Greenland ice-sheet contribution to sea-level rise buffered by meltwater storage in firn : Nature
This is quite an interesting abstract about what is happening to melt water in Greenland. It's possibly not contributing much to sea level rise at the moment because a lot it may be sinking, filling in gaps in the partly compacted snow (know as "firn" - you learn something every day) and refreezing.
The article estimates that this process may go on for decades as a buffering effect to the contribution to sea level rise, although it also notes that " once the pore space is filled it cannot quickly be regenerated."
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