Imagine you’re standing near the edge of the Antarctic Ice Sheet, gazing out over the ocean, when the ice near you starts to melt very rapidly. A surge of meltwater flows into the ocean. Surprisingly, you watch the sea level fall – not rise.
But why? When we think of sea level rise, we picture oceans rising uniformly. But the sea is not like a bucket of water. It is bumpy and uneven. Gravity plays a vital role. Water is heavy. And unlike rocks, this enormous mass moves easily. Ice melts, snow and rain falls, rivers run, water evaporates and forms clouds. When ice melts, its weight shifts from land to sea and back again.
