Sentences with phrase «given ice albedo feedbacks»

We have more confidence in our present - day (interglacial) result since it is based on fits to direct observations rather than on more uncertain paleoreconstructions, and we find it unlikely that glacial sensitivities were much lower than 2.5 K, given ice albedo feedbacks (47, 48).

Not exact matches

[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?)

Both these factors (as well as sea ice albedo feedbacks, give the arctic region very strong positive feedback which regionally amplify the GW signal.

(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).

The exposed open water caused by the wind divergence may absorb some additional sunlight and melt more ice than usual over the next few weeks (temperature - albedo feedback)[related NASA animation], but given that the sun is well on its way to setting for the winter, I think this effect will be fairly minimal.

Ice - albedo feedback, he added, could give considerably greater warming in arctic regions.

bozzza - The differences in the Arctic are perhaps 1/4 the ocean thermal mass as global ocean averages, small overall size (the smallest ocean), being almost surrounded by land (which warms faster), more limited liquid interchanges due to bottlenecking than the Antarctic, and very importantly considerable susceptibility to positive albedo feedbacks; as less summer ice is present given current trends, solar energy absorbed by the Arctic ocean goes up very rapidly.

I explained in my essay in some detail, and several times, the ice albedo feedback effect, and gave an illustrative calculation.

If the sea level response to a change in temperature is an exponential decay to equilibrium then given that the 0.8 C temperature increase since pre-industrial times occurred over a relatively short time period relative to time scale of the ice - albedo feedback, the expected rate of sea level rise should be approximately 3 m / C * 0.8 C / 560 y = 43 cm per century.

Re # 5 As far as I understand it (drawing on my recollections of a lecture Hansen gave here at Yale a few weeks back), the actual net forcing associated with Milankovich cycles is relatively small, but it tends to trigger massive feedbacks (e.g. polar ice expanding, lowering albedo, cooling, expanding more) that «snowball» into a glacial period.