Plot of arctic sea ice extent development between 1979 and 2023 in monthly mean values. For the determination of the "area" value, every pixel with a sea ice concentration &gt; .15 is taken. The pixel area is multiplied with the concentration value derived from the passive infrared signal. For the "extent" value, the concentration value is taken as 1, so we basically get full area with &gt;.15 concentration.
Own work
Dominiklenne