1. Evaluation of a new methane isotopologue forward model of
C.4
Evaluation of a new methane isotopologue forward model of  
Mingjian Shi and Lee T. Murray
δ13C and δ2H temporal trend
δ13C and δD Distribution
The reasons for methane temporal changes show connection with methane isotopic signature, both δ13C and δ2H.
Therefore, we tend to improve the performance of methane simulation by introduce isotopologue tracers into the model according to the unique isotopic signatures of different sources
Adding in isotopologue tracers 12CH4, 13CH4, CH3D and 14CH4 as well as sperate sources for each of them.
[Whiticar and Schaefer, 2007]