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	      Date:  2014-08-27
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	               gmd:title:  Greenland Ice Sheet Melt Characteristics Derived from Passive Microwave Data
	               gmd:date:  
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	                     gmd:date:  2008
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	                              gmd:deliveryPoint:  National Snow and Ice Data Center
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	         gmd:Abstract:  
	
	            The Greenland ice sheet melt extent data, acquired as part of the NASA Program 
	            for Arctic Regional Climate Assessment (PARCA), is a daily (or every other 
	            day, prior to August 1987) estimate of the spatial extent of wet snow on the 
	            Greenland ice sheet since 1979. It is derived from passive microwave satellite 
	            brightness temperature characteristics using the Cross-Polarized Gradient 
	            Ratio (XPGR) of Abdalati and Steffen (1997). It is physically based on the 
	            changes in microwave emission characteristics observable in data from the 
	            Scanning Multi-channel Microwave Radiometer (SMMR) and the Special Sensor 
	            Microwave/Imager (SSM/I) instruments when surface snow melts. It is not a 
	            direct measure of the snow wetness but rather is a binary indicator of the 
	            state of melt of each SMMR and SSM/I pixel on the ice sheet for each day of 
	            observation. It is, however, a useful proxy for the amount of melt that occurs 
	            on the Greenland ice sheet. The data are provided in a variety of formats 
	            including raw data in ASCII format, gridded daily data in binary format, and 
	            annual and complete time series climatologies in gridded binary and GeoTIFF 
	            format. All data are in a 60 x 109 pixel subset of the standard Northern 
	            Hemisphere polar stereographic grid with a 25 km resolution and are available 
	            via FTP.
	         gmd:Purpose:  Scientific Research
	         gmd:Credit:  Waleed Abdalati. 2008. Greenland Ice Sheet Melt Characteristics Derived from Passive Microwave Data. [indicate subset used]. Boulder, Colorado USA: National Snow and Ice Data Center. 
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	            gmd:keyword:  Continent > North America > Greenland
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	            gmd:keyword:  EARTH SCIENCE > Cryosphere > Snow/Ice > Snow Melt
	            gmd:keyword:  EARTH SCIENCE > Cryosphere > Snow/Ice > Snow Melt
	            gmd:keyword:  EARTH SCIENCE > Terrestrial Hydrosphere > Snow/Ice > Snow Melt
	            gmd:keyword:  EARTH SCIENCE > Terrestrial Hydrosphere > Snow/Ice > Snow Melt
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