Sentences with phrase «for sea ice albedo»

Melt ponds are critical for sea ice albedo and therefore modeling the loss of sea ice with global warming in global climate models.

Not exact matches

«The unmanned SRB buoy we built made it possible for the first time to generate continuous data on albedo and other properties of sea ice over a long period,» says Dr Gerland.

Recently, however, ice - ocean «albedo feedback» has emerged as a key cause for sea ice melt.

Virtually ice - free summers in the arctic sea could well arrive by 2030, with troubling implications for accelerated albedo feedback and possibly disruptive changes in the jet stream.

This appears to show the extra snow has done little or nothing to compensate for the loss sea ice as far effective albedo is concerned.

After all the sea / ice albedo difference is large and the southern oceans are more likely to be part of an ocean mechanism for propagating the Milankovitch effect.

I had said that the main forcing for sea ice retreat was from the albedo flip.

However, Perovich et al. make the usual error in assuming the values for albedo of the ocean and sea - ice.

As for irreversible, if an ice sheet starts flowing, or if an albedo change from sea ice gets locked in, I could imagine a climate change being essentially irreversible even if CO2 was brought back down, but it's just speculation, nothing more.

On the other side of the equation, the albedo for sea - ice is likely to be too large, since the sea - ice begins to melt and form ponds, which have properties much closer to that of open water.

Here's an interesting thought for the ice experts, maybe Andy could pick this up, since he's done a very decent job of following up on my question: I've read suggestions that increased sea emissivity from the Arctic waters would gain relative to the loss of albedo from increasingly ice - free seas.

For instance, the effect of soot making snow and sea ice darker has a higher efficacy than an equivalent change in CO2 with the same forcing, mainly because there is a more important ice - albedo feedback in the soot case.

(57j) For surface + tropospheric warming in general, there is (given a cold enough start) positive surface albedo feedback, that is concentrated at higher latitudes and in some seasons (though the temperature response to reduced summer sea ice cover tends to be realized more in winter when there is more heat that must be released before ice forms).

A typo in mine at # 25 is where 40,000 m3 should read 400,000 m3, and an addendum is the reference for the forcing from the Albedo Loss feedback shown in the satellite record: «Observational determination of albedo decrease caused by vanishing Arctic sea ice» See: http://eisenman.ucsd.edu/publications/Pistone-Eisenman-Ramanathan-20Albedo Loss feedback shown in the satellite record: «Observational determination of albedo decrease caused by vanishing Arctic sea ice» See: http://eisenman.ucsd.edu/publications/Pistone-Eisenman-Ramanathan-20albedo decrease caused by vanishing Arctic sea ice» See: http://eisenman.ucsd.edu/publications/Pistone-Eisenman-Ramanathan-2014.pdf

Subject of some specific concern about global warming because of large temperature rises predicted for the arctic, and because of some arctic - specific feedback effects (e.g. the albedo feedback following loss of arctic sea ice).

Global average temperature is lower during glacial periods for two primary reasons: 1) there was only about 190 ppm CO2 in the atmosphere, and other major greenhouse gases (CH4 and N2O) were also lower 2) the earth surface was more reflective, due to the presence of lots of ice and snow on land, and lots more sea ice than today (that is, the albedo was higher).

Apart from these last concerns, the WAIS is much less worrying than the GIS, because the huge thermal inertia and albedo effect of the EAIS, the antarctic continent itself, and the large amount of antarctic sea ice in the southern winter, all act to reduce the degree of warming for the WAIS (whereas the GIS is the victim of various unfortunate circumstances which amplify warming there).

I also believe that soot and all the other aerosols that combine and rain out has contributed to significant albedo changes and is food for localized warming from biochemical activity in the boreal north that has significantly contributed to the melting of land and sea ice.

However, even a smaller figure (I had calculated about 0.17 W / m ^ 2 based on your inflated figure for total planetary albedo, but you can check it out) is still significant when compared with the total flux imbalance, which I think is a more informative comparison than an arbitrarily selected change in cloud cover, because it compares the sea ice reduction with the effects of all climate variations that have been operating in recent years..

The high reflectivity of this new planetary layer, the Lucrosphere, will radically incease our planet's albedo, and so compensate for the loss of reflective Arctic sea ice that threatens to accelerate global warming.

A simple method for estimating the global radiative forcing caused by the sea - ice - albedo feedback in the Arctic is presented.

The cryosphere derives its importance to the climate system from a variety of effects, including its high reflectivity (albedo) for solar radiation, its low thermal conductivity, its large thermal inertia, its potential for affecting ocean circulation (through exchange of freshwater and heat) and atmospheric circulation (through topographic changes), its large potential for affecting sea level (through growth and melt of land ice), and its potential for affecting greenhouse gases (through changes in permafrost)(Chapter 4).

Even with near zero CO2, and the Sun 3 - 4 % dimmer than now, the tropics require albedo help from clouds and encroaching sea ice for global freeze - 0ver — hence, an interesting science problem that needs careful cold - climate cloud and ocean dynamics modeling.

Increasing austral - spring insolation combined with sea - ice albedo feedbacks appear to be the key factors responsible for this warming.»

This study concluded that although there was a decrease in sea ice in recent years there was an increase in cloudiness that more than made up for the loss of albedo from the sea ice.

Poitou & Bréon do not explain why the ice pack volume would be relevant for the albedo; according to Haas (2005)[47] the changes of the thickness of the sea ice are small since they are correctly measured by an airborne radio apparatus, only over the Arctic.

The gains in Antarctic sea ice — the sea ice area that DOES MATTER to albedo are 25 %, 30 % and as high as 43 % GREATER than the 1980 - 2010 «average» sea ice for each day of the year.

For precisely the same core reason (apsidal precession) the opposite occurs in the southern hemisphere: less insolation at far southern latitudes, sea ice melting delayed, albedo increasing, less energy absorbed: growing sea ice: the ice albedo feedback effect acting negatively.

Hori et al.; 5.0 million square kilometers; Heuristic — remote sensing Basically, there is no change from last month except for an additional rough estimation of the arctic sea - ice albedo.

Dekker (Public), 4.60, (4.15 - 5.05 standard deviation range), Statistical Arctic sea ice decline has global implications for Northern Hemisphere weather patterns and Arctic eco systems and wild life alike, and thus it is concerning that our global climate models so far appear to underestimate the observed rate of decline based on albedo amplification of sea ice alone.

The amount of sea ice is rather sensitive to climate change: meltwater ponding, for instance, dramatically increases the albedo of sea ice, leading to enhanced ice melt.

Based on the understanding of both the physical processes that control key climate feedbacks (see Section 8.6.3), and also the origin of inter-model differences in the simulation of feedbacks (see Section 8.6.2), the following climate characteristics appear to be particularly important: (i) for the water vapour and lapse rate feedbacks, the response of upper - tropospheric RH and lapse rate to interannual or decadal changes in climate; (ii) for cloud feedbacks, the response of boundary - layer clouds and anvil clouds to a change in surface or atmospheric conditions and the change in cloud radiative properties associated with a change in extratropical synoptic weather systems; (iii) for snow albedo feedbacks, the relationship between surface air temperature and snow melt over northern land areas during spring and (iv) for sea ice feedbacks, the simulation of sea ice thickness.

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.

Seems to me David's mistake is not noticing that the rapid events are internal to the climate system, not external; they may cause fast changes in albedo for example for a while; and they are modeled, see Dr. Bitz's work on Arctic sea ice, or any model including volcanos or Atlantic deep water currents etc..

When the Arctic sea ice suddenly disppears the climate will warm until it settles into a new state where there is increased cloud to compensate for the loss of albedo from the sea ice.

The NCAR Community Climate System model 20th century simulations for CMIP5 (Gent et al. 2011) arguably qualifies as a completely forward calculation, with forcing data sets being selected a priori and no tuning of parameters to the 20th century climate other than the sea ice albedo and the low cloud relative humidity threshold.

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