期刊
JOURNAL OF GLACIOLOGY
卷 61, 期 227, 页码 524-536出版社
CAMBRIDGE UNIV PRESS
DOI: 10.3189/2015JoG14J227
关键词
debris-covered glaciers; glacier mapping; glacier surges
资金
- United Kingdom's Department for International Development (DFID), through core research at the International Centre for Integrated Mountain Development
Spatial evolution of supraglacial debris cover on mountain glaciers is a largely unmonitored and poorly understood phenomenon that directly affects glacier melt. Supraglacial debris cover for 93 glaciers in the Karakoram, northern Pakistan, was mapped from Landsat imagery acquired in 1977, 1998, 2009 and 2014. Surge-type glaciers occupy 41% of the study area and were considered separately. The time series of debris-covered surface area change shows a mean value of zero or near-zero change for both surging and non-surging glaciers. An increase in debris-covered area is often associated with negative regional mass balances. We extend this logic to suggest that the stable regional mass balances in the Karakoram explain the zero or near-zero change in debris-covered area. This coupling of trends combined with our 37 year time series of data suggests the Karakoram anomaly extends further back in time than previously known.
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