I am a climate scientist and geologist and think that climate, geology, and geography are incredibly interesting fields that people deserve to know more about. If you have any questions that you’ve sat with for a while, are just curious, want to know more about future or past scenarios, or even have worldbuilding questions, feel free to ask!
Not so much pressure on the seafloor that will matter, but changes in density are almost certainly going to impact currents and heat distribution. Winter in Europe is going to get very, very cold when the relatively warm Gulf Stream can not transfer its warmth to the air as effectively when it is stuck sitting underneath a 0.1°C layer of less dense fresh water that just melted from glaciers in Greenland, which is already measurably happening. It’s pretty much the only place on the planet seeing an average drop in sea surface temperature for that reason.
