Report on Antarctic surface hydrology workshop, LDEO, 2018

In February 2018, we hosted a workshop on Antarctic Surface Hydrology and Future Ice-shelf Stability at Lamont-Doherty Earth Observatory, Palisades, New York. Funding for the workshop was provided by the
U.S. National Science Foundation (NSF) Antarctic Glaciology Program (award number: 1743326). The
aims of the workshop were to: (1) establish the state-of-the-science of Antarctic surface hydrology; (2)
identify key science questions raised by observations and theoretical studies of Antarctic surface
hydrology, and (3) move the community toward answering these questions by bringing together scientists
with diverse expertise. The workshop was motivated by the premise that significant gains in our
understanding can be made if researchers with interests in this field are provided with an opportunity to
communicate and develop collaborations across disciplines.

Here we report on the organisation, attendance, and structure of the workshop, before summarizing key
science outcomes, research questions, and future priorities that emerged during the workshop within the
following four themes:
1. Surface melting: controls and observations
2. Water ponding and flow
3. Impact of meltwater on ice-shelf stability
4. Ice-sheet/climate modeling

Finally, building on the emergent science questions, we propose a framework for prioritizing future work,
aimed at understanding and predicting the impact that surface meltwater will have on future Antarctic Ice
Sheet mass balance.