Sentences with phrase «positive feedback effects»

To achieve critical mass, a multi-sided platform uses both pricing and design choices, and, without critical mass on all sides, the positive feedback effects that enable the platform's unique matching abilities might not be achieved.

But, they say that warming is likely to be mild unless you use a model which assumes large positive feedback effects.»

All those positive feedback effects are working against the Arctic and there is no reason to think they will back off in any significant way over the next several years.

2) We have INCREASING POSITIVE feedback effects from (a) melting tundra, (b) melting melting hydrates in the oceans, (c) lower reflectivity (albedo) of the Arctic itself, not to mention its next door neighbor Greenland, (d) increased fires in northern Asia and North America which will further exacerbate albedo, (e) LESS ICE AREA to reflect sun in the Arctic... and thus allow that nice dark water to absorb more and more sun.

I think legs 1 and 3 could be reasonably demonstrated (although leg 3 requires a little bit of hand waving about the positive feedback effects).

Publications by James E. Hansen pubs.giss.nasa.gov, his latest book is: Storms of My Grandchildren: The Truth About the Coming Climate Catastrophe and Our Last Chance to Save Humanity. Amazon.com Runaway climate change Runaway climate change describes a scenario in which the climate system passes a threshold or tipping point, after which internal positive feedback effects cause the climate to continue changing, even...

Most of the warming in climate models is not from CO2 directly but from feedback effects, and the evidence for strong positive climate feedback on temperature is very weak (to the point of non-existence) as compared to the evidence of greenhouse gas warming (yes, individual effects like ice cover melting are undeniably positive feedback effects, the question is as to the net impact of all such effects).

Or is the Earth's climate an exception to most other physical processes, is it in fact dominated by positive feedback effects that, like the sudden acceleration in grandma's car, apparently rockets the car forward into the house with only the lightest tap of the accelerator?

However, once temperature starts rising, there are other positive feedback effects.

-LSB-...] build in hypothetical positive feedback effects in order to generate greater temperature impacts.

This is a second theory, that the Earth's temperature system is dominated by very strong net positive feedback effects.

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

Thereby you get a positive feedback effect where the ice sheet absorbs even more solar radiation producing yet more melt.»

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

Once we got smart enough to develop tools and find a richer diet, a positive feedback effect may have kicked in, leading to further brain expansion.

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.

The point is: it's widely recognized that CO2 levels in the atmosphere increase as a result of temperature increases, a positive feedback effect.

For starters, one simply can not equate the positive feedback effect of melting ice (both reduced albedo and increased water vapor) from that of leaving maximum ice to that of minimum ice where the climate is now (and is during every interglacial period).

This combined with positive feedback effect from melting of a huge amount surface ice was enough to cause the 5 - 6C rise.

As the surface and atmosphere warm, the model atmosphere becomes moister, which in turn causes more warming - a positive feedback effect.

I already incorporated the weak positive feedback effect that CO2 would have in this model: http://theoilconundrum.blogspot.ch/2012/03/co2-outgassing-model.html

Re: The Single Most Important Point: yes, the ASSUMED positive feedback effect is DOUBLE the effect of CO2 alone, giving rise to a predicted warming 3 times that due to CO2 alone.

«We build on this insight to demonstrate directly from ice - core data that, over glacial — interglacial timescales, climate dynamics are largely driven by internal Earth system mechanisms, including a marked positive feedback effect from temperature variability on greenhouse - gas concentrations.»

The fact that is being overlooked is that the main positive feedback effect is thought to be, «more water vapour gives more temperature which gives more water vapour».

The forcing is really a net albedo forcing from the varying ice extent, and the albedo has a positive feedback effect both on itself and with CO2 / H2O as the earth cools into an Ice Age.

It only becomes significant in the models by assuming that water vapor concentration increases in response to the slight warming produced by CO2 increases and therefore constitutes a powerful positive feedback effect which triples the effect of CO2 by itself.

As I've demonstrated, some warming has to be attributed to the positive feedback effect of water vapour, however, you are right in saying that the trigger for past warming was (almost always) solar activity (or Milankovitch cycles).

In this article I present prima facie evidence that the ongoing natural increase in spring insolation occurring at high northern latitudes, coupled with the positive feedback effect of the resultant snow and ice loss reducing the region's mean albedo over summer, comprises just such a causative agency.

Some skeptics ask, «If global warming has a positive feedback effect, then why don't we have runaway warming?

There might be a slight positive feedback effect, but it's much less than other factors.

Once an ice sheet starts to melt, the surface of the ice gradually decreases in altitude and becomes warmer, leading to yet more melting in a positive feedback effect.

GH effect of CO2 is no more than 1 C. All other significant global warming is said to be from some positive feedback effect.

In this article, I provide a diagnosis and prescription for the IPCC: paradigm paralysis, caused by motivated reasoning, oversimplification, and consensus seeking; worsened and made permanent by a vicious positive feedback effect at the climate science - policy interface.

And then of course, would the low level clouds be a negative or positive feedback effect on outbound LWIR.

-- GHGs can work both as forcing and as feedback, the notion is clear, also that water vapour is a positive feedback effect — When water warms the amount of water vapour will increase, as will C02

Not exact matches

And since Amazon does rank its employees, the Anytime Feedback Tool is more than just a way to gossip about your coworkers — it could have a real effect on your standing at the company, though an Amazon spokesperson told The Times that feedback generally tends to be pFeedback Tool is more than just a way to gossip about your coworkers — it could have a real effect on your standing at the company, though an Amazon spokesperson told The Times that feedback generally tends to be pfeedback generally tends to be positive.

Positive economic feedback effects from a somewhat faster growing economy seem likely to shrink the tax bill's deficit impact relative to the «static scoring» estimate of about $ 1.5 trillion.

This all exists in a weird positive feedback loop where the longer rates are low, the less effect the low interest rates have.

This is not the only such «positive feedback» effect.

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.

And the positive effects of this program are obvious in the feedback received from past and present participants.

It illustrates the interplay effect of positive and negative feedbacks.

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.

The effect of these small orbital changes was amplified by positive feedbacks, such as changes in greenhouse gas levels.

This positive feedback phenomenon, called the runaway albedo effect, would eventually lead to a single dominating ice cap, like the one observed on Pluto.

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.

First that CO2 is the main climate driver, second that in calculating climate sensitivity the GHE due to water vapour should be added to that of CO2 as a feed back effect and third that the GHE of water vapour is always positive.As to the last point the feedbacks can not be positive otherwise we wouldn't be here to talk about it.

Answer: because in (6) according to the black - body approximation positive feedbacks due to the greenhouse gas effects do not exist.

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.

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