Sentences with phrase «co2 atmospheric lifetime»

Ray (7): I strongly agree, but I find this is a non-trivial challenge in climate communication, namely getting newcomers to understand that the current situation is quite urgent (current and locked - in emissions, long CO2 atmospheric lifetime, feedbacks, etc.) but that there's still a huge range of possible future outcomes.

Not exact matches

The seasonal cycle in atmospheric CO2 shows that the lifetime of a CO2 molecule in the air before it is exchanged with another in the land biosphere is about 12 years.

However, climate response time is surely less than the atmospheric lifetime of the human - caused perturbation of CO2.

But this is silly, since the atmospheric lifetime of aerosols is just a matter of days, so once we stop burning coal, as we eventually must, the aerosols disappear quickly, unmasking the pent - up warming due to all the extra CO2 we emitted by not switching from coal to natural gas.

I think I know what you mean here but in the context of the previous Much Ado about Methane article with discussion of the difference between atmospheric lifetime of a CO2 molecule vs. lifetime of an increase in concentration, this could also be put more clearly.

The IPCC have modelled that atmospheric CO2 has a lifetime of 50 - 100 years [1].

By using dual radioactive tracers with differing lifetimes, Wilson et al. [2017] found short term increases in CH4 and CO2 release during periods of thaw in a discontinuous permafrost were generally offset by long - term accumulation of peat in the ensuing millennia, leading the regions to continue to be net carbon sinks with negative atmospheric radiative forcing, given the long life - time of atmospheric CO2.

Common measures of the atmospheric lifetime of CO2, including the e-folding time scale, disregard the long tail.

However, there is ample empirical evidence that the atmospheric CO2 lifetime is quite short — 5 to 10 years.

Here, we review the past literature on the atmospheric lifetime of fossil fuel CO2 and its impact on climate, and we present initial results from a model intercomparison project on this topic.

«scientists have assumed» «The climate models assume» «assumption that Natural CO2 is totally fixed and unchanging» «if you assume a long lifetime for atmospheric CO2 ″ «falsification of the basic assumption» «it requires assumptions that violate empirical knowledge» «assumed so that the ice cores and modern measurements fit together» «arbitrary and unjustified assumption»

Essenhigh (2009) points out that the IPCC (Intergovernmental Panel on Climate Change) in their first report (Houghton et al., 1990) gives an atmospheric CO2 residence time (lifetime) of 50 - 200 years [as a «rough estimate»].

Certainly, CO2 and other anthropogenic GHG emissions are a potent driver of warming, with water serving in a feedback role due to its short atmospheric lifetime.

CH4 is relatively short - lived in the atmosphere (atmospheric lifetime on the order of a decade) relative to CO2 (atmospheric lifetime on the order of centuries) and therefore has a higher global warming potential over the shorter 20 - year time horizon (86 versus 34; Myhre et al. 2013).

The exception is nitrous oxide (N2O), which has an atmospheric lifetime comparable to, albeit different from, that of CO2 and, crucially, longer than the response time of the physical climate system.

At the end of The Long Thaw David Archer calculated the GHG warming induced from burning a gallon of gasoline over the atmospheric lifetime of the CO2 («bad energy») and compared it to the «good energy» we get from burning the gasoline today.

«Recent work indicates that recovery from a large input of atmospheric CO2 from burning fossil fuels will result in an effective lifetime of tens of thousands of years».

Sadly, you have conflated the average time that an individual CO2 molecule stays in the atmosphere before being replaced (called airborne residence time) with the time it takes the CO2 concentration to return to pre-pulse values after the addition of a pulse of CO2 to the atmosphere (called e-folding time or pulse decay time or atmospheric lifetime).

Revelle & Suess (1957) calculated from data for the trace atmospheric molecule 14CO2, containing the radioactive isotope14C, that the amount of atmospheric «CO2 derived from industrial fuel combustion» would be only 1.2 % for an atmospheric CO2 lifetime of 5 years, and 1.73 % for a CO2 lifetime of 7 years (Segalstad, 1998).

... Essenhigh (2009) points out that the IPCC (Intergovernmental Panel on Climate Change) in their first report (Houghton et al., 1990) gives an atmospheric CO2 residence time (lifetime) of 50 - 200 years....

CO2 concentrations are relatively well - distributed in the atmosphere, because its atmospheric lifetime is long compared to the time it takes to mix the atmosphere.

The temperature change due to the oxidized CO2 grows but also subsides more slowly than that from CH4, due to the weaker greenhouse forcing but longer atmospheric lifetime of the CO2.

[10] In particular, methane has a short atmospheric lifetime, whereas N2O and many F - gases have lifetimes comparable to CO2 or longer.

Both radioactive and stable carbon isotopes show that the real atmospheric CO2 residence time (lifetime) is only about 5 years, and that the amount of fossil - fuel CO2 in the atmosphere is maximum 4 %.

Examples of the atmospheric lifetime and GWP relative to CO2 for several greenhouse gases are given in the following table:

[39] A 2014 analysis, however, states that although methane's initial impact is about 100 times greater than that of CO2, because of the shorter atmospheric lifetime, after six or seven decades, the impact of the two gases is about equal, and from then on methane's relative role continues to decline.