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A 15-yr duration record of mooring observations from the eastern (.708E) Eurasian Basin (EB) of the Arctic Ocean is used to show and quantify the recently increased oceanic heat flux from intermediate-depth (;150–900m)warmAtlanticWater (AW) to the surfacemixed layer and sea ice. The upward release ofAWheat is regulated by the stability of the overlying halocline, which we show has weakened substantially in recent years. Shoaling of the AW has also contributed, with observations in winter 2017–18 showing AW at only 80m depth, just below thewintertime surfacemixed layer, the shallowest in ourmooring records. Theweakening of the halocline for several months at this time implies that AW heat was linked to winter convection associated with brine rejection during sea ice formation. This resulted in a substantial increase of upward oceanic heat flux during thewinter season, froman average of 3–4Wm in 2007–08 to.10Wm in 2016–18. This seasonalAWheat loss in the easternEB is equivalent to a more than a twofold reduction of winter ice growth. These changes imply a positive feedback as reduced sea ice cover permits increased mixing, augmenting the summer-dominated ice-albedo feedback.

Weakening of Cold Halocline Layer Exposes Sea Ice to Oceanic Heat in the Eastern Arctic Ocean