Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2016WR020126 |
Patterns of glacier ablation across North-Central Chile: Identifying the limits of empirical melt models under sublimation-favorable conditions | |
Ayala, A.1; Pellicciotti, F.1,2; MacDonell, S.3; McPhee, J.4,5; Burlando, P.1 | |
2017-07-01 | |
发表期刊 | WATER RESOURCES RESEARCH
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ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2017 |
卷号 | 53期号:7 |
文章类型 | Article |
语种 | 英语 |
国家 | Switzerland; England; Chile |
英文摘要 | We investigate the energy balance and ablation regimes of glaciers in high-elevation, dry environments using glaciometeorological data collected on six glaciers in the semiarid Andes of North-Central Chile (29-34 degrees S, 3127-5324 m). We use a point-scale physically based energy balance (EB) model and an enhanced Temperature-Index (ETI) model that calculates melt rates only as a function of air temperature and net shortwave radiation. At all sites, the largest energy inputs are net shortwave and incoming longwave radiation, which are controlled by surface albedo and elevation, respectively. Turbulent fluxes cancel each other out at the lower sites, but as elevation increases, cold, dry and wind-exposed conditions increase the magnitude of negative latent heat fluxes, associated with large surface sublimation rates. In midsummer (January), ablation rates vary from 67.9 mm w.e.d(-1) at the lowest site (similar to 100% corresponding to melt), to 2.3 mm w.e. d(-1) at the highest site (>85% corresponding to surface sublimation). At low-elevation, low-albedo, melt-dominated sites, the ETI model correctly reproduces melt using a large range of possible parameters, but both the performance and parameter transferability decrease with elevation for two main reasons: (i) the air temperature threshold approach for melt onset does not capture the diurnal variability of melt in cold and strong irradiated environments and (ii) energy losses decrease the correlation between melt and net shortwave radiation. We summarize our results by means of an elevation profile of ablation components that can be used as reference in future studies of glacier ablation in the semiarid Andes. |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000407895000023 |
WOS关键词 | SURFACE-ENERGY-BALANCE ; TEMPERATURE-INDEX ; MASS-BALANCE ; PASCUA-LAMA ; DRY ANDES ; WATER AVAILABILITY ; SNOW SUBLIMATION ; SEMIARID ANDES ; ZONGO GLACIER ; ROCK GLACIERS |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/22034 |
专题 | 资源环境科学 |
作者单位 | 1.Swiss Fed Inst Technol, Inst Environm Engn, Dept Civil Environm & Geomat Engn, Zurich, Switzerland; 2.Northumbria Univ, Fac Engn & Environm, Dept Geog, Newcastle Upon Tyne, Tyne & Wear, England; 3.CEAZA, La Serena, Chile; 4.Univ Chile, Fac Phys & Math Sci, Dept Civil Engn, Santiago, Chile; 5.Univ Chile, Fac Phys & Math Sci, AMTC, Santiago, Chile |
推荐引用方式 GB/T 7714 | Ayala, A.,Pellicciotti, F.,MacDonell, S.,et al. Patterns of glacier ablation across North-Central Chile: Identifying the limits of empirical melt models under sublimation-favorable conditions[J]. WATER RESOURCES RESEARCH,2017,53(7). |
APA | Ayala, A.,Pellicciotti, F.,MacDonell, S.,McPhee, J.,&Burlando, P..(2017).Patterns of glacier ablation across North-Central Chile: Identifying the limits of empirical melt models under sublimation-favorable conditions.WATER RESOURCES RESEARCH,53(7). |
MLA | Ayala, A.,et al."Patterns of glacier ablation across North-Central Chile: Identifying the limits of empirical melt models under sublimation-favorable conditions".WATER RESOURCES RESEARCH 53.7(2017). |
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