org.nsidc:NSIDC-0050 National Snow and Ice Data Center (NSIDC) Unknown Boulder, CO U.S.A. National Snow and Ice Data Center (NSIDC) http://nsidc.org/data/nsidc-0050.html These gridded ice charts represent a reformatting of information contained in another data set, the Russian Arctic and Antarctic Research Institute's (AARI) 10 Day Digital Arctic Sea Ice Charts. AARI digitized Arctic sea ice concentration and stage of development charts as part of an international data exchange program. The AARI source charts, similar to operational charts distributed by the National Ice Center describing ice type and constitution, were developed from aircraft and satellite observations for shipping purposes, and provide extremely detailed information. Such data are particularly valued in process studies tracking the growth and recession of polynyas, or for looking at the preponderance of ice at certain stages of development in a particular area. NSIDC does not maintain the operational charts, but archives the AARI digitized version. However, the Arctic and Antarctic Research Institute (AARI) 10 Day Digital Arctic Sea Ice Charts were encoded in SIGRID (Sea Ice Grid) format, which assigns numerical values to ice parameters and records them at specific lat/lon grid points. But due to the difficulties of visualizing, extracting and working with data in SIGRID, NSIDC is now providing AARI data in NSIDC's Equal Area SSM/I Earth Grid. The EASE-Grid format makes it especially easy to compare observed ice concentrations or ice types with the same parameters derived from satellite data (such as ice concentrations from passive microwave sensors). AARI sea ice data in the EASE-Grid projection are gridded at a 12.5 km resolution, for both Western (24W to 110E) and Eastern (105E to 130W) sectors . Data extend from 1953 through 1990, and are available via ftp in compressed tar format. Postscript (.ps) files depicting coverage per year are also provided with the data. scientific research National Snow and Ice Data Center (NSIDC) Unknown Boulder, CO U.S.A. National Snow and Ice Data Center (NSIDC) http://nsidc.org/data/docs/daac/nsidc0050_aari_ease_seaice.gd.html 19530101 19901230 publication date Complete Unknown -130 110 90 45 NASA Global Change Master Directory (GCMD) Science Keywords EARTH SCIENCE > Cryosphere > Sea Ice > Ice Extent EARTH SCIENCE > Cryosphere > Sea Ice > Ice Growth/Melt EARTH SCIENCE > Cryosphere > Sea Ice > Ice Types EARTH SCIENCE > Cryosphere > Sea Ice > Sea Ice Age EARTH SCIENCE > Cryosphere > Sea Ice > Sea Ice Concentration EARTH SCIENCE > Cryosphere > Snow/Ice > Ice Extent EARTH SCIENCE > Oceans > Sea Ice > Ice Extent EARTH SCIENCE > Oceans > Sea Ice > Ice Types EARTH SCIENCE > Oceans > Sea Ice > Polynyas EARTH SCIENCE > Oceans > Sea Ice > Sea Ice Age EARTH SCIENCE > Terrestrial Hydrosphere > Snow/Ice > Ice Extent NASA Global Change Master Directory (GCMD) Project Keywords EOSDIS > Earth Observing System Data Information System ESIP > Earth Science Information Partners Program NASA Global Change Master Directory (GCMD) Instrument Keywords DIGITIZER ISO 19115 Topic Categories climatologyMeteorologyAtmosphere oceans None Arctic ICE CHARTS Ice Form North Polar Basin Sea Ice Concentration Sea Ice Extent Sea Ice Form Sea Ice Stage Of Development Stage Of Development NASA Global Change Master Directory (GCMD) Location Keywords Ocean > Arctic Ocean > Barents Sea Ocean > Arctic Ocean > Beaufort Sea Ocean > Arctic Ocean > Chukchi Sea Ocean > Atlantic Ocean > North Atlantic Ocean Ocean > Atlantic Ocean > North Atlantic Ocean > Greenland Sea Ocean > Pacific Ocean > North Pacific Ocean > Bering Sea 11 NASA Global Change Master Directory (GCMD) Science Keywords EARTH SCIENCE > Cryosphere > Sea Ice > Ice Extent NASA Global Change Master Directory (GCMD) Science Keywords EARTH SCIENCE > Cryosphere > Sea Ice > Ice Growth/Melt NASA Global Change Master Directory (GCMD) Science Keywords EARTH SCIENCE > Cryosphere > Sea Ice > Ice Types NASA Global Change Master Directory (GCMD) Science Keywords EARTH SCIENCE > Cryosphere > Sea Ice > Sea Ice Age NASA Global Change Master Directory (GCMD) Science Keywords EARTH SCIENCE > Cryosphere > Sea Ice > Sea Ice Concentration NASA Global Change Master Directory (GCMD) Science Keywords EARTH SCIENCE > Cryosphere > Snow/Ice > Ice Extent NASA Global Change Master Directory (GCMD) Science Keywords EARTH SCIENCE > Oceans > Sea Ice > Ice Extent NASA Global Change Master Directory (GCMD) Science Keywords EARTH SCIENCE > Oceans > Sea Ice > Ice Types NASA Global Change Master Directory (GCMD) Science Keywords EARTH SCIENCE > Oceans > Sea Ice > Polynyas NASA Global Change Master Directory (GCMD) Science Keywords EARTH SCIENCE > Oceans > Sea Ice > Sea Ice Age NASA Global Change Master Directory (GCMD) Science Keywords EARTH SCIENCE > Terrestrial Hydrosphere > Snow/Ice > Ice Extent These data are freely available to the public. None. NSIDC USER SERVICES mailing

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Boulder CO 80309-0449 USA +1 (303) 492-6199 +1 (303) 492-2468 nsidc@nsidc.org NSIDC-0050 NSIDC cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NSIDC makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty. compressed tar ftp://sidads.colorado.edu/pub/DATASETS/NOAA/G02119/ free 20070822 20011004 NSIDC NOAA USER SERVICES National Oceanic and Atmospheric Administration mailing

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