G02172 National Ice Center. Compiled by F. Fetterer and C. Fowler. 20060101 Boulder, Colorado USA NSIDC: National Snow and Ice Data Center http://nsidc.org/data/g02172.html http://dx.doi.org/10.7265/N5X34VDB The U.S. National Ice Center (NIC) is an inter-agency sea ice analysis and forecasting center comprised of the Department of Commerce/NOAA, the Department of Defense/U.S. Navy, and the Department of Homeland Security/U.S. Coast Guard components. Since 1972, NIC has produced Arctic and Antarctic sea ice charts. This data set is comprised of Arctic sea ice concentration climatology derived from the NIC weekly or biweekly operational ice-chart time series. The charts used in the climatology are from 1972 through 2007; and the monthly climatology products are median, maximum, minimum, first quartile, and third quartile concentrations, as well as frequency of occurrence of ice at any concentration for the entire period of record as well as for 10-year and 5-year periods. These climatologies and the charts from which they are derived are provided in the 25-km Equal-Area Scalable Earth Grid (EASE-Grid) binary (.bin) format. The climatologies are also available in ArcGIS geodatabases (.mdb), and GIF format browse files (.gif) are also provided. NIC charts are produced through the analyses of available in situ, remote sensing, and model data sources. They are generated primarily for mission planning and safety of navigation. NIC charts generally show more ice than do passive microwave derived sea ice concentrations, particularly in the summer when passive microwave algorithms tend to underestimate ice concentration. The record of sea ice concentration from the NIC series is believed to be more accurate than that from passive microwave sensors, especially from the mid-1990s on (see references at the end of this documentation), but it lacks the consistency of some passive microwave time series. scientific research National Ice Center. Compiled by F. Fetterer and C. Fowler. 20060101 Boulder, Colorado USA NSIDC: National Snow and Ice Data Center http://nsidc.org/data/docs/noaa/g02172_nic_charts_climo_grid/index.html 19720101 20071231 publication date In work Unknown -180 180 90 45 NASA Global Change Master Directory (GCMD) Science Keywords EARTH SCIENCE > Cryosphere > Sea Ice > Sea Ice Concentration EARTH SCIENCE > Oceans > Sea Ice > Sea Ice Concentration None NASA Global Change Master Directory (GCMD) Instrument Keywords AVHRR > Advanced Very High Resolution Radiometer OLS > Operational Linescan System SAR > Synthetic Aperture Radar SCATTEROMETERS SMMR > Scanning Multichannel Microwave Radiometer SSM/I > Special Sensor Microwave/Imager VISUAL OBSERVATIONS NASA Global Change Master Directory (GCMD) Platform Keywords AIRCRAFT DMSP > Defense Meteorological Satellite Program MODELS NIMBUS-7 NOAA POES > NOAA Polar Orbiting Environmental Satellites SATELLITES SHIPS ISO 19115 Topic Categories environment oceans None Arctic Sea Ice Sea Ice Sea Ice Concentration Sea Ice Stage Of Development Sea Ice Variability NASA Global Change Master Directory (GCMD) Location Keywords Geographic Region > Arctic Ocean > Arctic Ocean 2 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 > Oceans > Sea Ice > Sea Ice Concentration None None NSIDC User Services National Snow and Ice Data Center mailing

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Boulder CO 80309-0449 USA 1 303 492-6199 1 303 492-2468 nsidc@nsidc.org G02172 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. Binary ftp://sidads.colorado.edu/pub/DATASETS/NOAA/G02172/ None 20130312 20130312 NSIDC User Services National Snow and Ice Data Center mailing

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Boulder CO 80309-0449 USA 1 303 492-6199 1 303 492-2468 nsidc@nsidc.org FGDC Content Standard for Digital Geospatial Metadata: Extensions for Remote Sensing Metadata FGDC-STD-012-2002