Sentences with phrase «current changes in sea ice»

Not exact matches

«It will help us to find clearer answers as to whether the Arctic sea ice melts primarily due to higher temperatures or whether the sea ice is shrinking due to changes in wind and ocean currents.»

But changes in sea level and ocean currents in the ice - covered regions of the Arctic and Antarctic in particular are very difficult to detect.

Current estimates of sea - level rise by the Intergovernmental Panel on Climate Change consider only the effect of melting ice sheets, thermal expansion and anthropogenic intervention in water storage on land.

It could be a change in algae or other food for them, or it could be that sea ice provides shelter from predators, or affects the currents in some way.

That is a major change in sea currents, warming, wildlife, coastal erosion, and much less solar energy being bounced back into space by ice that in not there.

Current changes in the ocean around Antarctica are disturbingly close to conditions 14,000 years ago that new research shows may have led to the rapid melting of Antarctic ice and an abrupt 3 - 4 metre rise in global sea level.

This could be do to changes in ocean circulation, and warming waters reaching the grounding lines for ice shelves in Arctic and Antarctica, leading to non-linear increase in melting and sea level rise, impossible to avoid on our current path.

[44] Factors limiting or threatening current population levels include ship strikes, entanglement in fishing gear, and changes in sea - ice coverage associated with climate change.

Other factors would include: — albedo shifts (both from ice > water, and from increased biological activity, and from edge melt revealing more land, and from more old dust coming to the surface...); — direct effect of CO2 on ice (the former weakens the latter); — increasing, and increasingly warm, rain fall on ice; — «stuck» weather systems bringing more and more warm tropical air ever further toward the poles; — melting of sea ice shelf increasing mobility of glaciers; — sea water getting under parts of the ice sheets where the base is below sea level; — melt water lubricating the ice sheet base; — changes in ocean currents -LRB-?)

More ground turns from white reflective snow to black, heat absorbant dirt.The same effect occurs as sea ice is lost.The corals blanch, and, as I stated last year on this site, the shutdown of the north Atlantic current will occur, since the salinity level studies I spoke of last year, off Greenland, continue to show that the upwelling mechanisms driving the North Atlanic current are in severe jeapordy, because the change in salinity levels effects the driver of the current, the upwelling and downwelling of different salinity levels off Greenland.

If our ice sheets are going to change our sea level that much, from its current rate of melt, the melt rate would have to increase exponentially in the future.

So how much do changes in the Arctic atmosphere play a role in the loss of sea - ice volume and the apparent failure of the GCMs to reflect the current volume loss?

How would this change in currents affect the amount of heat in the surface layer that is transported into the Arctic and contributes to melting the Arctic Sea Ice?

your evidence for Arctic ice concentration similar in extent or lower than current is 1) your personal experience 2) a 1952 ecyclopedia entry describing changing sea ice cover for one region of the Arctic.

Changes in SST distribution is what one gets from starting / stopping North Atlantic Current components in Labrador and Greenland Seas, capping with sea ice, etc. 4.

Research indicates that the Arctic had substantially less sea ice during this period compared to present Current desert regions of Central Asia were extensively forested due to higher rainfall, and the warm temperate forest belts in China and Japan were extended northwards West African sediments additionally record the «African Humid Period», an interval between 16,000 and 6,000 years ago when Africa was much wetter due to a strengthening of the African monsoon While there do not appear to have been significant temperature changes at most low latitude sites, other climate changes have been reported.

It appears that Antarctic sea ice changes in steps and that the current period is one of relative stability.

Shifting currents, increased freshwater input from melting sea ice and glaciers, and changes in upper and lower sea - level circulation patterns are already occurring, and they'll progress rapidly if anthropogenic greenhouse gas emission continues under a business - as - usual scenario.

It could take decades or centuries, but change will be locked in by a 3C temperature rise, which would extensively melt ice caps, shrink glaciers and thermally expand the oceans so many current coastlines and low - lying plains would be under sea level.

Polyak et al. (2010) looked at Arctic sea ice changes throughout geologic history and noted that the current rate of loss appears to be more rapid than natural variability can account for in the historical record.

They explain how, overall, Antarctic sea ice cover (frozen sea surface), for separate reasons involving wind changing in relation to the location of certain warming sea water currents, shows a slight upward trend, though it also shows significant melting in some areas.

Now for sea ice, this type of ice is influenced by year - to - year changes in wind directions and changes in ocean currents.

Session speakers guided audience members through current research efforts to understand the Arctic's role in the global weather system, to predict changing sea ice patterns, and to perceive both the global and local implications of thawing permafrost and shifting hydrology patterns in the Arctic's terrestrial cryosphere.

The group found that the icy winds blowing off Antarctica, as well as a powerful ocean current that circles the frozen continent, are much larger factors in the formation and persistence of Antarctic sea ice than changes in temperature.

We believe a much simpler explanation is that the changes in the Arctic sea ice are not due to the «man - made global warming» assumed by current climate models.

The geochemist Wallace Broecker, to whom we owe a number of the important ideas about abrupt climate change, speculates that there is a chain of causation starting with more far - northern winter sea ice and (because of the ice preventing the winds from stirring up waves and evaporation and salt excess) thereby fewer sinks for the Gulf Stream, which in turn diminishes the big conveyor loop of currents linking the North Atlantic to the Pacific.

This Section places particular emphasis on current knowledge of past changes in key climate variables: temperature, precipitation and atmospheric moisture, snow cover, extent of land and sea ice, sea level, patterns in atmospheric and oceanic circulation, extreme weather and climate events, and overall features of the climate variability.

Over the past fifty million years, earth cooled because land moved, ocean currents changed, more and more warm water was circulated in higher Latitudes and Polar Oceans to melt more and more sea ice to support more and more snowfall to promote more and more ice on land.

This report discusses our current understanding of the mechanisms that link declines in Arctic sea ice cover, loss of high - latitude snow cover, changes in Arctic - region energy fluxes, atmospheric circulation patterns, and the occurrence of extreme weather events; possible implications of more severe loss of summer Arctic sea ice upon weather patterns at lower latitudes; major gaps in our understanding, and observational and / or modeling efforts that are needed to fill those gaps; and current opportunities and limitations for using Arctic sea ice predictions to assess the risk of temperature / precipitation anomalies and extreme weather events over northern continents.

With these trends in ice cover and sea level only expected to continue and likely worsen if atmospheric carbon dioxide levels continue to rise, they could alter the stresses and forces fighting for balance in the ground under our feet — changes that are well - documented in studies of past climate change, but which are just beginning to be studied as possible consequences of the current state of global warming.

Thirteen years of GRACE data provide an excellent picture of the current mass changes of Greenland and Antarctica, with mass loss in the GRACE period 2002 - 15 amounting to 265 ± 25 GT / yr for Greenland (including peripheral ice caps), and 95 ± 50 GT / year for Antarctica, corresponding to 0.72 mm / year and 0.26 mm / year average global sea level change.

Just for one example, if it turns out that, between melt of sea ice and Greenland ice, the North Atlantic Current slows or stops, we would expect to see fairly dramatically colder weather in Europe for a while, even thought this condition could be directly linked to results produced by GW (though in the long term, the warming would, presumably eventually overtake the cooling from change in ocean currents).

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..

Arctic Currents Weaken or Stop With Double CO2 Levels What they found was that under a business as usual scenario, with CO2 levels doubling by 2070, the Transpolar Drift stops and other Arctic currents weaken due to, among other factors, melting of sea ice and changed wind patterns in a warmeCurrents Weaken or Stop With Double CO2 Levels What they found was that under a business as usual scenario, with CO2 levels doubling by 2070, the Transpolar Drift stops and other Arctic currents weaken due to, among other factors, melting of sea ice and changed wind patterns in a warmecurrents weaken due to, among other factors, melting of sea ice and changed wind patterns in a warmer world.

Uncertainties should decrease closer to near - current dates (e.g. from denser and more accurate sampling)-- but note that these products also employ different QC and analysis methods, rely to varying degrees on satellite data, on sea - ice data to constrain polar SST, and on bias adjustments for historical changes in measurement methods.