Sentences with phrase «positive warming feedback»

Two weeks ago we looked at the Triassic - Jurassic mass extinction, some 200 million years ago, that was caused by a large climatic warming event after the break - up of supercontinent Pangaea led to the release of enormous amounts of first [volcanic] CO2 and then methane [from disturbed clathrates — a positive warming feedback] into the atmosphere.

The cloud cover are likely not a forcing and thus a cause of warming but more likely a positive warming feedback.

With the theory of positive warming feedbacks thus neatly de-bunked, in a sane world we would see the end of cagw hysteria.

Not exact matches

One problem is that dangerous levels of climate change are exacerbated by positive feedback loops — changes that release more greenhouse gases from nature due to warming driven by humans.

Polyakov says a positive feedback loop is underway, in which less summer sea ice will lead to warmer winter waters and even less summer ice in subsequent years.

Extra carbon dioxide means a warmer world — and then positive feedback effects from things like water vapour and ice loss will make it warmer still

The findings suggest that effective new greenhouse gas controls could help lessen the effects of climate change on the release of carbon from soils of the northern permafrost region and therefore decrease the potential for a positive feedback of permafrost carbon release on climate warming.

The release of that carbon can, in turn, cause additional warming and the release of more carbon, something scientists call a positive feedback loop.

[So] there is potential that these tremendous stores of carbon in these soils can be a positive feedback for more warming.»

Sea ice reflects most of the sun's energy, he explained, whereas the open ocean absorbs more energy, and thus the disappearance of sea ice triggers even more warming, in a positive - feedback loop called albedo.

Those fluxes help drive a positive feedback effect, further intensifying warming in the region.

Warmer, wetter conditions in the Arctic are accelerating the loss of carbon stored in tundra and permafrost soils, creating a potential positive feedback that further boosts global temperatures, a Dartmouth College study finds.

The theory of dangerous climate change is based not just on carbon dioxide warming but on positive and negative feedback effects from water vapor and phenomena such as clouds and airborne aerosols from coal burning.

Another positive feedback of global warming is the albedo effect: less white summer ice means more dark open water, which absorbs more heat from the sun.

«This kind of study discusses the natural cycle and could help define the likely positive feedbacks we can expect in the long - term future, [for example] as temperatures warm, the ocean will want to give up more CO2, or rather absorb less,» says climatologist Gavin Schmidt of NASA's Goddard Institute of Space Studies.

Anyone who accepts that sunlight falling on ice free waters which has less reflectivity than sunlight falling on a large ice mass covering those waters and also accepts that this reduction in albedo has a positive feedback effect, leading to further warming, can't help but opt for A or B, it seems to me.

Methane hydrate is potentially susceptible to ocean warming, which could trigger a positive feedback resulting in rapid climate warming.

Remember that direct greenhouse effect from CO2 is quite small; the predictions rely on positive feedback from other effects (particularly water vapour feedbacks, a far more significant greenhouse gas) to cause substantial warming.

Warming oceans produced a third positive feedback cycle by pumping more moisture into the atmosphere.

Drier and warmer conditions would lead to more fires — a positive feedback loop where changes are amplified.

The direct warming effect of CO2 is relatively small, and only becomes dominant through positive feedbacks in computer models.

That is exactly the sort of situation that would be caused by having positive feedback to switch from cold to warm, and eventually a negative feedback to switch fom warm to cold.

And the more that sea ice melts, the more energy is absorbed — a positive feedback mechanism of accelerating warming and ice loss, he said.

And that additional water vapour would in turn cause further warming - this being a positive feedback, in which carbon dioxide acts as a direct regulator of temperature, and is then joined in that role by more water vapour as temperatures increase.

We humans could be pulling the trigger on that right now, and who knows when we might reach a point at which even if we cease & desist from our human emissions, the positive feedback chain of «warming causing emissions causing more warming» takes on a life of its own.

Second, and this is close to Paul Beckwith and the AMEG group (Arctic Methane Emergency Group)- Hansen doesn't factor in methane coming up in the Arctic, as a jolt to warming, and a positive feedback.

Nearly every paper that I have seen recently that has indicated a meaningful change in rate for a variable related to warming has suggested that, if anything, average model sensitivity may be too low, with positive feedbacks underestimated.

Losing reflective sea ice speeds up Arctic warming — what's known as a positive feedback.

This isn't news to top climate scientists around the world (see Hadley Center: «Catastrophic» 5 — 7 °C warming by 2100 on current emissions path) or even to top climate scientists in this country (see US Geological Survey stunner: Sea - level rise in 2100 will likely «substantially exceed» IPCC projections, SW faces «permanent drying») and certainly not to people who follow the scientific literature, like Climate Progress readers (see Study: Water - vapor feedback is «strong and positive,» so we face «warming of several degrees Celsius»).

Pick a shade that can help convey a warm sense of cheer or happiness on positive feedback.

Positive feedback from customers and fans is very encouraging to us in our day - to - day design work for the MINI brand,» explains Anders Warming, Head of MINI Design.

«Since day one, you have given us tons of positive feedback and support — the sheer volume of emails we've gotten since launch simply congratulating us for our efforts is both epic and heart warming, and I wish every developer comes to have such a fantastic community,» the studio's co-founder Marcin Iwinski said.

[1] CO2 absorbs IR, is the main GHG, human emissions are increasing its concentration in the atmosphere, raising temperatures globally; the second GHG, water vapor, exists in equilibrium with water / ice, would precipitate out if not for the CO2, so acts as a feedback; since the oceans cover so much of the planet, water is a large positive feedback; melting snow and ice as the atmosphere warms decreases albedo, another positive feedback, biased toward the poles, which gives larger polar warming than the global average; decreasing the temperature gradient from the equator to the poles is reducing the driving forces for the jetstream; the jetstream's meanders are increasing in amplitude and slowing, just like the lower Missippi River where its driving gradient decreases; the larger slower meanders increase the amplitude and duration of blocking highs, increasing drought and extreme temperatures — and 30,000 + Europeans and 5,000 plus Russians die, and the US corn crop, Russian wheat crop, and Aussie wildland fire protection fails — or extreme rainfall floods the US, France, Pakistan, Thailand (driving up prices for disk drives — hows that for unexpected adverse impacts from AGW?)

However, they can provide both positive and negative forcing» and Ray # 252 «we understand extremely well the way greenhouse gasses [sic] like CO2 warm the planet» So here we go — Assumptions from considerations of physics: Unless CO2 could enlist water vapour to amplify its forcing it would simply be an unremarkable trace gas in the atmosphere, but — CO2 + water (vapour) = + ve feedback implying warming CO2 + water (liquid) = - ve feedback implying cooling Facts: Clouds cover half the surface of the planet.

Nearly every paper that I have seen recently that has indicated a meaningful change in rate for a variable related to warming has suggested that, if anything, average model sensitivity may be too low, with positive feedbacks underestimated.

The theory suggests that the system is pushed by greenhouse gas changes and warming — as well as solar intensity and Earth orbital eccentricities - past a threshold at which stage the components start to interact chaotically in multiple and changing negative and positive feedbacks — as tremendous energies cascade through powerful subsystems.

In general, models suggest that they are a positive feedback — i.e. there is a relative increase in high clouds (which warm more than they cool) compared to low clouds (which cool more than they warm)-- but this is quite variable among models and not very well constrained from data.

Perhaps all of this newly freed up ice - cold water at the poles is temporarily acting as a negative feedback, but as it absorbs more of the solar radiation, over time, it will transform into what we rightly think: a predominately positive feedback system, rapidly intensifying the warming.

Because this issue continues to affect all coupled ocean - atmosphere models (e.g., 22 — 24), the warming (Fig. 3) represents the expression of positive biotic feedback mechanisms missing from earlier simulations of these climates obtained with prescribed PI concentrations of trace GHGs.

The known negative feedback mechanisms can reduce the warming, but they do not appear to be so strong as the positive moisture feedback.

Further research will be required to investigate if this fluctuation carries features of projected future climate change and the CO2 growth rate anomaly has been a first indicator of a developing positive feedback between climate warming and the global carbon cycle.

It appears that you believe that it would be easy to construct a model without positive feedback and no significant warming from CO2.

The water vapour theory suggests that a small increase in CO2 will result in a large positive feedback loop from water vapour and this feedback loop will lead to dangerous warming.

On the possibility of a changing cloud cover «forcing» global warming in recent times (assuming we can just ignore the CO2 physics and current literature on feedbacks, since I don't see a contradiction between an internal radiative forcing and positive feedbacks), one would have to explain a few things, like why the diurnal temperature gradient would decrease with a planet being warmed by decreased albedo... why the stratosphere should cool... why winters should warm faster than summers... essentially the same questions that come with the cosmic ray hypothesis.

What really concerns me is that I've read a lot about climate models not being able to replicate the magnitude of abrupt regional temperature changes in the past, and Raypierre has said here that he fears that past climate records point towards some yet unknown positive feedback which might amplify warming at the northern latitudes.

Positive feedback caused by rise in water vapour (caused by warming) accounts for perhaps half of the estimated warming and this will be located most where the air is humid in contradiction to Dyson's «cold and dry».

This warming will be amplified by feedbacks (assuming a net positive feedback).

Indeed, you can not get 33 degrees of warming over and above the blackbody temperature without positive feedback.

Gavin disputes that the main driver of the sea ice retreat is the albedo flip, but we are seeing not only polar amplification of global warming but positive feedback, which would not be explained simply by radiative forces and ocean currents.

Now, perhaps you can explain to us how you get 33 degrees of greenhouse warming over blackbody temperatures without significant contributions from positive feedback.