No Rise of No Rise of Atmospheric Carbon Dioxide in Last 160 Years

From Science Daily:

ScienceDaily (Dec. 31, 2009) — Most of the carbon dioxide emitted by human activity does not remain in the atmosphere, but is instead absorbed by the oceans and terrestrial ecosystems. In fact, only about 45 percent of emitted carbon dioxide stays in the atmosphere.

However, some studies have suggested that the ability of oceans and plants to absorb carbon dioxide recently may have begun to decline and that the airborne fraction of anthropogenic carbon dioxide emissions is therefore beginning to increase.

Many climate models also assume that the airborne fraction will increase. Because understanding of the airborne fraction of carbon dioxide is important for predicting future climate change, it is essential to have accurate knowledge of whether that fraction is changing or will change as emissions increase.

To assess whether the airborne fraction is indeed increasing, Wolfgang Knorr of the Department of Earth Sciences at the University of Bristol reanalyzed available atmospheric carbon dioxide and emissions data since 1850 and considers the uncertainties in the data.

In contradiction to some recent studies, he finds that the airborne fraction of carbon dioxide has not increased either during the past 150 years or during the most recent five decades.

The research is published in Geophysical Research Letters.

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Story Source:

Adapted from materials provided by American Geophysical Union, via EurekAlert!, a service of AAAS.
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Journal Reference:

Knorr, W. Is the airborne fraction of anthropogenic CO2 emissions increasing? Geophysical Research Letters, 2009; 36 (21): L21710 DOI: 10.1029/2009GL040613

3 comments:

Matthew Avitabile said...

Won't see this in Gore's films

USA real estate said...

it is essential to have accurate knowledge of whether that fraction is changing or will change as emissions increase.

Anonymous said...

Science Daily has since changed their erroneous headline.
The study did not in anyway say or imply that the quantity of CO2 in the air has not massively increased over the decades. There is no controversy on that point whatsoever.

The study simply proposed that 57% of the CO2 released by humans was removed 150 years ago, and 57% is being removed today. However we are emitting many, many, many times as much CO2 now as then.

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