and Global Temperature indicator).Ī glacier is a large mass of snow and ice that has accumulated over many years and is present year-round. and global temperatures during this time period (see the U.S. 4, 5 Observations of glaciers losing mass are also consistent with warming trends in U.S. reference glaciers are consistent with the retreat of glaciers observed throughout the western United States, Alaska, and other parts of the world. Year-to-year trends vary, with some glaciers gaining mass in certain years (for example, Wolverine Glacier during the 1980s), but the measurements clearly indicate a loss of glacier mass over time. reference glaciers have shown an overall decline in mass balance since the 1950s and 1960s and an accelerated rate of decline in recent years (see Figure 2). The rate at which glaciers are losing mass appears to have accelerated over roughly the last decade. A longer measurement record from a smaller number of glaciers suggests that they have been shrinking since the 1950s. On average, glaciers worldwide have been losing mass since at least the 1970s (see Figure 1), which in turn has contributed to observed changes in sea level (see the Sea Level indicator).
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