Sur­ge of ice cap Aus­t­fon­na: time lap­se video

Parts of Aus­t­fon­na, the lar­ge ice cap on Nord­aus­t­land, have recent­ly advan­ced rapidly or “sur­ged”, as sci­en­tists call this beha­viour, which is cau­sed by gla­cier dyna­mics rather than cli­ma­te chan­ge. See Aus­t­fon­na: an ice cap on the move, Spitsbergen-Svalbard.com news ear­lier in June.

The Nor­we­gi­an Polar Insti­tu­te has published a time lap­se video com­po­sed of about 1000 sin­gle satel­li­te images that visua­li­zes the sur­ge of Aus­t­fon­na impres­si­ve­ly. Parts of the gla­cier front advan­ced more than 4 kilo­me­t­res. The sur­ge cul­mi­na­ted in 2012.

More about sur­ging gla­ciers in gene­ral and Aus­t­fon­na in Rocks and Ice.

The sur­ge of an ice cap of the size of Aus­t­fon­na has con­se­quen­ces. It is curr­ent­ly by the lar­gest con­tri­bu­tor to glo­bal sea level rise in the who­le Spits­ber­gen archi­pe­la­go, with a con­tri­bu­ti­on out­weig­hing all other gla­ciers in Sval­bard tog­e­ther. Local­ly, it may cau­se hazards to navi­ga­ti­on: the den­si­ty of ice­bergs is increased, and the pushing gla­cier front may have chan­ged sea bot­tom topo­gra­phy.

Source: Nor­we­gi­sches Polar­in­sti­tut

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