Integrated borehole, radar, and seismic velocity analysis reveals dynamic spatial variations within a firn aquifer in southeast Greenland - Killingbeck, Siobhan; Schmerr, N.; Montgomery, L.; Booth, A.; Livermore, P.; Miller, Olivia; Guandique, J.; Burdick, S.; Forster, R.; Koenig, L.; Legchenko, Anatoly; Ligtenberg, S. R. M.; et al. (Geophysical Research Letters, 2020)