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Table 1.

Estimated natural geologic methane emissions from recent studies that used ice core 14C-CH4 measurements compared with recent bottom-up estimates. DOI: https://doi.org/10.1525/elementa.2020.00066.t1

StudyStudy TypeEstimated Geologic Emissions (Tg CH4 yr–1)
Petrenko et al. (2017)  Top-down ice core 14C (last deglaciation) <15.4 
Hmiel et al. (2020)  Top-down ice core 14C (preindustrial, early industrial) <5.4 
Dyonisius et al. (2020)  Top-down ice core 14C (last deglaciation, early Holocene) <19 
Etiope (2015)  Bottom-up 45–76 (median 60) 
Etiope et al. (2019)  Bottom-up 42.8–49.8 
StudyStudy TypeEstimated Geologic Emissions (Tg CH4 yr–1)
Petrenko et al. (2017)  Top-down ice core 14C (last deglaciation) <15.4 
Hmiel et al. (2020)  Top-down ice core 14C (preindustrial, early industrial) <5.4 
Dyonisius et al. (2020)  Top-down ice core 14C (last deglaciation, early Holocene) <19 
Etiope (2015)  Bottom-up 45–76 (median 60) 
Etiope et al. (2019)  Bottom-up 42.8–49.8 
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