| DOI: | 10.5194/tc-7-1787-2013
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| Scopus记录号: | 2-s2.0-84890298050
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| 论文题名: | Modeling energy and mass balance of shallap glacier, Peru |
| 作者: | Gurgiser W; , Marzeion B; , Nicholson L; , Ortner M; , Kaser G
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| 刊名: | Cryosphere
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| ISSN: | 19940416
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| 出版年: | 2013
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| 卷: | 7, 期:6 | | 起始页码: | 1787
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| 结束页码: | 1802
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| 语种: | 英语
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| 英文关键词: | ablation
; glacier dynamics
; mass balance
; measurement method
; meteorology
; numerical model
; precipitation (climatology)
; shortwave radiation
; Peru
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| 英文摘要: | We calculated the distributed surface mass and energy balance of Shallap Glacier, Cordillera Blanca, Peru (9 S, 77 W, 4700-5700 m a.s.l., ∼ 7 km2), on hourly time steps for two years (September 2006-August 2008) using a process-based model and meteorological measurements as input. Model parameter combinations were optimized against 21 temporal readings of 20 stakes in the ablation zone of the glacier. Uncertainty caused by model input parameters and parameterization schemes was estimated using a leave-one out cross-validation scheme, which yields values of root mean square deviation (RMSD) of surface height change < 1 m (< 10% of the measured amplitude) for all stakes. With the best parameter combination (smallest RMSD) applied, the modeled annual surface mass balance of the glacier was -0.32 ± 0.4 m w.e. (water equivalent) for September 2006-August 2007 and 0.51 ± 0.56 m w.e. for September 2007-August 2008. While the mass balance above 5000 m was similar in both years (Δ 0.33 ± 0.68 m w.e.) due to similar annual sums of solid precipitation, a difference of 1.97 ± 0.68 m w.e. was calculated for the lower parts of the glacier. This difference is associated with more frequent occurrence of higher snow line altitudes during the first year, which was mainly caused by a higher fraction of liquid precipitation due to higher mean air temperatures. As the net shortwave budget was found to be the main source for ablation throughout the year at Shallap Glacier, lower surface albedo especially caused by lower solid precipitation amounts explains most of the difference in modeled ablation and mass balance between the two years. © 2013 Author(s). |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/74927
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| 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: | Center for Climate and Cryosphere, University of Innsbruck, Innsbruck, Austria
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| Recommended Citation: | |
Gurgiser W,, Marzeion B,, Nicholson L,et al. Modeling energy and mass balance of shallap glacier, Peru[J]. Cryosphere,2013-01-01,7(6)
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