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Glacier Quick Facts | National Snow and Ice Data Center What is a glacier? A glacier is an accumulation of ice and snow that slowly flows over land Alpine glaciers are frozen rivers of ice, slowly flowing under their own weight down mountainsides and into valleys Ice sheets exist only on Greenland and Antarctica, and they spread out in broad domes in multiple directions
Glaciers - National Snow and Ice Data Center What is a glacier? A glacier is an accumulation of ice and snow that slowly flows over land At higher elevations, more snow typically falls than melts, adding to its mass Eventually, the surplus of built-up ice begins to flow downhill At lower elevations, there is usually a higher rate of melt or icebergs break off that removes ice mass Alpine glaciers are frozen rivers of ice, slowly
Science of Glaciers | National Snow and Ice Data Center What is the lifecycle of a glacier, and what factors influence its lifecycle? The amount of precipitation, whether in the form of snowfall, freezing rain, avalanches, or wind-drifted snow, is important to glacier survival For instance, in very dry parts of Antarctica, low temperatures are ideal for glacier growth, but the small amount of net annual precipitation causes the glaciers to grow
Why Glaciers Matter | National Snow and Ice Data Center Glacier melt delivers nutrients into lakes, rivers, and oceans Those nutrients can drive blooms of phytoplankton—the base of aquatic and marine food chains Meanwhile, gradual glacier melt sustains stream habitats for plants and animals So, glaciers often have an indirect impact on wildlife and fisheries
Learn - National Snow and Ice Data Center Quick facts, basic science, and information about snow, ice, and why the cryosphere matters The cryosphere includes all of the snow and ice-covered regions across the planet
Global PyGEM-OGGM Glacier Projections with RCP and SSP Scenarios . . . This data set comprises results from a hybrid glacier evolution model that uses the mass balance module of the Python Glacier Evolution Model (PyGEM) and the glacier dynamics module of the Open Global Glacier Model (OGGM) Output parameters include projections of glacier mass change, fixed runoff, and various mass balance components at regionally aggregated and glacier scales
glacier - National Snow and Ice Data Center glacier a mass of ice that originates on land, usually having an area larger than one tenth of a square kilometer; many believe that a glacier must show some type of movement; others believe that a glacier can show evidence of past or present movement
Seeking the world’s largest glaciers - National Snow and Ice Data Center What defines a glacier? What are the world’s three largest glaciers? What are the largest glaciers in each region of the world? As often as the rapidly changing cryosphere is making headlines, from stories on dwindling Arctic sea ice to thawing permafrost to melting ice sheets, one would think the answers to these questions would be obvious and easy to find
Ice Sheets Today - National Snow and Ice Data Center Due to non-renewed funding, Ice Sheets Today will soon suspend several tools and services Discontinued: Analysis posts Persisting: Greenland Daily Melt Images (updating through October 2025 as normal, may resume as normal in April 2026) Greenland Surface Melt Extent Interactive Chart (updates paused since September 24 due to a temporary SSMIS data delay; may update through October if data
Sea Ice Today - National Snow and Ice Data Center Sea ice data is updated daily, with a one-day lag On occasion, there is data delay which is usually resolved within a few days The orange line in extent and concentration images (left and middle) and the gray line in the time series (right) indicate 1981 to 2010 average extent for the day shown The graph also includes lines for selected earlier years, for comparison Learn more about how to