Sentences with phrase «albedo decreases with»

For instance, Han et al. (1998) showed that cloud albedo decreases with decreasing droplet size for the optically thinner clouds over the oceans.

Not exact matches

I guess I am surprised that with better understanding of the importance of water vapor feedback, sulfate aerosols, black carbon aerosols, more rapid than expected declines in sea ice and attendant decreases in albedo, effects of the deposition of soot and dust on snow and ice decreasing albedo, and a recognition of the importance of GHGs that were probably not considered 30 years ago, that the sensitivity has changed so little over time.

Unless low - level cloud albedo substantially decreased during this time period, the reduced solar absorption caused by the reported enhancement of cloud cover would have resulted in cooling of the climate system that is inconsistent with the observed temperature record.»

[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?)

That is, by decreasing the (rather high) Bond albedo of Earth one could increase rate of entropy production, which is inconsistent with a MEP state.

For example, [Kruss 1983] has this to say about the Lewis glacier on Mt. Kenya: «A decrease in the annual precipitation on the order of 150 mm in the last quarter of the 19th century, followed by a secular air temperature rise of a few tenths of a degree centigrade during the first half of the 20th century, together with associated albedo and cloudiness variation, constitute the most likely cause of the Lewis Glacier wastage during the last 100 years.»

I guess I am surprised that with better understanding of the importance of water vapor feedback, sulfate aerosols, black carbon aerosols, more rapid than expected declines in sea ice and attendant decreases in albedo, effects of the deposition of soot and dust on snow and ice decreasing albedo, and a recognition of the importance of GHGs that were probably not considered 30 years ago, that the sensitivity has changed so little over time.

What is more we know with certainty that there are significant positive feedbacks — water vapor, decreased albedo, etc..

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.

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.

So for example deglaciation warmed global mean temps by about 5 C over 10k years with a radiative forcing of about 6.5 W / m2 (total of both GHG increases and albedo decreases).

In particular, there are «slow» responses to the imbalance that are seen in the glacial record — CO2 and methane increase with a slow lag as temperature rises in response to the orbital changes, and the albedo effect that reduces incoming sunlight decreases as the ice melts, also with a slow lag.

Re 9 wili — I know of a paper suggesting, as I recall, that enhanced «backradiation» (downward radiation reaching the surface emitted by the air / clouds) contributed more to Arctic amplification specifically in the cold part of the year (just to be clear, backradiation should generally increase with any warming (aside from greenhouse feedbacks) and more so with a warming due to an increase in the greenhouse effect (including feedbacks like water vapor and, if positive, clouds, though regional changes in water vapor and clouds can go against the global trend); otherwise it was always my understanding that the albedo feedback was key (while sea ice decreases so far have been more a summer phenomenon (when it would be warmer to begin with), the heat capacity of the sea prevents much temperature response, but there is a greater build up of heat from the albedo feedback, and this is released in the cold part of the year when ice forms later or would have formed or would have been thicker; the seasonal effect of reduced winter snow cover decreasing at those latitudes which still recieve sunlight in the winter would not be so delayed).

SWR easily explains the changes when this penetrates down to 100m depth compared with 0.5 mm while cloud albedo had decreased.

With less summer snow falling and melting underway, northern Greenland's albedo, or reflectivity, also decreased.

The decrease in albedo that accompanies the loss of sea ice is the phenom that underlies «arctic amplification» (as you point out, it has nothing directly to do with sea level rise).

With regard to Dr Tobis» observation that: «there's a something on the order of a 10 % chance that we may have already passed the 2 C mark by any reasonable definition» the evidence of a study of Albedo Loss published last January appears to put the issue beyond doubt: «Observational determination of albedo decrease caused by vanishing Arctic sea ice» (Kristina Pistone, Ian Eisenman, and V. RamanAlbedo Loss published last January appears to put the issue beyond doubt: «Observational determination of albedo decrease caused by vanishing Arctic sea ice» (Kristina Pistone, Ian Eisenman, and V. Ramanalbedo decrease caused by vanishing Arctic sea ice» (Kristina Pistone, Ian Eisenman, and V. Ramanathan)

(7) A requirement that building retrofits conducted pursuant to a REEP program utilize, especially in all air - conditioned buildings, roofing materials with high solar energy reflectance, unless inappropriate due to green roof management, solar energy production, or for other reasons identified by the Administrator, in order to reduce energy consumption within the building, increase the albedo of the building's roof, and decrease the heat island effect in the area of the building, without reduction of otherwise applicable ceiling insulation standards.

The fact that the earth is still warming slightly (according to Spencer and Christy's UAH data and the «corrected» Argo data) is compatible with a decreasing albedo and incompatible with the cosmic ray hypothesis.

This is consistent with other recent work that hypothesizes that increase of melting rates of Arctic sea ice may be as much due to Chinese black carbon falling on the ice (and thereby decreasing its albedo and increasing solar heating) than from rising global temperatures.

Project Earthshine (Earthshine is the ghostly glow of the dark side of the Moon) has been measuring changes of the terrestrial albedo in relation to cloud coverage data; according to cloud coverage data available since 1983, the albedo of the Earth has decreased from 1984 to 1998, then increased up to 2004 in sync with the Mean Global Temperature.

GMT drops initially at glacial inception in response to decreased summer radiation at high northern latitudes that would have led to equatorward extension of sea ice and snow cover with associated cooling from increased albedo.

With less ice and snow reflecting the Sun's rays, melting will decrease Earth's albedo, with a predictable impact: more warmWith less ice and snow reflecting the Sun's rays, melting will decrease Earth's albedo, with a predictable impact: more warmwith a predictable impact: more warming.

Palle et al (cited elsewhere here) have shown that the total albedo has decreased over the period 1985 - 2000, while cloud cover also decreased (resulting in global warming), and has reversed itself since then, with increased cloud cover.

How much it has grown is not stated in the paper: «Observational determination of albedo decrease caused by vanishing Arctic sea ice» http://eisenman.ucsd.edu/publications/Pistone-Eisenman-Ramanathan-2014.pdf but it seems very clear that Arctic sea - ice loss is in accelerating decline towards zero in the coming decades, meaning that this forcing will rise very substantially along with those from land - ice and snow cover decline.

In the absence of absorption of terrestrial radiation by the atmosphere (and with the other caveats about still having the same albedo and such), that average temperature would have to be 255 K at the surface because of radiative balance and then the temperature would decrease with height at the lapse rate from there.

I have issues with the second tier where albedo decrease is lumped in with CO2 effects.

With conduction changes crossed off, a decrease in outward radiation would be due to a decreased albedo, where albedo represents reflection across the entire electromagnetic spectrum.

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.

At the same time the Arctic sea ice extent was decreasing with the result that the overall global albedo did not change.

With respect to Judith Curry: I will ask her to give references to better underpin her claims (for example on the claim that albedo increase on land due to more snow is compensating for the albedo decrease above the arctic sea).

The albedo or reflectivity of the ice surface is decreased by coating the surface with black particulates which don't reflect but absorb the heat from the Sun.

This study uses satellite radiation budget measurements along with satellite microwave sea ice data to document the Arctic - wide decrease in planetary albedo and its amplifying effect on the warming.

Unless low - level cloud albedo substantially decreased during this time period, the reduced solar absorption caused by the reported enhancement of cloud cover would have resulted in cooling of the climate system that is inconsistent with the observed temperature record.»

This change is explained by a decrease in subtropical and mid-latitude low cloudiness, along with a reduction in high - latitude surface albedo due to decreased sea ice.