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Previous in situ measurements have indicated a slight mass gain at MuztaghAta in the eastern Pamir, contrary to the global trend. We extend thesemeasurements both in space and time by using remote sensing data and presentfour decades of glacier variations in the entire mountain massif. Geodeticmass balances and area changes were determined at glacier scale from stereosatellite imagery and derived digital elevation models (DEMs). This includesHexagon KH-9 (year 1973), ALOS-PRISM~(2009), Pléiades (2013) and Landsat7 ETM+ data in conjunction with the SRTM-3 DEM (2000). In addition, surfacevelocities of Kekesayi Glacier, the largest glacier at Muztagh Ata, werederived from amplitude tracking of TerraSAR-X images (2011). Locally, weobserved strong spatial and temporal glacier variations during the last fourdecades, which were, however, on average not significant for the entiremassif. Some south-west-exposed glaciers fluctuated or advanced, whileglaciers with other aspects rather experienced continuous shrinkage. Severalglaciers such as Kekesayi indicate no measurable change at their frontalposition, but clear down-wasting despite mostly thick debris coverage at lowaltitudes. The surface velocity of this debris-covered glacier reach up to20 cm per day, but the lowest part of the tongue appears to be stagnant. Thelow velocity or even stagnancy at the tongue is likely one reason for thedown-wasting. On average, the glaciers showed a small, insignificantshrinkage from 274.3 ± 10.6 km2 in 1973 to272.7 ± 1.0 km2 in 2013 (−0.02 ± 0.1 % a−1).Average mass changes in the range of −0.03 ± 0.33 m w.e. a−1(1973–2009) to −0.01 ± 0.30 m w.e. a−1 (1973–2013) revealnearly balanced budgets for the last 40 years. Indications of slightlypositive rates after 1999 (+0.04 ± 0.27 m w.e. a−1) are notsignificant, but confirmed by measurements in the field

Four decades of glacier variations at Muztagh Ata (eastern Pamir): a multi-sensor study including Hexagon KH-9 and Pléiades data