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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
World Glacier Inventory - NSIDC Glacier Parameters Search Search by geographic cooridnates (lat lon), altitude size length, data contributor, and glacier features such as primary class, form, frontal characteristic, longitudinal profile, major source of nourishment, and tongue activity Geographic Coordinates If no latitude or longitude is specified, the search defaults to the full geographical range Enter values in decimal
GLIMS - National Snow and Ice Data Center This data collection’s primary data product is the GLIMS Glacier Database The glacier database includes measurements of glacier geometry, glacier area, snowlines, supraglacial lakes and rock debris, and other glacial attributes, as well as browse images
Ice Shelves - National Snow and Ice Data Center The height of the Antarctica's largest ice shelf, the Ross Ice Shelf, looms in the background with sea ice spreading in front — Credit: National Oceanic and Atmospheric Administration (NOAA) How do ice shelves form? Glaciers flow under their own weight out to a coastline and onto the ocean surface, pushing and feeding an ice shelf Snow falls on a glacier, adding mass to the glacier, which
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