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homepage national snow and ice data center menu national snow and ice data center nsidc a part of cires at the university of colorado boulder skip to main content main navigation news analyses news stories scientific analyses about our analyses arctic sea ice news analysis asina ice sheets today snow today multimedia data explore data visualize data submit data submit nasa data to nsidc daac submit data to other nsidc programs user resources get started with data data announcements help center data tools documents levels of service nasa earthdata forum data programs about our programs nasa national snow and ice data center distributed active archive center nsidc daac noaa at nsidc exchange for observations and local knowledge of the arctic eloka data policies our research learn what is the cryosphere parts of the cryosphere arctic weather climate frozen ground permafrost glaciers ice sheets ice shelves sea ice snow ask a scientist cryosphere glossary about about nsidc what we do our people published research our history diversity equity inclusion careers for the media contact us citation policies web policy land acknowledgement search news analyses news stories scientific analyses about our analyses arctic sea ice news analysis asina ice sheets today snow today multimedia data explore data visualize data submit data submit nasa data to nsidc daac submit data to other nsidc programs user resources get started with data data announcements help center data tools documents levels of service nasa earthdata forum data programs about our programs nasa national snow and ice data center distributed active archive center nsidc daac noaa at nsidc exchange for observations and local knowledge of the arctic eloka data policies our research learn what is the cryosphere parts of the cryosphere arctic weather climate frozen ground permafrost glaciers ice sheets ice shelves sea ice snow ask a scientist cryosphere glossary about about nsidc what we do our people published research our history diversity equity inclusion careers for the media contact us citation policies web policy land acknowledgement welcome to the national snow and ice data center explore data our research advancing knowledge of earth s frozen regions since 1976 frozen ground frozen ground glaciers glaciers ice shelves ice sheets ice shelves sea ice sea ice snow snow soil moisture soil moisture close frozen ground when the temperature of the ground drops below 0 celsius 32 fahrenheit it becomes frozen ground permafrost is a permanently frozen layer below earth s surface it consists of soil gravel and sand usually bound together by ice explore frozen ground data learn more about frozen ground browse related data collections aquarius measures soil moisture active passive data smap browse related research projects qgreenland project close glaciers glaciers are huge masses of ice snow rock sediment and often liquid water that originate on land and move down slope under the influence of their own weight and gravity the two main types are continental glaciers or ice sheets and alpine glaciers explore glaciers data learn more about glaciers browse related data collections nasa earthdata cloud glims global land ice measurements from space high mountain asia hma operation icebridge icesat glas icesat 2 measures browse related research projects international thwaites glacier collaboration close ice sheets ice sheets are masses of glacial land ice extending more than 50 000 square kilometers 20 000 square miles there are only two ice sheets worldwide today the antarctic and greenland ice sheets they contain more than 99 percent of the land ice on earth explore ice sheets data learn more about ice sheets browse related data collections nasa earthdata cloud glims global land ice measurements from space operation icebridge icesat glas icesat 2 measures browse related research projects qgreenland project close ice shelves an ice shelf is a large floating platform of ice that forms where a glacier or ice sheet flows down to a coastline and onto the ocean surface ice shelves play an important role in slowing the flow of ice from glaciers or ice sheets into the ocean when ice shelves collapse research has shown that glaciers accelerate flowing into the ocean and adding to sea level rise explore ice shelves data learn more about ice shelves browse related data collections nasa earthdata cloud glims global land ice measurements from space operation icebridge icesat glas icesat 2 measures close sea ice sea ice is frozen seawater that floats on the surface of polar oceans and seas it grows during each hemisphere s winter and it retreats in the summer but does not completely disappear the highly reflective white surface of sea ice reflects solar energy cooling the planet when it melts the darker ocean absorbs more heat reinforcing the cycle of melting sea ice explore sea ice data learn more about sea ice browse related data collections arctic ice dynamics joint experiment aidjex amsr e amsr unified nasa earthdata cloud environmental working group arctic atlases ewg operation icebridge icesat glas icesat 2 measures modis nimbus data rescue project smmr and ssm i ssmis viirs browse related research projects sea ice prediction network silalirijiit project arctic sea ice news analysis close snow snow is composed of frozen water crystals it is not frozen rain but a crystallization of ice that typically forms in clouds highly reflective white snow bounces solar energy back into space instead of warming the planet mountain snowpacks also provide a slow release of fresh water into rivers and waterways explore snow data learn more about snow browse related data collections arctic ice dynamics joint experiment aidjex amsr e amsr unified airborne snow observatory aso cold land processes field experiment clpx nasa earthdata cloud environmental working group arctic atlases ewg glims global land ice measurements from space high mountain asia hma operation icebridge measures modis smmr and ssm i ssmis nasa snowex viirs browse related research projects silalirijiit project arctic rain on snow study project close soil moisture soil moisture is the water content of soil and is key to earth s terrestrial water carbon and water cycles it also influences how and when the soil may freeze or thaw a key component of understanding frozen ground and its extent explore soil moisture data browse related data collections amsr e amsr unified aquarius cold land processes field experiment clpx soil moisture active passive data smap smmr and ssm i ssmis stay current with our expert analyses arctic sea ice news analysis asina near real time data and monthly analysis on how arctic and antarctic sea ice is changing and what conditions may be playing a role read more ice sheets today near real time melt maps graphs and periodic analyses during the greenland ice sheet melt season and periodic data images and analyses during the antarctic ice sheet melt season read more snow today monthly analyses and daily data images of snow conditions in near real time across the western us using a combination of satellite data and surface observations read more arctic sea ice news and analysis march 25 2024 arctic sea ice reaches a below average maximum arctic sea ice has likely reached its maximum extent for the year at 15 01 million square kilometers 5 80 million square miles on march 14 the 2024 maximum is the fourteenth lowest in the 46 year satellite record overview of conditions on continue reading read more featured news stories image feature story the story behind the storymap a family s tale of a rain on snow event image ask a scientist what is the karakoram anomaly image spotlight quickening progress of qgreenland image feature story quenching the arid west with record snowfall the tools behind snow data image spotlight openaltimetry elevates data access see more data research analysis updates march 25 2024 arctic sea ice reaches maximum extent for 2024 arctic sea ice has likely reached its maximum extent for the year at 15 01 million square kilometers 5 80 million square miles on march 14 according to scientists at the national snow and ice data center nsidc at the university of colorado boulder the 2024 maximum is the fourteenth lowest in the 46 year satellite record read more march 19 2024 data set update noaa nsidc climate data record of passive microwave sea ice concentration version 4 noaa nsidc is pleased to announce that the climate data record of passive microwave sea ice concentration version 4 data set accessible through the national snow and ice data center nsidc has read more march 6 2024 user notice visible infrared imaging radiometer suite viirs version 1 collection 1 to cease forward processing visible infrared imaging radiometer suite viirs version 1 collection 1 snow and sea ice data sets will cease forward processing on june 30 2024 the version 1 data will remain available for read more march 5 2024 new data set release snowex23 laser snow microstructure specific surface area snow off data version 1 the snowex23 laser snow microstructure specific surface area snow off data version 1 data set is now available at the nasa national snow and ice data center distributed active archive center nsidc read more march 5 2024 data set update bootstrap sea ice concentrations from nimbus 7 smmr and dmsp ssm i ssmis version 4 the bootstrap sea ice concentrations from nimbus 7 smmr and dmsp ssm i ssmis version 4 data set accessible through the nasa national snow and ice data center distributed active archive center nsidc read more march 5 2024 data set retirement v4 atlas icesat 2 l3b weekly monthly gridded atmosphere data sets retiring the atlas icesat 2 l3b weekly gridded atmosphere atl16 and atlas icesat 2 l3b monthly gridded atmosphere atl17 version 4 data sets will be retired from the nasa national snow and ice data center read more see all data updates alerts data management programs at nsidc nasa national snow and ice data center distributed active archive center nsidc daac open access cryosphere and related geophysical data from nasa earth observing satellite missions airborne campaigns and field observations explore nasa data at nsidc national oceanic and atmospheric administration noaa at nsidc a noaa funded program providing open access data from satellites field instruments weather stations historical records and rescued data explore noaa data at nsidc exchange for local observations and knowledge of the arctic eloka data curation for indigenous communities working with indigenous communities in the arctic to preserve and promote their data and knowledge for use in scientific studies explore eloka data at nsidc subscribe to our newsletter follow us facebook flickr youtube twitter footer for the public news stories learn about snow ice current conditions analyses featured research careers for the media educators students current conditions analyses explore data help center our research most popular snow ice the cryosphere sea ice index arctic sea ice news analysis ice sheets today data analyses snow today data analyses explore data for researchers explore data citation policies nsidc research our scientists submit data for the public news stories learn about snow ice current conditions analyses featured research careers for the media educators students current conditions analyses explore data help center our research most popular snow ice the cryosphere sea ice index arctic sea ice news analysis ice sheets today data analyses snow today data analyses explore data for researchers explore data citation policies nsidc research our scientists submit data icon worlddatasystem icon cires icon colorado university icon nasa 2024 national snow and ice data center advancing knowledge of earth s frozen regions news analyses news stories scientific analyses about our analyses arctic sea ice news analysis asina ice sheets today snow today multimedia data explore data visualize data submit data submit nasa data to nsidc daac submit data to other nsidc programs user resources get started with data data announcements help center data tools documents levels of service nasa earthdata forum data programs about our programs nasa national snow and ice data center distributed active archive center nsidc daac noaa at nsidc exchange for observations and local knowledge of the arctic eloka data policies our research learn what is the cryosphere parts of the cryosphere arctic weather climate frozen ground permafrost glaciers ice sheets ice shelves sea ice snow ask a scientist cryosphere glossary about about nsidc what we do our people published research our history diversity equity inclusion careers for the media contact us citation policies web policy land acknowledgement
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