GPS-derived estimates of surface mass balance and ocean-induced basal melt for Pine Island Glacier ice shelf, Antarctica - Shean, D. E.; Christianson, K.; Larson, K. M.; Ligtenberg, S. R. M.; Joughin, I. R.; Smith, B. E.; Stevens, C. M.; Bushuk, M.; Holland, D. M. (The Cryosphere, 2017)