Sentences with phrase «forcing has no effect on climate»

Foukal et al did not claim to show that solar forcing has no effect on climate, merely that there is no positive evidence for a longer term forcing larger than seen over the 11 year cycle.

Not exact matches

Earlier studies on the sensitivity of tropical cyclones to past climates have only analyzed the effect of changes in the solar radiation from orbital forcing on the formation of tropical cyclones, without considering the feedbacks associated to the consequent greening of the Sahara.

This attempt at quantification of the many different forces effect on the climate has re-emphasized the complexity of the climate system and the simultaneous interaction of many influences.

Now if this was the 1980s they might have had a point, but the fact that aerosols are an important climate forcing, have a net cooling effect on climate and, in part, arise from the same industrial activities that produce greenhouse gases, has been part of mainstream science for 30 years.

The indirect aerosol effect on clouds is non-linear [1], [76] such that it has been suggested that even the modest aerosol amounts added by pre-industrial humans to an otherwise pristine atmosphere may have caused a significant climate forcing [59].

Gay, Lesbian and Straight Education Network (GLSEN): Since homophobia and heterosexism undermine a healthy school climate, GLSEN works to educate teachers, students and the public at large about the damaging effects these forces have on youth and adults alike.

From the Physical Science Basis: «Shindell et al. (2009) estimated the impact of reactive species emissions on both gaseous and aerosol forcing species and found that ozone precursors, including methane, had an additional substantial climate effect because they increased or decreased the rate of oxidation of SO2 to sulphate aerosol.

Through paleo - climate simulations for the last millennium with climate models, a number of alternate forcing histories for volcanic and solar changes have been proposed to see their effect on past climate variations.

One can see a number of basic flaws here; the complete lack of appreciation of the importance of natural variability on short time scales, the common but erroneous belief that any attribution of past climate change to solar or other forcing means that CO2 has no radiative effect, and a hopeless lack of familiarity of the basic science of detection and attribution.

For instance, closing the Isthmus of Panama (4.5 millions years ago) was obviously a forcing that likely had profound effects on the climate — it wouldn't be easy to characterise in radiative terms though.

Some attribution assessments that link events to dynamically driven changes in circulation have been criticized on the grounds that small signal - to - noise ratios, modeling deficiencies, and uncertainties in the effects of climate forcings on circulation render conclusions unreliable and prone to downplaying the role of anthropogenic change.

I had been preparing comments to explain — how LW radiative forcing (greenhouse effect) works, why forcing from CO2 is approximately linearly proportional to CO2 at sufficiently small amounts of CO2 and approximately logarithmically proportional to CO2 within a range of larger amounts, and then how the climate responds to forcings, but that got very very long and so I'm going to hold off on that.

[Dr. Carling has] the complete lack of appreciation of the importance of natural variability on short time scales, the -LSB-...] erroneous belief that any attribution of past climate change to -LSB-...] other [than CO2] forcing means that CO2 has no radiative effect, and a hopeless lack of familiarity of the basic science of detection and attribution.

Right now, since we do not have accurate forcing functions for any of these factors going back to the medieval period it is difficult to say with any precision which one (or combination) caused the climate change and what effects that had on CO2.

3 - These assumptions themselves are based on assumptions (that internal forcings have no influence and that forcing is external and that we understand the effects this will have - inc. climate sensitivity) 4 - THESE assumptions are based on the assumption that we know enough about the system to make these sort of judgements.

The effect of this mixed dust - pollution plume on the Pacific cloud systems and the associated radiative forcing is an outstanding problem for understanding climate change and has not been explored.

PHYS.org: Changes in solar radiation, known as solar forcing, have had only a very small effect on climate change, a member of the UN's top panel of climate scientists said today.

Cutting down forests has reduced the planet's CO2 absorption capacity, and other land use changes have had a net forcing effect on climate.

If we could get a much better handle on the causes, effects, and timing of the natural variability, thus removing more of the unknowns from the weather / climate equation, it would be much easier to see the actual amounts of CO2 forcing.

In effect, they have traced climate history back to a very different world, long before the European discovery of America; a world in which Christian crusaders fought the Saracen forces for control of Jerusalem; in which the armies of Byzantium held the eastern Roman Empire against assault from the Turks; in which the temples of Angkor Wat were first built; in which work on the great cathedrals of Europe began; in which Venice began to emerge as a great maritime power; in which the first European universities began to take shape.

Combining these forcing periods, you would expect that, over extended periods of time, the effects of extreme proxigean spring tides should manifest themselves in the climate indices on time scales that are set by the beat periods between these two fundamental time scales.

We instead conclude that solar forcing probably had a minor effect on Northern Hemisphere climate over the past 1,000 years, while, volcanic eruptions and changes in greenhouse gas concentrations seem to be the most important influence over this period.

Clouds» impact on climate would obviously change as the world warms (a feedback) but, if solar - magnetic effects change clouds, as now seems likely, clouds could also drive climate change (a forcing).6, 7

Also, would it be correct to interpret POGA - C as the indirect effect on global temperatures of climate forcing in the Tropical East Pacific?

But including aerosol indirect effects on radiative forcing has made it easier to generate a greater variety of 20th century simulations without affecting other aspects of the climate simulation as strongly.

«More CO2 promotes more plant growth both on land and throughout the surface waters of the world's oceans, and this vast assemblage of plant life has the ability to affect Earth's climate in several ways, almost all of them tending to counteract the heating effects of CO2's thermal radiative forcing.»

Practically, more deep - ocean involvement does have an effect on equilibrium climate sensitivity, but it has a much larger effect on transient climate sensitivity (which is a more relevant parameter for discussions of anthropogenically forced climate change).

«Errors in external forcing data (Santer et al's preferred explanation) Internal variability (which has been supported by numerous previous studies, including posts at CE) Values of CO2 climate sensitivity that are too high (interesting new post on this over at ClimateAudit) Missing physical processes in the climate models (e.g. solar indirect effects).»

Jim D: The forcing change under BAU in the 21st century will be 2.5 times that in the 20th century, so even if it was (dubiously) only 50 % then, it will be that much larger going forwards, and should be easily the dominant effect on climate.

Changes in solar radiation, known as solar forcing, have had only a very small effect on climate change, a member of the UN's top panel of climate scientists said today.

Climate change is already having «pervasive, wide - ranging» effects on «nearly every aspect of our society,» a task force representing more than 20 federal agencies reported Tuesday.

This new NASA paper builds upon those previous studies by better quantifying the efficiencies of different forcings over the historical period and the effect this has on energy budget approach climate sensitivity estimates.

Climate Science however was established with the premise that humans are having a catastrophic effect on the climate, primarily by forcing global warming through the emission of ACO2, and charged with the mission of confirmClimate Science however was established with the premise that humans are having a catastrophic effect on the climate, primarily by forcing global warming through the emission of ACO2, and charged with the mission of confirmclimate, primarily by forcing global warming through the emission of ACO2, and charged with the mission of confirming it.

Any climate forcing (whether natural or human induced) would be so strongly damped as to hardly have any effect on global temperatures.

I am assuming Scafetta has not analyzed the forces from Jupiter and Saturn to see what effect they might have on Earth low frequency (climate) ocean up / downwelling cycles or anything like that.

Forster et al. (2007) described four mechanisms by which volcanic forcing influences climate: RF due to aerosol — radiation interaction; differential (vertical or horizontal) heating, producing gradients and changes in circulation; interactions with other modes of circulation, such as El Niño - Southern Oscillation (ENSO); and ozone depletion with its effects on stratospheric heating, which depends on anthropogenic chlorine (stratospheric ozone would increase with a volcanic eruption under low - chlorine conditions).

Clouds are not a forcing of the climate system (except for the small portion related to human related aerosol effects, which have a small effect on clouds).

It's only tangentially related to climate change discussions, but a microclimate in Death Valley, California has given rise to some interesting physical effects and much controversy regarding the ways big heavy rocks can be seen to have moved around on the bottom of a playa lake, untouched by external, unnatural forces.