atmospheric carbon rising faster from varting mechanisms....



part of the increase is due to the lower efficiencies of the 'new'
economies which is increasing the amount of carbon per $
of output...a figure which had been falling for 30 years

these changes are likely to bring forward the levels of warming to
be expected at given time scales....



"..increasing by 1.93 parts per million each year--the fastest rate of
buildup since monitoring activities began in 1959 and considerably
higher than the 1.58-ppm average for the 1980s and the 1.49 ppm for
the 1990s."

http://sciencenow.sciencemag.org/cgi/content/full/2007/1022/1?rss=1
"An international team of scientists has taken another look at how
rapidly Earth's atmosphere is absorbing carbon dioxide (CO2)--the
biggest greenhouse gas in terms of volume--and the news is not good: A
high-flying world economy is pumping out the gas at an unprecedented
rate. Current CO2 production is outstripping the best estimates used
by modelers to predict future climate trends.

Earth's climate has been warming for the past century or so,
particularly during the past 40 years. Scientists say the blame most
likely belongs to an increase in the greenhouse effect, caused by
human output of CO2, methane, and types of fluorocarbons. The U.N.
Intergovernmental Panel on Climate Change cites human activity as the
biggest contributor to the phenomenon known as global warming.

During the past half-century, scientists have been closely monitoring
the changes in the atmosphere and have constructed elaborate computer
models to project what will happen if current trends in CO2 output
continue. What's going on now in the real world is surpassing the
assumptions of the climate models."
.....


meanwhile indications that oceanic absorption of carbon is decreasing.

http://www.sciam.com/article.cfm?chanID=sa003&articleID=C92C3262-E7F2-99DF-30FA22A938862F9A
"Specifically, oceans and plant growth absorbed only around 540
kilograms per metric ton (1,190 pounds per short ton) of the CO2
produced in 2006, compared with 600 kilograms per metric ton (1,322
pounds per short ton) in 2000..."
....
"All told, human activity released 9.9 billion metric tons (2.18 x
1013 pounds) of carbon in 2006, up from just 8.4 billion metric tons
(1.85 x 1013 pounds) in 2000. At the same time, poleward shifts of
westerly winds in the Southern Ocean reduced the region's ability to
suck up CO2 as have mid-latitude droughts, which slowed the growth
rate of forests and plants that capture carbon.

New maritime measurements over the past decade also show that the
North Atlantic's ability to absorb CO2 has been cut in half, according
to researchers from the University of East Anglia who were not
affiliated with the study by Canadell and his colleagues. "Until now,
we thought that the decline in the efficiency of natural sinks was
going to happen during the 21st century and more strongly during [its]
second half," Canadell says. "If we didn't [include in the
assumptions] that this was going to happen [so soon], have we
underestimated the decline in the efficiency into the future?" "



related item
http://www.abelard.org/briefings/global_warming.htm

regards....

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