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I am currently reading a paper which says

The elevation ranges between 1700 and 2200 m show smaller relative surface changes than the elevation ranges between 2200 and 3300 m. This has to be related to:

The biggest glaciers where the surface loss on the glacier banks for a considered elevation range can be partly counter-balanced by the surface elevation lowering introducing an apparent shift of the contour lines.

What I want to understand is the "surface elevation lowering" phenomenon that the paper refers to.

Ref: Gardent, Marie, et al. "Multitemporal glacier inventory of the French Alps from the late 1960s to the late 2000s." Global and Planetary Change 120 (2014): 24-37.

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