Glacier length changes - Temporal overview on short-term glacier length changes. The number of advancing (blue) and retreating (red) glaciers are plotted as stacked columns in the corresponding survey year. This figure shows 30 420 length change observations with a time range of less than 4 years (between survey and reference year). This corresponds to almost 85 per cent of the reported data which ... in addition include observations covering a longer time scale and/or stationary conditions. The time period of glacier LIA maximum extents is given according to the regional information in Chapter 6 (http://www.grid.unep.ch/glaciers/pdfs/glaciers.pdf). Note that the scaling of the number of glaciers on the y-axis changes between the regions.
Source: figure based on data analysis by R. Prinz, University of Innsbruck, Austria; data from WGMS.