In the paper, Ocean Bottom Deformation Due To Present-Day Mass Redistribution and Its Impact on Sea Level Observations, the authors state that:
Due to changes in the land ice mass balance and land hydrology, the oceans have gained mass over the past decades (Chambers et al., 2016), which results in an increase of the total load on the ocean bottom.
We use realistic estimates of mass redistribution from ice mass loss and land water storage
The largest differences can be found in the Arctic Ocean: due to the location close to many melt sources, the relative sea level in the Arctic drops, while geocentric sea level rises,
I don't understand how melting ice increases the mass of the ocean? Are they referring to ice normally residing on land, not the ice shelves that rest in the ocean?