This article refers to a 1981-2010 Median: http://nsidc.org/arcticseaicenews/2020/07/laptev-sea-lapping-up-the-heat-in-june/ http://nsidc.org/arcticseaicenews/

This article refers to a 1981-2010 Median: http://nsidc.org/arcticseaicenews/2020/07/laptev-sea-lapping-up-the-heat-in-june/ http://nsidc.org/arcticseaicenews/2020/07/laptev-sea-lapping... Edit: Another graph goes back to 1979.