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	      Date:  2014-10-25
	   gmd:Metadata_Standard_Name:  ISO 19115 Geographic Information - Metadata First Edition
	   gmd:Metadata_Standard_Version:  ISO 19115:2003
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	         gmd:citation:  
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	               gmd:title:  Sea Ice Index
	               gmd:date:  
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	                     gmd:date:  2002
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	                  gmd:Date:  2002-12-05
	               gmd:identifier:  G02135
	               gmd:identifier:  http://dx.doi.org/10.7265/N5QJ7F7W
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	                     gmd:individualName:  NOAA User Services
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	                              gmd:deliveryPoint:  National Snow and Ice Data Center
	                              gmd:city:  Boulder
	                              gmd:administrativeArea:  CO
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	         gmd:Abstract:  
	
	            The Sea Ice Index provides a quick look at Arctic- and Antarctic-wide changes 
	            in sea ice. It is a source for consistent, up-to-date sea ice extent and 
	            concentration images and data values from November 1978 to the present.

Sea 
	            Ice Index images depict ice cover and trends in ice cover in the Arctic and 
	            Antarctic oceans. Sea Ice Index data files tabulate ice extent in numbers. The 
	            images and data are produced in a consistent way that makes the Index 
	            time-series appropriate for use when looking at long-term trends in sea ice 
	            cover. Both monthly and daily products are available. However, monthly 
	            products are better to use for long-term trend analysis because errors in the 
	            daily product tend to be averaged out in the monthly product and because 
	            day-to-day variations are often the result of short-term weather. 

Monthly 
	            images show sea ice extent with an outline of the median extent for that month 
	            for comparison. Other monthly images show sea ice concentration as well as 
	            trends in concentration for that month. Monthly extent products are also 
	            available as geographic information systems (GIS) compatible shapefiles. Plain 
	            ASCII text data files contain monthly mean extent and area, in millions of 
	            square kilometers, by year. These monthly extent numbers are used for graphs 
	            of extent anomalies with trend lines and significance intervals. Anomalies and 
	            median extent are calculated using a 30-year reference period of 1981 through 
	            2010.

Daily images show sea ice extent, with an outline of the median extent 
	            for that day for comparison, and sea ice concentration. Plain ASCII text data 
	            files contain daily extent, in millions of square kilometers, for almost every 
	            day from 1978 onward. These daily extent numbers are used for graphs of daily 
	            extent over the last four months.
	         gmd:Purpose:  Scientific Research
	         gmd:Credit:  Fetterer, F., K. Knowles, W. Meier, and M. Savoie. 2002, updated daily. Sea Ice Index. [indicate subset used]. Boulder, Colorado USA: National Snow and Ice Data Center. http://dx.doi.org/10.7265/N5QJ7F7W. 
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	            gmd:individualName:  Kenneth Knowles
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	            gmd:keyword:  Geographic Region > Arctic
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	                     gmd:code:  
	                        gco:CharacterString:  SATELLITES
	               gmi:description:  
	                  gco:CharacterString:  satellite
	               gmi:instrument:  
	                  gco:CharacterString:  N/A