DOI: 10.5194/tc-14-2545-2020
论文题名: Surface energy fluxes on Chilean glaciers: Measurements and models
作者: Schaefer M. ; Fonseca-Gallardo D. ; Fariás-Barahona D. ; Casassa G.
刊名: Cryosphere
ISSN: 19940416
出版年: 2020
卷: 14, 期: 8 起始页码: 2545
结束页码: 2565
语种: 英语
英文关键词: cloud cover
; energy flux
; freshwater input
; glacier dynamics
; glacier mass balance
; heat flux
; melting
; Andes
; Chile
; Patagonia
; Atacama
英文摘要: The surface energy fluxes of glaciers determine surface melt, and their adequate parametrization is one of the keys to a successful prediction of future glacier mass balance and freshwater discharge. Chile hosts glaciers in a large range of latitudes under contrasting climatic settings: from 18° S in the Atacama Desert to 55° S on Tierra del Fuego. Using three different methods, we computed surface energy fluxes for five glaciers which represent the main glaciological zones of Chile. We found the main energy sources for surface melt change from the Central Andes, where the net shortwave radiation is driving the melt, to Patagonia, where the turbulent fluxes are an important source of energy. We inferred higher surface melt rates for Patagonian glaciers as compared to the glaciers of the Central Andes due to a higher contribution of the turbulent sensible heat flux, less negative net longwave radiation and a positive contribution of the turbulent latent heat flux. The variability in the atmospheric emissivity was high and not able to be explained exclusively by the variability in the inferred cloud cover. The influence of the stability correction and the roughness length on the magnitude of the turbulent fluxes in the different climate settings was examined. We conclude that, when working towards physical melt models, it is not sufficient to use the observed melt as a measure of model performance; the model parametrizations of individual components of the energy balance have to be validated individually against measurements. © 2020 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164577
Appears in Collections: 气候变化与战略
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作者单位: Instituto de Ciencias Físicas y Matemáticas, Facultad de Ciencias, Austral University of Chile, Valdivia, Chile; Institut für Geographie, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany; Dirección General de Aguas, Ministerio de Obras Públicas, Santiago, Chile; Centro de Investigación Gaia Antártica, Universidad de Magallanes, Punta Arenas, Chile
Recommended Citation:
Schaefer M.,Fonseca-Gallardo D.,Fariás-Barahona D.,et al. Surface energy fluxes on Chilean glaciers: Measurements and models[J]. Cryosphere,2020-01-01,14(8)