Sentences with phrase «airborne fraction»
The phrase "airborne fraction" refers to the proportion or fraction of a substance or particle that is floating or suspended in the air. It helps scientists understand how much of a pollutant or gas like carbon dioxide remains in the air rather than being absorbed by other processes. Full definition
The annual airborne fraction is the ratio of the atmospheric increase in a given year to that year's total emissions.
en.wikipedia.org
The model was not expected to be able to determine airborne fraction.
The only way this relationship could be linear would be if an increase in airborne fraction cancels out the logarithmic relationship between CO2 concentrations and radiative forcing.
The annual airborne fraction increased at a rate of 0.25 ± 0.21 % per year over the period 1959 — 2006.
«The proportionality of warming to cumulative emissions depends in part on a cancellation of the saturation of carbon sinks with increasing cumulative emissions (leading to a larger airborne fraction of cumulative emissions for higher emissions) and the logarithmic dependence of radiative forcing on atmospheric CO2 concentration [leading to a smaller increase in radiative forcing per unit increase in atmospheric CO2 at higher CO2 concentrations; Matthews et al. (2009)-RSB-.
Each effect is given in terms of its impact on the mean airborne fraction over the simulation period (typically 1860 to 2100), with bars showing the uncertainty range based on the ranges of effective sensitivity parameters given in Tables 7.4 and 7.5.
As of 2006 the annual airborne fraction for CO2 was about 0.45.
Empirical data for the CO2 «airborne fraction», the ratio of observed atmospheric CO2 increase divided by fossil fuel CO2 emissions, show that almost half of the emissions is being taken up by surface (terrestrial and ocean) carbon reservoirs [187], despite a substantial but poorly measured contribution of anthropogenic land use (deforestation and agriculture) to airborne CO2 [179], [216].
Accordingly, the «airborne fraction» of carbon is on the rise — it just has no where else to go.
The clear evidence is that this is not happening and the airborne fraction remains approximately constant.
If we assume that terrestrial uptake closely matches land use emissions, (this is essentially the IPCC assumption), and we know that the airborne fraction from 1964 through 2003 had a weighted average of 58 %, to shift to a long term 40 year  1/2 life from a near term 11 year  1/2 life, we would have to have prior 40 year period weighted average airborne fractions like 80 % for» 24 -» 63, and near 90 % before that.
As the airborne fraction has been steadily dropping, this may be realistic.
That's why it's not implausible that the airborne fraction of anthropogenic might not be declining.
Steve, The ratio of human emissions to increment in air ppm is called the airborne fraction, and I think Wiki gives a fair summary of opinion about it — it had been thought to be remarkably stable, but some people think it is changing recently.
There have been several recent studies determining the airborne fraction.
They found the airborne fraction increased by 3 ± 2 % per decade.
The airborne fraction is calculated from the rate of human CO2 emissions and changes in atmospheric CO2 concentration.
The 2007 IPCC verdict on the airborne fraction was «There is yet no statistically significant trend in the CO2 growth rate since 1958....
Knorr finds that since 1850, the airborne fraction has eemained relatively constant.
Unfortunately, some skeptics use this uncertainty to hold the position that the airborne fraction is closer to 0 %.
If the airborne fraction is increasing, it is possibly a recent phenomenon due to natural carbon sinks losing their absorption ability after becoming saturated.
While there are questions over how much the airborne fraction is increasing, it is clear that the total amount of CO2 in the atmosphere is increasing dramatically.
Trends in the sources and sinks of carbon dioxide (Le Quere 2009) examines the airborne fraction from 1959 to 2008.
But is the airborne fraction increasing?
The «airborne fraction» refers to the amount of human CO2 emissions remaining in the atmosphere.
This «airborne fraction» has shown little variation over this period.»
The airborne fraction remained level at around 43 %.
Because of this uncertainty, scientists are currently debating whether the airborne fraction is steady at 43 % or slightly Increasing from 43 %.
Around 43 % remains in the atmosphere - this is called the «airborne fraction».
The noise in the airborne fraction was reduced by removing the variability associated with El Nino Southern Oscillation (ENSO) and volcanic activity.