DOI: 10.5194/tc-7-1513-2013
Scopus记录号: 2-s2.0-84885142541
论文题名: Meteorological drivers of ablation processes on a cold glacier in the semi-arid Andes of Chile
作者: Macdonell S ; , Kinnard C ; , Mölg T ; , Nicholson L ; , Abermann J
刊名: Cryosphere
ISSN: 19940416
出版年: 2013
卷: 7, 期: 5 起始页码: 1513
结束页码: 1526
语种: 英语
英文关键词: albedo
; climate effect
; energy budget
; episodic event
; glacier dynamics
; latent heat flux
; longwave radiation
; mass balance
; melting
; precipitation (climatology)
; semiarid region
; shortwave radiation
; vapor pressure
; Andes
; Chile
; Guanaco Glacier
; South America
英文摘要: Meteorological and surface change measurements collected during a 2.5 yr period are used to calculate surface mass and energy balances at 5324 m a.s.l. on Guanaco Glacier, a cold-based glacier in the semi-arid Andes of Chile. Meteorological conditions are marked by extremely low vapour pressures (annual mean of 1.1 hPa), strong winds (annual mean of 10 m s-1), shortwave radiation receipt persistently close to the theoretical site maximum during cloud-free days (mean annual 295 W m-2; summer hourly maximum 1354 W m-2) and low precipitation rates (mean annual 45 mm w.e.). Snowfall occurs sporadically throughout the year and is related to frontal events in the winter and convective storms during the summer months. Net shortwave radiation provides the greatest source of energy to the glacier surface, and net longwave radiation dominates energy losses. The turbulent latent heat flux is always negative, which means that the surface is always losing mass via sublimation, which is the main form of ablation at the site. Sublimation rates are most strongly correlated with net shortwave radiation, incoming shortwave radiation, albedo and vapour pressure. Low glacier surface temperatures restrict melting for much of the period, however episodic melting occurs during the austral summer, when warm, humid, calm and high pressure conditions restrict sublimation and make more energy available for melting. Low accumulation (131 mm w.e. over the period) and relatively high ablation (1435 mm w.e.) means that mass change over the period was negative (-1304 mm w.e.), which continued the negative trend recorded in the region over the last few decades. © 2013 Authors(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74942
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Centro de Estudios Avanzados en Zonas Áridas, La Serena, Chile; Department of Climatology, Technische Universität Berlin, Berlin, Germany; Centre for Climate and Cryosphere, University of Innsbruck, Innsbruck, Austria
Recommended Citation:
Macdonell S,, Kinnard C,, Mölg T,et al. Meteorological drivers of ablation processes on a cold glacier in the semi-arid Andes of Chile[J]. Cryosphere,2013-01-01,7(5)