However, summer radiation is not affected - the Sun pumps out as usual - and so despite what's happening to the seas, the earth mass heats up, and this heating effect is greater because the reflective (and cooling) value of the ice is lessened as it changes from white ice into dark sea and from being a reflector, turns into an absorber of heat.
The longer this continues and the less ice there is to reflect sunlight, the momentum changes from an initial cooling of ocean waters due to the original inflow of melted ice, into a gradual heating, as that colder water is no longer produced as the ice will have lessened until vanished completely."
And in addition to that, climatologists are observing another change in weather systems. The jetstream over the Arctic region, that is instrumental in distributing the heat in the atmosphere just like the oceans are doing with gulf streams, tends to meander in a North/South direction as it travels East. That meandering caused High-pressure systems to be replaced by Low-pressure and thus a change in precipitation at given locations.
Now, that meandering is slowing down because the heat difference between the equator and the Poles is getting smaller. This then causes High-pressure systems to linger on at certain locations longer than they used to, and thus cause prolonged/more severe heatwaves.
Exactly as predicted, the extremes are becoming more extreme, and it's already noticeable and getting more prominent. Lows are slowly getting a bit higher, and high are getting much higher. So there will still be cold-spells and heat-spells, but their amplitude is increasing and their average is creeping up.