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Arktički sumpor

Slojevi smeđeg sumpora vidljivi iznad horizonta. Ovaj fenomen pojavljuje se u pravilu u proljeće u područjima visokih geografskih širina (iznad 70˚N). Rezultat je transporta kapljica prouzrokovanih vulkanima, pješčanim olujama i antropogenim onečišćenjem izvan Arktika – većinom iz Europe, Azije i Sjeverne Amerike. Za razliku od običnog smoga u nižim geografskim širinama, arktički sumpor traje mnogo dulje, do nekoliko tjedana. Čestice koje padaju na ledenu i snježnu površinu uzrokuju pozitivnu povratnu petlju; rezultat je smanjenje albeda i povećanje energetske bilance. Između ostalih, ovo je jedan od razloga zbog kojih su klimatske promjene na Arktiku vrlo ubrzane proteklih nekoliko godina.

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