Sea rises and fall with the aid of the moon. You know that.
BTW, the fallbback of glaciers make landmasses RISE. Yet the SL at coasts like Greenland (who has the fastest fallout of creeping glaciers of any landmass in the world) is ....rising.
It's basically rising,,,globally.
As for the global alarmists in the 30's, well, they didn't have much data to build on. The same goes for the temperature records from the era....
As for the rise in temp, - it is both in air and water, - globally. It's manifesting itself with decreasing ice and a raise in SL while the ocean still gets warmer.
If your whisky still heats up even if you have dumped an icecube into it, just check if it's not standing on the stove....