气候变化领域集成服务门户(CCPortal): Change detection of bare-ice albedo in the Swiss Alps

CCPortal

DOI	10.5194/tc-13-397-2019
	Change detection of bare-ice albedo in the Swiss Alps
	Naegeli K.; Huss M.; Hoelzle M.
发表日期	2019
ISSN	19940416
EISSN	13
起始页码	397
结束页码	412
卷号	13 期号:1
英文摘要	Albedo feedback is an important driver of glacier melt over bare-ice surfaces. Light-absorbing impurities strongly enhance glacier melt rates but their abundance, composition and variations in space and time are subject to considerable uncertainties and ongoing scientific debates. In this study, we assess the temporal evolution of shortwave broadband albedo derived from 15 end-of-summer Landsat scenes for the bare-ice areas of 39 large glaciers in the western and southern Swiss Alps. Trends in bare-ice albedo crucially depend on the spatial scale considered. No significant negative temporal trend in bare-ice albedo was found on a regional to glacier-wide scale. However, at higher spatial scales, certain areas of bare ice, including the lowermost elevations and margins of the ablation zones, revealed significant darkening over the study period 1999 to 2016. A total glacier area of 13.5 km 2 (equivalent to about 12% of the average end of-summer bare-ice area in the study area) exhibited albedo trends significant at the 95%confidence level or higher. Most of this area was affected by a negative albedo trend of about-0.05 decade -1 . Generally, bare-ice albedo exhibits a strong interannual variability, caused by a complex interplay of meteorological conditions prior to the acquisition of the data, local glacier characteristics and the date of the investigated satellite imagery. Although a darkening of glacier ice was found to be present over only a limited region, we emphasize that due to the recent and projected growth of bare-ice areas and prolongation of the ablation season in the region, the albedo feedback will considerably enhance the rate of glacier mass loss in the Swiss Alps in the near future. © 2019 Author(s).
学科领域	albedo; annual variation; detection method; glacier; ice cover; Landsat; satellite imagery; temporal evolution; Alps; Switzerland
语种	英语
scopus关键词	albedo; annual variation; detection method; glacier; ice cover; Landsat; satellite imagery; temporal evolution; Alps; Switzerland
来源期刊	The Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/118937
作者单位	Centre for Glaciology, Department of Geography and Earth Sciences, Aberystwyth University, Aberystwyth, United Kingdom; Institute of Geography, Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland; Department of Geosciences, University of Fribourg, Fribourg, Switzerland; Laboratory of Hydraulics, Hydrology and Glaciology (VAW), ETH Zurich, Zurich, Switzerland
推荐引用方式 GB/T 7714	Naegeli K.,Huss M.,Hoelzle M.. Change detection of bare-ice albedo in the Swiss Alps[J],2019,13(1).
APA	Naegeli K.,Huss M.,&Hoelzle M..(2019).Change detection of bare-ice albedo in the Swiss Alps.The Cryosphere,13(1).
MLA	Naegeli K.,et al."Change detection of bare-ice albedo in the Swiss Alps".The Cryosphere 13.1(2019).