Sentences with phrase «aerosol cooling offsetting»

perseus @ 2 - the pre-1975 ocean data in this paper look similar to the surface data, in that they did not warm much during mid-century, likely due to aerosol cooling offsetting greenhouse gas warming.

Not exact matches

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

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.

That means that a climate with a lot of CO2 warming partially offset in the global average by a lot of regional aerosol cooling is still a very different climate than one with no anthropogenic aerosols and less CO2.

During that period, moreover, there were no constraints on the burning of coal whatsoever, thus no constraints on the production of the sort of aerosols currently claimed to have a cooling effect on the atmosphere strong enough to offset the effect of CO2 emission.

«A rapid cutback in greenhouse gas emissions could speed up global warming... because current global warming is offset by global dimming — the 2 - 3ºC of cooling cause by industrial pollution, known to scientists as aerosol particles, in the atmosphere.»

Your estimates of climate sensitivity come from the IPCC, which assumes that aerosols will continue to provide a very strong cooling effect that offsets about half of the warming from CO2, but you are talking about time frames in which we have stopped burning fossil fuels, so is it appropriate to continue to assume the presence of cooling aerosols at these future times?

Multi-signal detection and attribution analyses, which quantify the contributions of different natural and anthropogenic forcings to observed changes, show that greenhouse gas forcing alone during the past half century would likely have resulted in greater than the observed warming if there had not been an offsetting cooling effect from aerosol and other forcings.

These analyses indicate that it is likely that greenhouse gases alone would have caused more than the observed warming over the last 50 years of the 20th century, with some warming offset by cooling from natural and other anthropogenic factors, notably aerosols, which have a very short residence time in the atmosphere relative to that of well - mixed greenhouse gases (Schwartz, 1993).

Greenhouse gases can be attributed to about 0.9 °C of this warming, but it has been partially offset by about 0.3 °C cooling from human aerosol emissions.

In other words, there is some value that can be assigned to aerosol cooling that offsets high temperature sensitives to rising CO2 concentrations enough to mathematically spit out temperatures sortof kindof similar to those over the last decade.

The sensitivity of the earth's climate vs. GHG depends on how much GHG warming has been offset by cooling from aerosols.

How would the answer to this change if the pause was either A. an offset of GHG's and aerosols and other anthro cooling forcings, or B. an offset of GHG's by primarily (> 50 %) natural cooling trends?

If the maximum cooling ability of aerosols is only 1.0 Wm2, as Stevens suggests, the particles would offset only a third of warming caused by greenhouse gases.

• More than 100 % (i.e. GHG warming has been partly offset by aerosol cooling) • Between 76 % and 100 % • Between 51 % and 76 % • Between 26 % and 50 % • Between 0 and 25 % • Less than 0 % (i.e. anthropogenic GHG emissions have caused cooling) • There has been no warming • Unknown due to lack of knowledge • I do not know • Other (please specify)

In particular, increases in the number of small particles (called aerosols) in the atmosphere regionally offset and mask the greenhouse effect, and stratospheric ozone depletion contributes to cooling of the upper troposphere and stratosphere.fr2], fr3]

«In our mor recent global model simulations the ocean heat - uptake is slower than previously estimated, the ocean uptake of carbon is weaker, feedbacks from the land system as temperature rises are stronger, cumulative emissions of greenhouse gases over the century are higher, and offsetting cooling from aerosol emissions is lower.

This was offset by a cooling from other human influences (mainly from aerosols) of 0 to 0.5 °C.

Sure, there are issues with time delays and the possibility of some aerosol cooling to offset some of the warming, but none of these can even come close to closing a gap between 1F and 4F.

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).

But for that to drive a, say, half degree cooling effect that offsets CO2 warming, that would mean that cooling in these aerosol - affected areas would have to be 2.5 - 5.0 C in magnitude.

If aerosols were really offsetting half or more of the warming, we should see the opposite, with a toasty south and a cool north.

Perhaps it's due to a smaller global energy imbalance due to more aerosol cooling and lower solar activity offsetting more of the greenhouse gas - caused warming.

The resulting simulations show the cooling contribution of aerosols offset the ongoing warming effect of increasing greenhouse gases over the mid-twentieth century in that part of the Arctic.

We argue that this is the long - term anthropogenic trend, forced by greenhouse gas increases offset by tropospheric aerosol cooling, which also increased along with industrialization.

The warming that would have occurred from the greenhouse gas buildup has therefore been substantially offset by a cooling from aerosols.

A positive feedback of 2.4 C per doubling would give 0.6 C in this period, but we suspect aerosols caused cooling, so this could be regarded as a lower limit, unless other GHGs like methane have offset the aerosols.

Cooling of the ocean by aerosols must therefore be offset by a reduction in heat lost from the ocean to the atmosphere.