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. 2016 Sep 17;31(4):369–377. doi: 10.1264/jsme2.ME16087

Fig. 2.

Fig. 2

Vertical profiles of temperature and chemical and isotopic compositions of soil gases collected from the surface downwards to a depth of 2.5 m [modified from Capaccioni et al. (6)]. A) Vertical profile of the isotopic composition of CH4 and CO2; 13C/12C-CO2 and 13C/12C-CH4 values are expressed as δ13C-CO2 VPDB (Vienna Pee Dee Belemnite) ‰ and δ13C-CO2 PDB ‰, respectively. B) Vertical profile of temperatures measured with depth using a digital thermometer, C) and D) Vertical profiles of O2/N2 and CO2/CH4 flux ratios measured during piezometer drilling.