| DOI: | 10.5194/tc-9-2201-2015
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| Scopus记录号: | 2-s2.0-84939268506
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| 论文题名: | Revealing glacier flow and surge dynamics from animated satellite image sequences: Examples from the Karakoram |
| 作者: | Paul F
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| 刊名: | Cryosphere
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| ISSN: | 19940416
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| 出版年: | 2015
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| 卷: | 9, 期:6 | | 起始页码: | 2201
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| 结束页码: | 2214
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| 语种: | 英语
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| 英文关键词: | flow velocity
; glacier advance
; glacier dynamics
; glacier flow
; glacier mass balance
; glacier surge
; image analysis
; Landsat
; satellite imagery
; spatiotemporal analysis
; time series analysis
; Karakoram
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| 英文摘要: | Although animated images are very popular on the internet, they have so far found only limited use for glaciological applications. With long time series of satellite images becoming increasingly available and glaciers being well recognized for their rapid changes and variable flow dynamics, animated sequences of multiple satellite images reveal glacier dynamics in a time-lapse mode, making the otherwise slow changes of glacier movement visible and understandable to the wider public. For this study, animated image sequences were created for four regions in the central Karakoram mountain range over a 25-year time period (1990-2015) from freely available image quick-looks of orthorectified Landsat scenes. The animations play automatically in a web browser and reveal highly complex patterns of glacier flow and surge dynamics that are difficult to obtain by other methods. In contrast to other regions, surging glaciers in the Karakoram are often small (10 km2 or less), steep, debris-free, and advance for several years to decades at relatively low annual rates (about 100 m a−1). These characteristics overlap with those of non-surge-type glaciers, making a clear identification difficult. However, as in other regions, the surging glaciers in the central Karakoram also show sudden increases of flow velocity and mass waves travelling down glacier. The surges of individual glaciers are generally out of phase, indicating a limited climatic control on their dynamics. On the other hand, nearly all other glaciers in the region are either stable or slightly advancing, indicating balanced or even positive mass budgets over the past few decades. © 2015 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/75221
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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: | Department of Geography, University of Zurich, Zurich, Switzerland
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| Recommended Citation: | |
Paul F. Revealing glacier flow and surge dynamics from animated satellite image sequences: Examples from the Karakoram[J]. Cryosphere,2015-01-01,9(6)
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