Sentences with phrase «increased albedo due»

With regard to his «other hypotheses, predict the opposite» he may be referring to increased albedo due to the expectation that increased global warming increases snowfall in the northern and southern latitudes; or the shutdown of the thermohaline circulation of the ocean.

Most of the GMT drop has been attributed to radiative forcing decreases from increased albedo due to equatorward ice extension and from decreased greenhouse gas concentrations; vegetation and atmospheric dust are thought to play secondary roles (20, 21).

Not exact matches

The reduction of surface reflection due to biological activity, derived from our results, was used as a proxy for a reduction in albedo in the regional climate model Modèle Atmosphérique Régional (MAR; Fettweis et al., 2013) to project future microbially - mediated increases in GrIS melt (see Methodology, Supplementary Information).

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.

However, simulations using the relatively straightforward «direct effect» of aerosols (the increase in albedo of the planet due to the particle brightness) do not match the inferred changes.

Claquin et al's model - derived findings show a change in tropical atmospheric forcing of «-- 2.2 to — 3.2 W m — 2» between PI and LGM earth, due to the increased albedo of atmospheric dust.

Global climate models have successfully predicted the rise in temperature as greenhouse gases increased, the cooling of the stratosphere as the troposphere warmed, polar amplification due the ice - albedo effect and other effects, greater increase in nighttime than in daytime temperatures, and the magnitude and duration of the cooling from the eruption of Mount Pinatubo.

Suppose that there has been a multi-century increase in the poleward heat transport in the oceans due to internal variability, which warms the poles, reduces ice extent and albedos, and thereby warms the planet.

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).

If CO2 in the Anthropocene atmosphere contributes to re-vegetating currently arid areas as it did post-LGM, we should expect an even greater warming feedback from CO2 than is assumed from water vapor and albedo feedbacks, due to decreased global dust - induced albedo and increased water vapor from transpiration over increased vegetated area.

The rise of CO2 from 270ppm to now over 400ppm, the extent of equatorial and sub tropical deforestation, the soot deposits on the polar ice caps, the increase in atmospheric water vapour due to a corresponding increase in ocean temps and changes in ocean currents, the extreme ice albedo currently happening in the arctic etc, etc are all conspiring in tandem to alter the climate as we know it.

First, it appears no one has a good handle on how much convection is increasing, therefore realistically on how much albedo is increasing due to it.

In the real world the most obvious and most common reason for an increase in the speed of energy flow through the system occurs naturally when the oceans are in warm surface mode and solar input to the oceans due to reduced global albedo is high as apparently occurred during the period 1975 to 1998.

Forcing from surface albedo changes due to land use change is expected to be negative globally (Sections 2.5.3, 7.3.3 and 9.3.3.3) although tropical deforestation could increase evaporation and warm the climate (Section 2.5.5), counteracting cooling from albedo change.

When the flux is increased, the planet undergoes a decrease in surface albedo which is due to the melting of the permanent polar ice caps and the reduced seasonal snow cover.

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.

One of the most puzzling things is that the heating between 1980 and 2000 seems to have been driven by a large increase in net received shortwave radiation due to albedo reduction, rather than by any observed reduction in outgoing longwave radiation.

16) The main cloud bands move more equatorward to regions where insolation is more intense and total global albedo increases once more due to longer lines of air mass mixing.

(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.

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.

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».

(Note, however, that to the extent that positive cloud feedbacks on GHG - mediated forcing mediate a reduction in cloud cover, the amplification will substitute some SW effects for LW effects due to the reduced cloud greenhouse warming and increased warming from a lower albedo).

In my experience that's usually the biggest variable, but there could be many reasons for your results to vary — puddling resulting in increased splashing on one side or another, snow removal activities or pavement salting that occurred unbeknownst to you, albedo alterations due to dirt that preferentially affect one area more than another, and so on.

His answer to that problem is found in changes in seasonal albedo due to the increased seasonal insolation.

This radiative response by the system is due predominantly to increased thermal radiation, but it is modified by climate feedbacks such as changes in water vapour, clouds and surface albedo, which affect both outgoing longwave and reflected shortwave radiation.

Furthermore, since clouds only account for about 0.2 of that 0.3 albedo, it would take about a 5 % increase in the current albedo due to clouds in order to cancel.

And, even this number is in some sense deceiving because increasing clouds actually has two effects: a cooling effect due to the increase in albedo and a warming effect due to a decrease in the outgoing IR («longwave») radiation.

The overall effect of the cloudiness on the earth is a cooling effect but there is enough warming due to the decrease in outgoing IR radiation that it offset a considerable fraction of the cooling effect due to the increase in albedo alone.

At the same time the albedo of earth will be on the increase due to more low clouds, ice and snow cover.

Lately global albedo has seemed to be increasing, possibly due to regional aerosol issues.

Land cover changes, largely due to net deforestation, have increased the surface albedo giving an RF of — 0.2 [± 0.2] W m — 2, with a medium - low level of scientific understanding.

In order of seniority, the seven feedbacks that seem outstanding are: Water vapour — rising by ~ 7 % per 1.0 C of warming; Albedo loss — due mostly to cryosphere decline; Microbial peat - bog decay — due to rising CO2 affecting ecological dynamics; Desiccation of tropical and temperate soils — due to SAT rise and droughts; Permafrost melt — due to SAT rise plus loss of snow cover, etc; Forest combustion — due to SAT rise, droughts, pest responses, etc; Methyl clathrates [aka methane hydrates] now threatened by rising sea - temperatures, increased water column mixing, etc..

Greenhouse warming that is stronger over land and in the Northern Hemisphere tends to strengthen the monsoon, but increases in planetary albedo over the continent due to aerosol forcing and / or land - use change tend to weaken it.

I can think of a number of reasons why measured Ocean Heat content may be increasing or seem to be increasing even when albedo due to clouds increases reducing the amount of heat to the surface.

If the initial direct forcing due to orbit change is «negligible», and the feedback mechanisms (GHG increase and albedo change) «fully account for» the temperature rise, then we should see an acceleration of temperature rise as these feedbacks kick in.

Some interesting questions arise — how will expected AGW changes such as increases in weather extremes interact with agriculture to amplify or diminish warming — are albedo changes due to agriculture warming or masking, and how will that change with floods or drought?

Putting the two formulas together, a theoretical additional factor of 2.06 multiplier due to the greenhouse effect becomes an actual multiplier of 0.226, thanks to negative factors like increases in albedo due to clouds, decreases in lapse rate, etc..

And if this type of albedo were to decrease, would that decrease outweigh albedo increases, say, due to clouds or other factors?

Carter et al. [1] do not appear to be aware that temperature buffering effects due to high evaporative rates in the tropics and tropical islands, loss of ice albedo in the poles, and other factors, result in that global temperature increases rise rapidly with higher latitude [4],

Since climate change is expected to make subtropical regions drier, desertification is expected to further increase, especially due to bidirectional albedo — vegetation feedback [22].

It is logical to presume that changes in Earth's albedo are due to increases and decreases in low cloud cover, which in turn is related to the climate change that we have observed during the 20th Century, including the present global cooling.

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).

As I read for example Bony et al. 2006, Soden and Held 2006, there are in the IPCC dogma four «feedbacks»: increased atmospheric optical thickness due to increased water vapour column amount due to sustained relative humidity; cloud radiative effects; albedo effects; lapse rate effects.

These runs are examined for evidence of accelerated climate change associated with the removal of sea ice, particularly due to increasing surface albedo feedback.