Sentences with phrase «cooling effect of aerosols»

However, there is also the global cooling effect of aerosols (such as in nuclear winter).

The estimated warming of 2.4 °C is the equilibrium warming above preindustrial temperatures that the world will observe even if GHG concentrations are held fixed at their 2005 concentration levels but without any other anthropogenic forcing such as the cooling effect of aerosols.

I also predict it will be accompanied by studies showing either: a) The quantity of atmospheric aerosol from the 40's -70's is much less than previously thought b) The cooling effect of aerosols is much less significant than previously thought

«It is well understood that [aerosols»] presence is masking a substantial amount of greenhouse gas warming,» says Cat Scott, a research fellow at the University of Leeds whose own work has helped scientists understand the cooling effect of aerosols.

These approaches exclude the cooling effect of aerosols.

But this also means the slight cooling effect of aerosols is reduced, and the world is a little warmer as a result.

The reason is that without the cooling effect of aerosols formed from certain emissions, the models significantly overpredict warming from greenhouse gases.

However, this offsetting effect is unlikely to remain in the future as improved pollution controls are expected to significantly reduce the cooling effect of aerosols over the course of coming decades: Meinshausen et al (2006).

At the very least, the science indicates that we ought to consider cancelling the «acid rain» controls and take advantage of the cooling effect of the aerosols to buy us some time against greenhouse warming.

The cooling effect of aerosols has been known for some time.

... Schneider became aware that he had overestimated the cooling effect of aerosols, and underestimated the warming effect of CO2 by a factor of about three.

You say» Needless to say, one would expect a strong cooling effect of the aerosols over that station.

This is because of the warming effect of non-CO2 greenhouse gases usually equalling or exceeding the cooling effect of aerosols.

The respondents» quantitative estimate of the GHG contribution appeared to strongly depend on their judgment or knowledge of the cooling effect of aerosols.

Well it's even more complex than that because the net warming from humans doesn't just involve CO2, but other greenhouse gases and it factors in the cooling effect of aerosols being dwarfed by the CO2 forcing.

The cooling effect of aerosols never materialized but the warming effect of CO2 has steadily risen since Robock's simple model runs.

In fact, the rate of change of CO2 levels actually drops slightly after a volcanic eruption, possibly due to the cooling effect of aerosols.

Greenhouse gases contributed a global mean surface warming likely to be in the range of 0.5 °C to 1.3 °C over the period 1951 − 2010, with the contributions from other anthropogenic forcings, including the cooling effect of aerosols, likely to be in the range of − 0.6 °C to 0.1 °C.

• Greenhouse gases contributed a global mean surface warming likely to be in the range of 0.5 °C to 1.3 °C over the period 1951 to 2010, with the contributions from other anthropogenic forcings, including the cooling effect of aerosols, likely to be in the range of − 0.6 °C to 0.1 °C.

The contribution of greenhouse gases is greater than the observed warming, while the total anthropogenic contribution is thought to be around 0.7 °C because of the cooling effect of aerosols.

The NIPCC report makes the * opposite * claim as Lindzen does, namely that «The IPCC dramatically underestimates the total cooling effect of aerosols.»

But the cooling effect of aerosols incorporated in current models is much larger.

This is a peer reviewed paper by respected scientists who are saying that aerosol forcing means that the majority of the warming caused by existing co2 emission has effectively been masked thus far, and that as aerosols remain in the atmosphere for far shorter a duration of time than co2, we will have already most likely crossed the 2 degree threshold that the G8 politicians have been discussing this week once the cooling effect of aerosols dissipate.

Research by an international team of scientists recently published in the journal Geophysical Research Letters says that the cooling effect of aerosols is so large that it has masked as much as half of the warming effect from greenhouse gases.

The cooling effect of aerosols is not an assumption or a hypothesis.

Past calculations of the cooling effect of aerosols have been inferred from «missing» global warming predicted by climate models.

«By reducing the amount of coal, we reduce the cooling effect of the aerosols.»

The cooling effect of aerosols can partly offset global warming on a short - term basis, but many are made of organic material that comes from sources that scientists don't fully understand, said Joost de Gouw, a research physicist at NOAA's Earth System Research Laboratory in Boulder, Colo., who is unaffiliated with the studies.

These underestimate the global cooling effects of aerosol pollution, so also underestimate sensitivity.

The warming commitment if we stop all human emissions (GHG and aerosol) is probably very substantial: The cooling effect of the aerosol will very quickly disappear, thereby «unmasking» the greenhouse warming, approximately half of which has been canceled by aerosol cooling up to now.

Or equivalently, since the aerosols are anthropogenic, that European temperatures had been subdued due to the cooling effects of the aerosols — and since they are now decreasing, the full effects of the greenhouse gases are starting to be felt.

Basically, the dimming and cooling effect of aerosol accumulation is beginning to lift away.

The leveling off between the 1940s and 1970s may be explained by natural variability and possibly by cooling effects of aerosols generated by the rapid economic growth after World War II.

He chose a figure which represented model simulations of temperature responses only to greenhouse gas changes, which neglects for example the temperature response to the cooling effects of aerosols.

The overwhelming uncertainty in determining TCR from historical data is the uncertainty about the historical net warming or cooling effects of aerosols as discussed in Lewis and Curry (2014).

Then, after giving a talk to the Bush - Cheney White House, he agonized about whether he should have ignored the cooling effects of aerosols because it gave Cheney an «out,» enabling him and others to make the specious argument that aerosols somehow balance out the trillions of tons of CO2 emitted every year.

Ramanathan and Carmichael (2008), on the other hand, examined both the warming and cooling effects of aerosols.

«Between the Fourth and Fifth [IPCC] Assessment Reports the best estimate of the cooling effect of aerosol pollution was greatly reduced.

This is before accounting for the cooling effects of aerosols.

Aerosols Many of the proposed feedbacks involve the cooling effects of aerosols.

Atmospheric carbon dioxide equivalent levels were around 455 ppm CO2 - e in 2005 if you ignore the cooling effects of aerosols but around 375 ppm CO2 - e in 2005 if you include the cooling effects of aerosols and landuse changes: see the IPCC (2007) Working Group III report at page 102, available at http://www.ipcc.ch/pdf/assessment-report/ar4/wg3/ar4-wg3-chapter1.pdf.

Lindzen has also not accounted for the possible cooling effects of aerosols, which, if ignored, also lead to an underestimate of climate sensitivity

This is because the net warming it reports includes the cooling effects of aerosols which partly masks the warming caused by greenhouse gases.

Tall smokestacks effectively reduce ground - level air pollution, but they do not reduce the cooling effect of aerosol / particulate pollution.

He adds that Lindzen has also not accounted for the possible cooling effects of aerosols, which, if ignored, also lead to an underestimate of climate sensitivity.

The warming commitment if we stop all human emissions (GHG and aerosol) is probably very substantial: The cooling effect of the aerosol will very quickly disappear, thereby «unmasking» the greenhouse warming, approximately half of which has been canceled by aerosol cooling up to now.

Not exact matches

Overall these aerosol effects promote cooling that could offset the warming effect of long - lived greenhouse gases to some extent.

Scientists can measure how much energy greenhouse gases now add (roughly three watts per square meter), but what eludes precise definition is how much other factors — the response of clouds to warming, the cooling role of aerosols, the heat and gas absorbed by oceans, human transformation of the landscape, even the natural variability of solar strength — diminish or strengthen that effect.

Besides SSCE, scientists have also been investigating stratospheric sulfur injections — firing sun - reflecting aerosols into the air, similar to the cooling effect after a volcanic eruption — and cirrus cloud thinning, where you thin the top level of clouds, which have a warming effect on the planet.

Forster's chapter also reports on another important uncertainty: the cooling effect of smoke and other aerosols, which some argued almost negated the warming effect of greenhouse gases in the short term.