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Table 3

Derivation of global geo-CH4 emission (Tg yr–1) from geo-ethane emission estimates. DOI: https://doi.org/10.1525/elementa.383.t3

C2/C1 ratioaC1 emissionb (Tg yr–1)Em. fraction

 
Mud volcanoes 0.0007 6.1 0.13 
Gas-oil seeps 0.0182 3.5 0.08 
Submarine seepage 0.0120 0.15 
Microseepage 0.0684 24 0.53 
Geothermal manifestations 0.0130 4.7 0.10 
Total  45.3  
Emission-weighted mean 0.0429   
 C2 emission (Tg yr–1) C1 emission (Tg yr–1)  

 
min Nicewonger et al. (2016) 2.2 29  
max Nicewonger et al. (2016) 3.5 46  
min Dalsøren et al. (2018) 27  
max Dalsøren et al. (2018) 52  
C2/C1 ratioaC1 emissionb (Tg yr–1)Em. fraction

 
Mud volcanoes 0.0007 6.1 0.13 
Gas-oil seeps 0.0182 3.5 0.08 
Submarine seepage 0.0120 0.15 
Microseepage 0.0684 24 0.53 
Geothermal manifestations 0.0130 4.7 0.10 
Total  45.3  
Emission-weighted mean 0.0429   
 C2 emission (Tg yr–1) C1 emission (Tg yr–1)  

 
min Nicewonger et al. (2016) 2.2 29  
max Nicewonger et al. (2016) 3.5 46  
min Dalsøren et al. (2018) 27  
max Dalsøren et al. (2018) 52  

a C2/C1 ratios from Etiope and Ciccioli (2009).

b Emissions from Table 1.

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