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标题：Greenland bare-ice albedo from PROMICE automatic weatherstation measurements and Sentinel-3 satellite observations
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作者：Adrien Wehrlé ; Jason E.Box ; Masashi Niwano 等
期刊名称：Geological Survey of Denmark and Greenland Bulletin
印刷版ISSN：1604-8156
出版年度：2021
卷号：47
页码：1-9
语种：English
出版社：De Nationale Geologiske Undersoegelser for Danmark og Groenland
摘要：The Programme for Monitoring of the Greenland Ice Sheet (PROMICE)provides surface meteorological and glaciological measurements from widespread on-ice automatic weather stations since mid-2007. In this study, weuse 105 PROMICE ice-ablation time series to identify the timing of seasonalbare-ice onset preceded by snow cover conditions. From this collection, wefind a bare-ice albedo at ice-ablation onset (here called bare-ice-onset albedo)of 0.565 ± 0.109 that has no apparent spatial dependence among 20 sitesacross Greenland. We then apply this snow-to-ice albedo transition value tomeasure the variations in daily Greenland bare-ice area in Sentinel-3 opticalsatellite imagery covering the extremely low and high respective melt yearsof 2018 and 2019. Daily Greenland bare-ice area peaked at 153 489 km² in2019, 1.9 times larger than in 2018 (80 220 km²), equating to 9.0% (in 2019)and 4.7% (in 2018) of the ice sheet area.
关键词：Greenland ice sheet;albedo;iceablation;PROMICE;Sentinel-3