Likely basal frozen/thawed state of the Greenland Ice Sheet. === Original Data Source === Likely Basal Thermal State of the Greenland Ice Sheet The Likely Basal Thermal State of the Greenland Ice Sheet product at the National Snow and Ice Data Center contains key datasets that show how the likely basal thermal state was inferred from existing airborne and satellite datasets and recent methods, and provides a synthesis mask of the likely basal thermal state over the Greenland Ice Sheet (MacGregor et al. 2016), which is displayed in QGreenland. MacGregor, J.A., M.A. Fahnestock, G.A. Catania, A. Aschwanden, G.D. Clow, W.T. Colgan, S.P. Gogineni, M. Morlighem, S.M.J. Nowicki, J.D. Paden, S.F. Price and H. Seroussi. 2016. A synthesis of the basal thermal state of the Greenland Ice Sheet, Journal of Geophysical Research Earth Surface, 121:1328–1350, doi:10.1002/2015JF003808. Citation: MacGregor, J. A., M. Fahnestock, G. Catania, J. Paden, P. Gogineni, M. Morlighem, W. Colgan, S. M. Nowicki, G. Clow, A. Aschwanden, S. F. Price, and H. Seroussi. 2017. Likely Basal Thermal State of the Greenland Ice Sheet, Version 1. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: https://doi.org/10.5067/R4MWDWWUWQF9. Citation URL: https://nsidc.org/data/rdbts4/versions/1