Animació feta per la Nasa de l’evolució del gel de l’Àrtic els últims 30 anys

Una nova animació de la NASA mostra el moviment del gel marí de l’Àrtic, la gran massa d’aigua congelada en l’Oceà Àrtic, en una impressionant  lapse de temps que abasta tres dècades.

El gel de l’Àrtic s’està reduint, i a mesura que perd massa, es fa més en risc d’escalfament de les aigües i l’atmosfera.

El que hem vist en els últims anys és que el gel més antic està desapareixent,” va dir Walt Meier, investigador de la mar de gel al Centre de Vol Espacial Goddard de la NASA a Greenbelt, Maryland, 

L’animació  també mostra com la massa de gel es mou al llarg de les estacions i els anys. En el vídeo, el gel més jove es mostra un to més fosc, mentre que el gel més antic és de color blanc. El gel més antic també s’està reduint.

Els científics de la Universitat de Colorado va tenir una manera de controlar el moviment del gel marí a l’Àrtic i l’edat utilitzant instruments dels satèl·lits, el temps i les dades de les boies.Els instruments detecten la ‘temperatura de brillantor’ que prové de la lectura de la temperatura, la textura, la salinitat i la quantitat de neu a la part superior del gel.

https://www.rt.com/viral/364708-arctic-ice-shrinks-timelapse/

A new animation from NASA shows the movement of Arctic sea ice, the large mass of frozen water on the Arctic Ocean, in a stunning time-lapse spanning three decades.

The Arctic sea ice is shrinking, and as it loses mass, it becomes more at risk from warming waters and atmosphere.

“What we’ve seen over the years is that the older ice is disappearing,” Walt Meier, sea ice researcher at NASA’s Goddard Space Flight Center in Greenbelt, Maryland, said.

“This older, thicker ice is like the bulwark of sea ice: a warm summer will melt all the young, thin ice away but it can’t completely get rid of the older ice. But this older ice is becoming weaker because there’s less of it and the remaining old ice is more broken up and thinner, so that bulwark is not as good as it used to be.”

NASA’s Scientific Visualization Studio has created a visual impression of just how much the Arctic sea ice has reduced since 1984.

In 1984, there was 1.8 million sq km of ice that was at least five years old at its lowest annual amount. By September 2016, there was a mere 110,000 sq km left.

The time-lapse animation also shows how the mass of ice moves around throughout the seasons and years. While the surface area of the sea ice has been shrinking, the older ice is also being reduced, making the entire ice block less sturdy due to the younger ice’s thinness.

In the video, the younger ice is shown a darker shade, while the older ice is white.

Scientists at the University of Colorado came up with a way to monitor Arctic sea ice movement and age using satellite passive microwave instruments, weather and data from buoys.

The instruments detect ‘brightness temperature’ which comes from reading temperature, texture, salinity and the amount of snow on top of the ice.

“It’s like bookkeeping; we’re keeping track of sea ice as it moves around, up until it melts in place or leaves the Arctic,” said Meier.

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