remote sensing Article Consequences of the 2019 Greenland Ice Sheet Melt Episode on Albedo Arthur Elmes 1,* , Charlotte Levy 1 , Angela Erb 1, Dorothy K. Hall 2, Ted A. Scambos 3 , Nicolo DiGirolamo 4 and Crystal Schaaf 1 1 School for the Environment, University of Massachusetts Boston, 100 William T. Morrissey Blvd, Boston, MA 02125, USA;
[email protected] (C.L.);
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[email protected] (C.S.) 2 Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD 20470, USA;
[email protected] 3 Earth Science Observation Center, Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO 80303, USA;
[email protected] 4 Science Systems and Applications, Inc., Lanham, MD 20706, USA;
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[email protected]; Tel.: +1-304-906-7946 Abstract: In mid-June 2019, the Greenland ice sheet (GrIS) experienced an extreme early-season melt event. This, coupled with an earlier-than-average melt onset and low prior winter snowfall over western Greenland, led to a rapid decrease in surface albedo and greater solar energy absorption over the melt season. The 2019 melt season resulted in significantly more melt than other recent years, even compared to exceptional melt years previously identified in the moderate-resolution imaging spectroradiometer (MODIS) record. The increased solar radiation absorbance in 2019 warmed the surface and increased the rate of meltwater production. We use two decades of satellite-derived albedo from the MODIS MCD43 record to show a significant and extended decrease in albedo in Greenland during 2019.