- Satellite records show that saltwater ice on the Arctic Ocean has dwindled rapidly in the span of a few years.The Arctic’s sea ice lost around 12.5% of its volume between 2018 and 2021, mostly because the ‘multiyear’ ice that persists through the summer melt is thinning. https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2021GL097448 2 comments science