Nice work! If using Photoshop or many other image editors it is pretty easy, use the text tool in each frame, but I dont know what editor you are using?
But I sure we can make use of your talent in "our" documentation department.
Back to the animation, you can easily see a lot ice was moved away in those few days. When we get into the real melting season there will be many more actions both here and other glaciers as well as sea ice movements.
Size is perfect for this event, and the "weight" 5 -600 kb is fine nowadays, but more frames more "weight"!