Havis omfang (SIE) indeks

Havis omfang (SIE) indeks [mln km2] giver et hurtigt kig på ændringer i havisen i Arktis. Det giver daglig konsekvent forarbejdet isgrad og koncentration fra billeder taget af Nimbus 7-satellit siden 1979. SIE-indeksets værdier beregnes ved at opsummere arealet af alle gitterceller 25×25 km med 15% eller større iskoncentration.

Det daglige indeks viser isudstrækning med en oversigt over den typiske udstrækning for den dag baseret på en 30-årig (1981-2010) median. Siden 1979 har vinterhavets omfang i Arktis faldet omkring 3 procent pr. Årti.

 

Sea Ice Extent in the Arctic, source: www.nsidc.org

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