Sentences with phrase «increased albedo caused»

Not exact matches

And by knocking down trees, which absorb sunlight, a mammoth could cause more sun to be reflected, increasing the cooling albedo effect on the permafrost.

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.

The team's computer simulations suggested that the soot can cause a decrease of between 1.6 and 4.1 percent in the glacier's albedo — a measure of its sunlight - reflecting «whiteness» — and that the resulting heating can cause up to a 24 percent increase in the annual snowmelt, Yasunari reported here Monday at a meeting of the American Geophysical Union (AGU).

Also, the reduction in forests caused by the ice's expansion increases albedo.

Ice sheet albedo forcing is estimated to have caused a global mean forcing of about — 3.2 W m — 2 (based on a range of several LGM simulations) and radiative forcing from increased atmospheric aerosols (primarily dust and vegetation) is estimated to have been about — 1 W m — 2 each.

, smoke from burning, maybe other stuff I haven't thought of yet, and there might be enough temporary albedo increase to cause short term cooling.

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).

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

(Orbital forcing doesn't have much of a global annual average forcing, and it's even concievable that the sensitivity to orbital forcing as measured in terms of global averages and the long - term response (temporal scale of ice sheet response) might be approaching infinity or even be negative (if more sunlight is directed onto an ice sheet, the global average albedo might increase, but the ice sheet would be more likely to decay, with a global average albedo feedback that causes warming).

CO2's effect of stimulating plant growth and increasing plant tolerance of aridity contributed to revegetating large areas of land that were desert at the LGM, compounding the effects of an increase in atmospheric humidity, reduced land / ocean surface ocean ration, and increased warmth, all of which combined caused the reduction of airborne dust and atmosperic albedo.

I thought polar heating was caused by GHG and albedo effects, not increased heat transport.

In the Antarctic, the increased white albedo at the surface causes the air temperature to increase on cloudy days.

It's looking more and more like most climate change can be pegged to changes in solar output, either directly through additional warming or indirectly as decreases in solar output allow more cosmic rays to reach the atmosphere, causing increased cloud nucleation and therefore increasing the earth's albedo and reflecting more solar radiation.

Ice ages come on slowly as the albedo from greater and greated snow coverage increases causing greater and greater cooling, but end rapidly as the melt back rapidly decreases the albedo.

The galactic cosmic ray issue is not just about if it may cause an increase in clouds but how it may contribute to an increase in major volcanic activity which would have major climatic due to those items effecting albedo.

It caused a bit of consternation in the 1970's when it was realized that a very small decrease in solar intensity — or an increase in albedo — is sufficient to cause a rapid transition to an icy planet in this model (2).

With a less active Sun there has been an increase in cosmic radiation, causing more low clouds, leading to an increase in the Earth's albedo, and that is reflecting away of more solar radiation.

Similarly, atmospheric aerosols, generally human - caused, can increase albedo and cool the planet — especially if they also increase cloudiness by providing condensation nuclei for WV.

I predict that we we will soon see denialist arguments of the form «yeah sure global temperatures are again rising sharply, but that is due to decreased albedo due to decreased arctic sea ice, not because increased CO2 causes global warming».

As the planet warms, increasing levels of water vapour in the atmosphere caused by higher evaporation levels form more clouds and snow increasing the albedo of the planet, reflecting heat back into space more efficiently, thus working to regulate the temperature downward.

A slight change of ocean temperature (after a delay caused by the high specific heat of water, the annual mixing of thermocline waters with deeper waters in storms) ensures that rising CO2 reduces infrared absorbing H2O vapour while slightly increasing cloud cover (thus Earth's albedo), as evidenced by the fact that the NOAA data from 1948 - 2008 shows a fall in global humidity (not the positive feedback rise presumed by NASA's models!)

This north / south asymmetry has grown since perihelion was aligned with the winter solstice seven to eight centuries ago, and must cause enhanced year - on - year springtime melting of Arctic (but not Antarctic) ice and therefore feedback warming because increasing amounts of land and open sea are denuded of high - albedo ice and snow across boreal summer and into autumn.

As I have pointed out in the «essay», what has happened (in an accelerating manner since 1246 CE) is that the insolation reaching far northern latitudes has increased during the first half of each year, and this should be anticipated to cause earlier and more - extensive spring melting of snow and ice, and therefore a progressively - earlier albedo reduction, and therefore more sunlight subsequently being absorbed across spring and summer: the ice albedo feedback effect acting positively (causing warming).

Supposedly a doubling of CO2 is supposed to produce 3.71 watts / m ^ 2 (5.35 ln (2) = 3.71) and changing the albedo from 30 % to 29 % increases the incoming solar radiatyion by 3.42 watts / m ^ 2 so this could be and is most likely the cause of observed warming.

The key point of «nuclear winter» was that increased albedo would reduce the sun's energey flux to the lower atmosphere and the earth's surface causing significant cooling.

1) In reality both the changes in albedo (reflectivity) and CO2 concentration are feedbacks on the orbital forcing, and the relation in the one direction (a change in earth's orbit causing a temperature change which in turn causes albedo and CO2 levels to change) is not necessarily the same as the relation in the reverse direction, as is currently happening with human - induced increases in CO2.

This, in turn, regionally increased albedo (caused more sunlight to be reflected from the land) and reduced evaporation, which further weakened the monsoon (Stewart, 2010).

High sensitivity is caused by increasing water vapour as the tropopause rises and diminishing low cloud cover, but the sensitivity decreases for still larger CO2 as cloud optical thickness and planetary albedo increase, as shown by Russell et al. [112].

IPCC here suggests that cloud cover increases do not cause a cloud albedo increase.

«The increased open water lowers the average albedo [reflectivity] of the planet, accelerating global warming; and we are also finding the open water causing seabed permafrost to melt, releasing large amounts of methane, a powerful greenhouse gas, to the atmosphere.»

Moreover, the loss of sea ice would have altered the planetary albedo, causing the planet to warm until clouds cover had increased enough for the radiation balance at the TOA to be restored.

The main scientific question for me, is how much does the increase in human - caused CO2 and human - caused albedo reduction increase the mean temperature above what it would be with natural cycles and processes?

This is based primarily on the huge earthshine - derived albedo increase in 2003, which the authors now admit may be caused by undersampling of the data but was the the highlight of the authors» recent Science paper (Palle et al, 2004).

What happened in the Arctic, was a slow, very slow and gradual decrease in cooling, caused by progressively longer warmer seasons, with a feedback loop of warm air reducing albedo, with reduced albedo increasing warm air.

Increases in forest cover generally cause cooling in the tropics where the ET effect dominates (Claussen et al. 2001) and warming in mid - and high - latitudes where the albedo effect is strong (Betts 2000).

The terminations were initiated by increased insolation in the NH causing ice to melt and the resulting feedbacks of albedo and GHG.

Models indicate increased boreal forest reduces the effects of snow albedo and causes regional warming.

An albedo decrease of only 1 %, bringing the Earth's albedo from 30 % to 29 %, would cause an increase in the black - body radiative equilibrium temperature of about 1 °C, a highly significant value, roughly equivalent to the direct radiative effect of a doubling of the atmospheric CO2 concentration.

1.1 C of doubled CO2 / GHG causes a feedback increase of 8 % in water vapor, a 2 % decline in cloud optical thickness and reduced Albedo as ice melts.