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	   gmd:Hierarchy_Level_Name:  Methane Isotopes in South Pole Firn Air, 2008
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	               gmd:title:  Methane Isotopes in South Pole Firn Air, 2008
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	                     gmd:date:  2011
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	                  gmd:Date:  2011-01-01
	               gmd:identifier:  NSIDC-0502
	               gmd:identifier:  http://dx.doi.org/10.7265/N55T3HFP
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	         gmd:Abstract:  
	
	            This data set contains depth profiles for delta carbon-13 (δ13C) and 
	            delta deuterium (δD) of methane (CH4) in South Pole firn air. 
	            The investigators obtained air samples from two boreholes during December 2008 
	            and January 2009, and subsequently determined isotope ratios at 18 depths. The 
	            profiles represent a roughly 100-year history of the isotopic composition of 
	            CH4 at South Pole Station (no depth-age model provided).

Data are 
	            available via FTP as an ASCII text file (.txt) and a Microsoft Excel file 
	            (.xlsx).
	         gmd:Purpose:  Scientific Research
	         gmd:Credit:  Sowers, T. 2011. Methane Isotopes in South Pole Firn Air, 2008. [indicate subset used]. Boulder, Colorado USA: National Snow and Ice Data Center. http://dx.doi.org/10.7265/N55T3HFP. 
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	            gmd:individualName:  Todd A. Sowers
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	            gmd:keyword:  Carbon
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	            gmd:keyword:  delta 13C
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