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i List	  of	  Tables iii List	  of	  Figures iv I.	  Introduction/Background 1 I.2	  	  Isotopic	  analysis 4 I.3	  	  Isotopic	  signatures	  of	  CH4	  Sources 6 I.4	  	  CH4	  sinks	  and	  their	  isotopic	  effects 10 I.5	  	  Conventional	  isotopic	  analysis 12 I.6	  	  Spectroscopic	  techniques	  for	  isotopic	  analysis 13 I.7	  	  Motivation 20 II.	  Methods 22 II.1	  Experimental	  approach 22 II.2	  Experimental	  setup 25 II.3	  Obtaining	  absorption	  spectra 30 II.4	  Isotope	  ratio	  sample	  generation 36 II.5	  Frequency	  calibrations 39 II.6	  CH4	  concentration	  determination 41 III.	  Results	  and	  discussion 44 III.1	  Interference	  of	  other	  molecules 49 III.2	  Temperature	  Dependence 50 IV.	  Conclusion 53 V.	  References 54

Development of a Portable Cavity Ring-Down Spectroscopic Technique for Measuring Stable Isotopes in Atmospheric Methane