 2003 (Score 2, Interesting)
by Philippe.Ciais on Tuesday, September 27 @ 10:35:37 MDT
(User Info)
Nice talk ; Is there any evidence that plant discrimination could have changed recently (eg because of droughts). Could that be looked at from the short term residuals of 13C and CO2 ?






The 7th International CO2 Conference

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September 25th - 30th
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