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	   gmd:Hierarchy_Level_Name:  National Ice Center Arctic Sea Ice Charts and Climatologies in Gridded Format
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	      Date:  2014-10-26
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	               gmd:title:  National Ice Center Arctic Sea Ice Charts and Climatologies in Gridded Format
	               gmd:date:  
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	                     gmd:date:  2006
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	                  gmd:Date:  2006-01-01
	               gmd:identifier:  G02172
	               gmd:identifier:  http://dx.doi.org/10.7265/N5X34VDB
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	                              gmd:city:  Boulder
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	                              gmd:city:  Boulder
	                              gmd:administrativeArea:  CO
	                              gmd:postalCode:  80309-0449
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	         gmd:Abstract:  
	
	            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.
	         gmd:Purpose:  Scientific Research
	         gmd:Credit:  National Ice Center. 2006, updated 2009. National Ice Center Arctic Sea Ice Charts and Climatologies in Gridded Format. [indicate subset used]. Compiled by F. Fetterer and C. Fowler. Boulder, Colorado USA: National Snow and Ice Data Center. http://dx.doi.org/10.7265/N5X34VDB. 
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	            gmd:individualName:  Charles Fowler
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	                     gmd:code:  
	                        gco:CharacterString:  SHIPS
	               gmi:description:  
	                  gco:CharacterString:  satellite
	               gmi:instrument:  
	                  gco:CharacterString:  N/A