How robust are in situ observations for validating satellite-derived albedo over the dark zone of the Greenland Ice Sheet?

Jonathan Ryan, Aberystwyth University, Aberystwyth, SY23, United Kingdom; University of California Los Angeles, Geography, Los Angeles, CA, United States, Alun Hubbard II, Aberystwyth University, Geography & Earth Sciences, Aberystwyth, United Kingdom; CAGE - Centre for Arctic Gas Hydrate, Environment and Climate, UiT The Arctic University of Norway, Department of Geoscience, Tromsø, Norway, Tristram D Irvine-Fynn, Aberystwyth University, Department of Geography and Earth Sciences, Aberystwyth, SY23, United Kingdom, Samuel Huckerby Doyle, Aberystwyth University, Department of Geography and Earth Sciences, Aberystwyth, United Kingdom, Joseph Cook, University of Sheffield, School of Geography, Sheffield, S10, United Kingdom, Marek Stibal, Charles University, Department of Ecology, Prague, Czech Republic, Laurence C Smith, Brown University, Department of Earth, Environmental and Planetary Sciences (DEEPS), Providence, United States and Jason E Box, Geological Survey of Denmark and Greenland, København K, Denmark