Greenland bare-ice albedo from PROMICE automatic weather station measurements and Sentinel-3 satellite observations

IF 2 4区 地球科学 Q1 GEOLOGY
A. Wehrlé, J. Box, M. Niwano, A. Anesio, R. Fausto
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引用次数: 13

Abstract

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, we use 105 PROMICE ice-ablation time series to identify the timing of seasonal bare-ice onset preceded by snow cover conditions. From this collection, we find 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 sites across Greenland. We then apply this snow-to-ice albedo transition value to measure the variations in daily Greenland bare-ice area in Sentinel-3 optical satellite imagery covering the extremely low and high respective melt years of 2018 and 2019. Daily Greenland bare-ice area peaked at 153 489 km² in 2019, 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.
格陵兰岛裸冰反照率来自PROMICE自动气象站测量和Sentinel-3卫星观测
格陵兰冰盖监测计划(PROMICE)提供了自2007年中期以来广泛分布的冰上自动气象站的地表气象和冰川测量数据。在这项研究中,我们使用105个PROMICE冰消融时间序列来确定季节性裸冰开始的时间,而不是积雪条件。从这些数据中,我们发现冰消融开始时的裸冰反照率(这里称为裸冰反照率)为0.565±0.109,在格陵兰岛的20个站点中没有明显的空间依赖性。然后,我们应用该冰雪反照率过渡值来测量Sentinel-3光学卫星图像中格陵兰裸冰面积的日变化,这些图像分别覆盖了2018年和2019年的极低和高融化年份。2019年,格陵兰岛每日裸冰面积达到153 489平方公里的峰值,是2018年(80 220平方公里)的1.9倍,相当于冰盖面积的9.0%(2019年)和4.7%(2018年)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Geus Bulletin
Geus Bulletin GEOLOGY-
CiteScore
2.80
自引率
17.60%
发文量
8
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