气候变化领域集成服务门户(CCPortal): Surface energy fluxes on Chilean glaciers: Measurements and models

CCPortal

DOI	10.5194/tc-14-2545-2020
	Surface energy fluxes on Chilean glaciers: Measurements and models
	Schaefer M.; Fonseca-Gallardo D.; Fariás-Barahona D.; Casassa G.
发表日期	2020
ISSN	19940416
起始页码	2545
结束页码	2565
卷号	14 期号:8
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).
英文关键词	cloud cover; energy flux; freshwater input; glacier dynamics; glacier mass balance; heat flux; melting; Andes; Chile; Patagonia; Atacama
语种	英语
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202199
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
推荐引用方式 GB/T 7714	Schaefer M.,Fonseca-Gallardo D.,Fariás-Barahona D.,et al. Surface energy fluxes on Chilean glaciers: Measurements and models[J],2020,14(8).
APA	Schaefer M.,Fonseca-Gallardo D.,Fariás-Barahona D.,&Casassa G..(2020).Surface energy fluxes on Chilean glaciers: Measurements and models.Cryosphere,14(8).
MLA	Schaefer M.,et al."Surface energy fluxes on Chilean glaciers: Measurements and models".Cryosphere 14.8(2020).