The paradox of the antarctic ice

… and how his resolution could thaw the sudpolar region all

2100 – or depending on the forecast also 2040 – the Nordpolarme will be freezing. The egg spanner over Gronland increases increasingly – up to 150 gigatonnes H2O other per year their state of aggregation. Alone, the sea level per year increases by up to 0.5 millimeters. The icebank must actually be at his survival outside of Zoos. A problem that does not have the inhabitants of the opposite hemisphare – not only because the penguins can swim, but also because the ice covering is not shrinking here, but increases by about 8.900 square kilometers per year (the Saarland has a ground flat of 2500 square kilometers).

That sounds Paradox – despite global climate warming, the Antarctic Sea Ice has slightly stanned in the last decades (light, because the ice surface is roughly up to 30 million square kilometers). The ocean around the Sud continent plays an important role in the global climate. He is biologically seen, the most productive of all oceans and already thereby an important valley for the Klimagas CO2.

Here are the most cold, densest water quantities that represent one of the driving force for the global debtor. The strong western winds on the Antarctic ocean drive directly the world-growing upgrade, the Antarctic circumpolar stream, which connects the Atlantic Ocean, the Pacific, the Indian Ocean and the Deep Sea.

As the obvious paradox arises, researchers are now describing in the current ie of the publications of the US Academy of Sciences (PNAs). The researchers have data from the second half of the 20. Century analyzed. Your statement: Blame is here again the climate warming. More warm = more ice? In this case, there is a system of consequences. The increased temperatures have apparently liked that the evaporation has increased in equatorial. At the same time, the rainfall rose around the Antarctic and in it.

Artistic rain instead of snow?

This was not just about crushing: the increased rainwater quantities (mostly in the form of snow) have also reduced the salt content on the surface of the sudpolarme. This resulted in a more stable layer of salt-containing water – which prevents convection of warmer deep water and thus braked the melting process. To the end of the 20. Century was also the water temperature directly below the ice layer by about 0.2 degrees lower than 1950. Snow also has an albedo that reduces the warm-up by the sea. In the sum, the ice cover grew faster than the opposite process could reduce ice.

This cycle, the researchers point out, but is unstable. In their models, it shows that he reacts chaotically to human influence. In practice, the emphasis on the climate models to 2100 predicted, among other things, drove that a rough proportion of the dependency is no longer fallen as snow, but as rain. Flue H2O has the advantage of the high albedo no longer.

In addition, the temperature of the ocean increases as a whole – the ice layer is reduced from below stronger. The researchers expect the opposite trend to reverse themselves – aming it remains in the forecast CO2 quantities in the Earth’s atmosphere. Depending on the carbon dioxide forecast, the ruckle of the Antarctic Sea ice cream is then between 4000 and 30.000 square kilometers per year. In addition, the ridge will speed up from the 2060s because of the cascading of the effects.

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