There are several research centers that monitor Arctic ice extent, especially NSIDC (USA), DMI (Denmark), JAXA (Japan), and NANSEN (Norway). All start with the same data from passive microwave sensors on NASA satellites. Slight differences arise from different algorithms used to process the inputs into ice extent estimates. Operational ice charts are an alternative measure … Continue reading Everything You Wanted to Know about Measuring Arctic Ice (But Were Afraid to Ask)