Sentences with phrase «ocean albedo feedback»

This form of ice - ocean albedo feedback proves to be a major influence on both seasonal and interannual variations in sea ice.

«This study was the first to quantitatively elucidate that ice - ocean albedo feedback is a primary driver of seasonal and yearly variations in Arctic sea ice retreat,» says Kay I. Ohshima.

Not exact matches

Sea ice reflects most of the sun's energy, he explained, whereas the open ocean absorbs more energy, and thus the disappearance of sea ice triggers even more warming, in a positive - feedback loop called albedo.

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

They got 10 pages in Science, which is a lot, but in it they cover radiation balance, 1D and 3D modelling, climate sensitivity, the main feedbacks (water vapour, lapse rate, clouds, ice - and vegetation albedo); solar and volcanic forcing; the uncertainties of aerosol forcings; and ocean heat uptake.

[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?)

Gavin disputes that the main driver of the sea ice retreat is the albedo flip, but we are seeing not only polar amplification of global warming but positive feedback, which would not be explained simply by radiative forces and ocean currents.

Because high latitudes are thought to be most sensitive to greenhouse gas forcing owing to, for example, ice - albedo feedbacks, we focus on the tropical Pacific Ocean to derive a minimum value for long - term climate sensitivity.

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.

You can substitute «CO2 from the oceans», «lower albedo», or any of the other positive feedbacks for water vapor.

Apart albedo, shouldn't we expect a classical water vapour feedback (and so DLF forcing) as arctic ice is melting and arctic seas / ocean warming?

They got 10 pages in Science, which is a lot, but in it they cover radiation balance, 1D and 3D modelling, climate sensitivity, the main feedbacks (water vapour, lapse rate, clouds, ice - and vegetation albedo); solar and volcanic forcing; the uncertainties of aerosol forcings; and ocean heat uptake.

Note extreme temperature maximums of 5 - 8 °C and that multiple ice, atmosphere and ocean processes help reinforce albedo feedbacks (after Wood et al., submitted).

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.

Is it the long - awaited, predicted and scientifically reasonable CO2 fertilization feedback effect on the oceans» vast biomass of CO2 - consuming cyanobacteria, albeit also driven by the (literally) «shit - loads» of nitrogen compounds the human race is also pumping into the oceans — thereby shifting sea surface albedos, reducing evaporation rates and troposphere relative humidities (ringing any bells here, bros)?

In addition to direct MYI melt due to high - latitude warming, the impact of enhanced upper - ocean solar heating through numerous leads in decaying Arctic ice cover and consequent ice bottom melting has resulted in an accelerated rate of sea - ice retreat via a positive ice - albedo feedback mechanism.

Based on evidence from Earth's history, we suggest here that the relevant form of climate sensitivity in the Anthropocene (e.g. from which to base future greenhouse gas (GHG) stabilization targets) is the Earth system sensitivity including fast feedbacks from changes in water vapour, natural aerosols, clouds and sea ice, slower surface albedo feedbacks from changes in continental ice sheets and vegetation, and climate — GHG feedbacks from changes in natural (land and ocean) carbon sinks.

Its warming effect, however, is simultaneously amplified and dampened by positive and negative feedbacks such as increased water vapor (the most powerful greenhouse gas), reduced albedo, which is a measure of Earth's reflectivity, changes in cloud characteristics, and CO2 exchanges with the ocean and terrestrial ecosystems.

It is notable that this feedback is arguably the most difficult to control due to the period of several decades that would be required to restore the upper oceans» natural temperature by an Albedo Restoration program lowering the surface air temperature.

So now there only remains for you to factor in the time lagged responses of isostatic adjustments, albedo feedback, ice melt and ocean heat accumulation to rapid forcing changes.

AGW climate scientists seem to ignore that while the earth's surface may be warming, our atmosphere above 10,000 ft. above MSL is a refrigerator that can take water vapor scavenged from the vast oceans on earth (which are also a formidable heat sink), lift it to cold zones in the atmosphere by convective physical processes, chill it (removing vast amounts of heat from the atmosphere) or freeze it, (removing even more vast amounts of heat from the atmosphere) drop it on land and oceans as rain, sleet or snow, moisturizing and cooling the soil, cooling the oceans and building polar ice caps and even more importantly, increasing the albedo of the earth, with a critical negative feedback determining how much of the sun's energy is reflected back into space, changing the moment of inertia of the earth by removing water mass from equatorial latitudes and transporting this water vapor mass to the poles, reducing the earth's spin axis moment of inertia and speeding up its spin rate, etc..

1 Positive 1.1 Carbon cycle feedbacks 1.1.1 Arctic methane release 1.1.1.1 Methane release from melting permafrost peat bogs 1.1.1.2 Methane release from hydrates 1.1.2 Abrupt increases in atmospheric methane 1.1.3 Decomposition 1.1.4 Peat decomposition 1.1.5 Rainforest drying 1.1.6 Forest fires 1.1.7 Desertification 1.1.8 CO2 in the oceans 1.1.9 Modelling results 1.1.9.1 Implications for climate policy 1.2 Cloud feedback 1.3 Gas release 1.4 Ice - albedo feedback 1.5 Water vapor feedback 2 Negative 2.1 Carbon cycle 2.1.1 Le Chatelier's principle 2.1.2 Chemical weathering 2.1.3 Net Primary Productivity 2.2 Lapse rate 2.3 Blackbody radiation

They have to interpret innumerable feedback loops, all the convective forces, the evaporation, the winds, the ocean currents, the changing albedo (reflectivity) of Earth's surface, on and on and on.

Analysis of summer conditions to date reveal that the melt began earlier than usual over the western and central Arctic Ocean, helping to set the stage for strong ice losses in this region during summer through the ice - albedo feedback mechanism.

In summer more sea ice melts, which leads to decreased albedo, a climate feedback that enhances the warming of both the open ocean water and the atmosphere directly above it.

My «Pope's Climate Theory» says that when you melt Arctic Sea Ice, you get Arctic Ocean Effect Snow which increases Albedo and provides negative feedback to the temperature of the earth.

Ice albedo feedback change is mainly limited to high latitude NH * land * during deglaciation, and its effects — though strong — are limited compared to those of a radiative forcing over the global ocean.

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!)

In all of these simple models, we assume the atmosphere to have a volume as fixed as a bathtub, we assume that the atmosphere / ocean system is a closed system, we assume that the incoming radiation from the Sun is constant, we assume no turbulence, we assume no viscosity, we assume radiative equilibrium with no feedback lag, we take no account of water vapor flux assuming it to be constant, no change in albedo from changes in land use, glacier lengthening and shortening, no volcanic eruptions, no feedbacks from vegetation.

Clouds are negative feedback driven nucleation points — when daytime clouds start to form the albedo causes further cooling beneath them and heat - engine thunderstorms form from the updrafts of warm wet air lofted up to the stratosphere to efficiently cool and spread, creating a local convective cell that pulls heat out of the ocean (or the moist land or air) and moves it to a cold reservoir.

Finds that the feedback for which the evidence of ongoing changes is most compelling is the surface albedo - temperature feedback, which is amplifying temperature changes over land (primarily in spring) and ocean (primarily in autumn — winter)

By relying on a GCM, Stott's analysis omits the reaction of the ocean's heat capacity, and the strong, positive and negative feedbacks of cloud albedo, two of the omissions in GCMs that also serve to negate the affirmative hypothesis.

Had they applied reasonable physical models for the integrating and lagging (low pass filtering) response of the ocean, and the positive feedback of cloud albedo from the burn off effect, they could have discovered that solar activity can account for the full, 140 - year instrumented temperature record.

The bottom line is both SW through positive albedo feedback, and LW through extra insulation, contribute to the ocean warming we have had for the past century or so.

The remaining slow drift to lower GMT and pCO2 over glacial time, punctuated by higher - frequency variability and the dust − climate feedbacks, may reflect the consequences of the growth of continental ice sheets via albedo increases (also from vegetation changes) and increased CO2 dissolution in the ocean from cooling.

Polar albedo changes, hurricanes, ocean dynamics, forest feedbacks, soil chemistry, boundary layer physics, global solar energy fluxes, cloud feedbacks, etc..

Being an ocean, the Arctic ice is a much less stable system because it is subject to positive feedback from the albedo change, while the Antarctic albedo can stay quite fixed, so it is not going to have this positive feedback.

Bottom line, the positive summer albedo feedback is much bigger when the polar area is an ocean.

This triggers a positive feedback by lowering the albedo of the ocean's surface and leading to more of the Sun's light being absorbed, amplifying the warming.

2) We have INCREASING POSITIVE feedback effects from (a) melting tundra, (b) melting melting hydrates in the oceans, (c) lower reflectivity (albedo) of the Arctic itself, not to mention its next door neighbor Greenland, (d) increased fires in northern Asia and North America which will further exacerbate albedo, (e) LESS ICE AREA to reflect sun in the Arctic... and thus allow that nice dark water to absorb more and more sun.

Thus, sea ice has melted at an unprecedented rate and is now caught in a vicious cycle known as the ice - albedo feedback: as sea ice retreats, sunshine that would have been reflected into space by the bright white ice is instead absorbed by the ocean, causing waters to warm and melt even more ice.

Perovich et al., «Increasing solar heating of the Arctic Ocean and adjacent seas, 1979 — 2005: Attribution and role in the ice - albedo feedback», GRL 2007, which says:

For example, land adjusts faster than ocean, and icy areas faster than non-icy due to extra ice - albedo feedback.