Glacier surges in the north-west West Kunlun Shan inferred from 1972 to 2017 Landsat imagery

The West Kunlun Shan lie close to, or are perhaps part of, two significant glaciological phenomena – the High Mountain Asia surge ‘supercluster’ and the Karakoram Anomaly. However, glaciological studies, and particularly surge studies, in the range are limited. Here, we extend the database of known...

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Bibliographic Details
Published in:Journal of glaciology 2019-02, Vol.65 (249), p.1-12
Main Authors: CHUDLEY, THOMAS R., WILLIS, IAN C.
Format: Article
Language:English
Subjects:
Climate change
Deceleration
Dynamics
Flow velocity
Glacier surges
Glacier velocities
Glaciers
Hydrology
ice velocity
Imagery
Landsat
Landsat satellites
Remote sensing
Satellite imagery
Studies
Surges
Surging (ship motion)
Tracking
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Summary:The West Kunlun Shan lie close to, or are perhaps part of, two significant glaciological phenomena – the High Mountain Asia surge ‘supercluster’ and the Karakoram Anomaly. However, glaciological studies, and particularly surge studies, in the range are limited. Here, we extend the database of known surges in the region using Landsat imagery and cross-correlation feature tracking. We examine 88 glaciers larger than 1 km2 in the Hotan Prefecture of Xinjiang, China, and find evidence of nine surges occurring between 1972 and 2017. Glaciers display low active phase velocities (~0.2–1.5 km a−1) that show seasonal acceleration in the summer, active phase periods as short as 2 years, and build-up and deceleration phases of months--years. Although these observations display characteristics indicative of both the classic hydrological and thermal switch mechanisms, the surging observed displays a close resemblance to that in the adjacent Karakoram ranges. Furthermore, the majority of the surges occur clustered at the end of a decadal-scale warming period, corroborating previously proposed causal links between climate and surging in the Karakoram. We suggest that the two regions should be considered part of one larger system when considering surge dynamics in High Mountain Asia.
ISSN:0022-1430
1727-5652
DOI:10.1017/jog.2018.94