Sentences with phrase «albedo warming»

Just go back to your hole until you and your hippie friends crank out the numbers on particulate albedo warming; ^) I want my free ice cream and I want it now.

black soot has also been found by a recent university of california study to be the direct cause of the albedo warming effect on the otherwise highly reflective and pristine white arctic ice & snow.

Not exact matches

Whereas carbon levels can affect warming on a global scale, the effects of increased albedo and poor evotranspiration would affect temperatures only on a regional level.

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.

«This albedo feedback could result in the same amount of warming as a doubling of [carbon dioxide],» Henry says.

«As warming continues, the feedback from declining albedo will add up,» Tedesco said.

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.

Critics argue that albedo modification and other «geoengineering» schemes are risky and would discourage nations from trying to reduce their emissions of carbon dioxide, the heat - trapping gas that comes from the burning of fossil fuels and that is causing global warming by absorbing increasing amounts of energy from sunlight.

Albedo modification «is not a solution to global warming, it is only a way to avoid, perhaps, a tipping point in the climate.»

Keith adds, however, that the few existing studies suggest albedo modification could help ameliorate some effects of global warming.

«If you can time your emissions so they have the least impact then you will not trigger these very sensitive regions to start warming by this ice albedo feedback process.»

Other research signals that the albedo effect «causes so much warming that permafrost thaws even despite the cooling from shrubs,» he said.

While plants also absorb carbon from the air, the team found that the warming power of water vapor and the albedo effect in particular far outweigh this cooling factor.

He predicts an acceleration of warming trends to take place in coming decades but what that means for cloud formation, hydrological cycles and other events that affect albedo is unknown.

Thawing permafrost, methane time bombs in the Arctic, rapidly melting ice from the North Pole to Greenland impacting albedo, sparking more warming.

If this change in global albedo is what is causing global warming, how did the process get started?

They tend to believe that as the planet warms, low - level cloud cover will increase, thus increasing planetary albedo (overall reflectiveness of the Earth), offsetting the increased greenhouse effect and preventing a dangerous level of global warming from occurring.

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.

Lynn, the increase of temperatures in the Arctic, is mainly the result of an inflow of warmer air from lower latitudes (with the current AO) and the change in albedo (mainly in summer).

We talk through some of the most pressing issues in modern climate science: our chances of staying below 1.5 °C of warming without climate engineering, climate engineering with land - based albedo modifications, and the kinds of societal transformations needed for radical mitigation.

Scientists say increasing the planet's albedo by 1 percent — by painting roads and roof tops white — might be enough to halt global warming.

This chemical weathering process is too slow to damp out shorter - term fluctuations, and there are some complexities — glaciation can enhance the mechanical erosion that provides surface area for chemical weathering (some of which may be realized after a time delay — ie when the subsequent warming occurs — dramatically snow in a Snowball Earth scenario, where the frigid conditions essentially shut down all chemical weathering, allowing CO2 to build up to the point where it thaws the equatorial region, at which point runaway albedo feedback drives the Earth into a carbonic acid sauna, which ends via rapid carbonate rock formation), while lower sea level may increase the oxidation of organic C in sediments but also provide more land surface for erosion... etc..

The factors that determine this asymmetry are various, involving ice albedo feedbacks, cloud feedbacks and other atmospheric processes, e.g., water vapor content increases approximately exponentially with temperature (Clausius - Clapeyron equation) so that the water vapor feedback gets stronger the warmer it is.

How many other opposing feed backs are there - albedo from frozen and liquid precipitation, CO2 fertilization and possible desertification from global warming, and the many others.

I imagine the CO2 feedback would be more important as a feedback to any albedo changes brought by warming.

As I understand Hansen he's saying: if we double CO2 this century (so upto about 550 - 600 ppm), that will mean a forcing of about 4 W / m2 and 3 degrees C warming in the short term (decades), and thru slow feedbacks (albedo + GHG) another 4 W / m2 and 3 degrees in the long term (centuries / millennia).

As ice melts and ice area decreases, the albedo feedback will amplify global warming.

However, I had to wear my white dress, because it's perfect for being outside in the heat (white increases your albedo, and a higher albedo means more sunlight reflected off of you, so you don't feel as warm!).

A journalist from Jyllands Posten present at the conference got the message, as my criticism was echoed in a news report the following day («Klimaforskere i åben krig» [translation «Climate researchers in open war»], May 28, 2002): It's tricky to explain how a warming caused by decreasing albedo would be stronger at the night - side (dark) of the planet.

[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, the Management and Guest Contributors at WUWT accept the basic truth that CO2, water vapor, and other «greenhouse gases» are responsible for an ~ 33ºC boost in mean Earth temperature, that CO2 levels are rising, partly due to our use of fossil fuels, that land use has changed Earth's albedo, and that this human actvity has caused additional warming.

I would expect the albedo effect presented by clouds to be weak over the mostly snow / ice covered Antarctica, but Svensmark argues that the clouds here warm rather than cool the temperature.

The resulting decrease in albedo then warms the atmosphere.

Other factors would include: — albedo shifts (both from ice > water, and from increased biological activity, and from edge melt revealing more land, and from more old dust coming to the surface...); — direct effect of CO2 on ice (the former weakens the latter); — increasing, and increasingly warm, rain fall on ice; — «stuck» weather systems bringing more and more warm tropical air ever further toward the poles; — melting of sea ice shelf increasing mobility of glaciers; — sea water getting under parts of the ice sheets where the base is below sea level; — melt water lubricating the ice sheet base; — changes in ocean currents -LRB-?)

Increased CO2 does not warm the atmosphere, it melts the snow and ice reducing global albedo, and that causes AGW.

According to the skeptics, the solar irradiance isn't very important, it is the strength of the sun's magnetic field (that allows or stops cosmic rays from coming in which then causes more or less clouds, which increases or decreases the Earth's albedo, which then causes warming or cooling of the Earth's surface).

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.

He predicts an acceleration of warming trends to take place in coming decades but what that means for cloud formation, hydrological cycles and other events that affect albedo is unknown.

So, clouds both warm and cool, and their overall effect upon climate depends upon the balance between albedo cooling and greenhouse warming.

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.

28, Alastair McDonald: Increased CO2 does not warm the atmosphere, it melts the snow and ice reducing global albedo, and that causes AGW.

This would mean that overall the albedo forcing would double, and the rate of Arctic warming would suddenly double.

Referring to a 2004 paper examining the impact of soot on albedo, Goddard fabricates a conclusion by Hansen: «In 2004, Dr Hansen... explained that most of Arctic warming and melting is due to dirty snow from soot, not CO2.»

And the ice does play the major part once the trigger is pulled — more / less - ice >> more / less - albedo >> less / more - solar - warming >> cooler / warmer - climate >> more / less - ice.

For instance, increasing cloud cover due to global warming may change the albedo, but this would be a feedback to a larger warming effect, rather than a cooling.

In the NH a lot of land surrounding the arctic ocean is subject to the combination of decrease in seasonal snow cover (with climate warming), and decreasing albedo due to vegetation feedbacks.

But this scenario was created with models that may underestimate warming because they underestimate feedbacks, such as sea - ice albedo.

Increasing the negative feedback, as might happen in the atmosphere if global warming creates increased cloud cover (hence albedo), can increase the amplitude of the oscillations.

The bottom line is that uncertainties in the physics of aerosol effects (warming from black carbon, cooling from sulphates and nitrates, indirect effects on clouds, indirect effects on snow and ice albedo) and in the historical distributions, are really large (as acknowledged above).

• albedo decreases as ice melts (ice is perhaps 80 % reflective, while ocean albedo can be as low as 3.5 %) • increased water vapor in a warmer climate • warmer oceans absorb less carbon dioxide • warmer soils release carbon dioxide and methane • plants in a hotter climate are darker