DOI: 10.5194/tc-15-547-2021
论文题名: Annual and inter-annual variability and trends of albedo of Icelandic glaciers
作者: Gunnarsson A. ; Gardarsson S.M. ; Pálsson F. ; Jóhannesson T. ; Sveinsson O.G.B.
刊名: Cryosphere
ISSN: 19940416
出版年: 2021
卷: 15, 期: 2 起始页码: 547
结束页码: 570
语种: 英语
英文关键词: albedo
; annual variation
; automation
; melting
; MODIS
; radiative forcing
; satellite data
; solar radiation
; trend analysis
; Iceland
英文摘要: During the melt season, absorbed solar energy, modulated at the surface predominantly by albedo, is one of the main governing factors controlling surface-melt variability for glaciers in Iceland. Using MODIS satellite-derived daily surface albedo, a gap-filled temporally continuous albedo product is derived for the melt season (May to August (MJJA)) for the period 2000-2019. The albedo data are thoroughly validated against available in situ observations from 20 glacier automatic weather stations for the period 2000-2018. The results show that spatiooral patterns for the melt season have generally high annual and inter-annual variability for Icelandic glaciers, ranging from high fresh-snow albedo of about 85 %-90 % in spring to 5 %-10 % in the impurity-rich bare-ice area during the peak melt season. The analysis shows that the volcanic eruptions in 2010 and 2011 had significant impact on albedo and also had a residual effect in the following years. Furthermore, airborne dust, from unstable sandy surfaces close to the glaciers, is shown to enhance radiative forcing and decrease albedo. A significant positive albedo trend is observed for northern Vatnajökull while other glaciers have non-significant trends for the study period. The results indicate that the high variability in albedo for Icelandic glaciers is driven by climatology, i.e. snow metamorphosis, tephra fallout during volcanic eruptions and their residual effects in the post-eruption years, and dust loading from widespread unstable sandy surfaces outside the glaciers. This illustrates the challenges in albedo parameterization for glacier surface-melt modelling for Icelandic glaciers as albedo development is driven by various complex phenomena, which may not be correctly captured in conventional energy-balance models. © 2021 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164698
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: University of Iceland, Civil and Environmental Engineering, Hjardarhagi 2-6, Reykjavík, 107, Iceland; Institute of Earth Sciences, University of Iceland, Sturlugata 7, Reykjavík, 101, Iceland; Icelandic Meteorological Office, Bústaðavegi 7-9, Reykjavík, 105, Iceland; Landsvirkjun, Department of Research and Development, Reykjavík, 107, Iceland
Recommended Citation:
Gunnarsson A.,Gardarsson S.M.,Pálsson F.,et al. Annual and inter-annual variability and trends of albedo of Icelandic glaciers[J]. Cryosphere,2021-01-01,15(2)