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Table 5.

Measured average CH4 flux values compared to corresponding emission level estimates in Etiope et al. (2019). DOI: https://doi.org/10.1525/elementa.2020.00066.t5

Sampling Area(s) KeyNumber of SamplesAssigned Seepage Level in Etiope et al. (2019) Average Measured Flux (mg CH4 m–2 day–1) aEstimated Microseepage (mg CH4 m–2 day–1) in Etiope et al. (2019) 
Level 0/Level 1 –1.81 ± 0.608 0.598 
Level 0/Level 1 –0.989 ± 0.820 0.598 
Level 0/Level 1 –0.482 ± 0.303 0.598 
a, b, c average 16 Level 0/Level 1 –1.10 ± 0.337 0.598 
Level 2 –1.11 ± 0.541 31.1 
Level 2 –0.306 ± 0.129 31.1 
Level 2 –0.433 ± 0.439 31.1 
Level 2 –0.448 ± 0.244 31.1 
Level 2 –0.00763 ± 0.069 31.1 
d, g, h, i, j average 19 Level 2 –0.484 ± 0.164 31.1 
Level 4 –0.305 ± 0.181 493.54 
Level 4 –0.0242 ± 0.0151 493.54 
e, f average Level 4 –0.212 ± 0.126 493.54 
Sampling Area(s) KeyNumber of SamplesAssigned Seepage Level in Etiope et al. (2019) Average Measured Flux (mg CH4 m–2 day–1) aEstimated Microseepage (mg CH4 m–2 day–1) in Etiope et al. (2019) 
Level 0/Level 1 –1.81 ± 0.608 0.598 
Level 0/Level 1 –0.989 ± 0.820 0.598 
Level 0/Level 1 –0.482 ± 0.303 0.598 
a, b, c average 16 Level 0/Level 1 –1.10 ± 0.337 0.598 
Level 2 –1.11 ± 0.541 31.1 
Level 2 –0.306 ± 0.129 31.1 
Level 2 –0.433 ± 0.439 31.1 
Level 2 –0.448 ± 0.244 31.1 
Level 2 –0.00763 ± 0.069 31.1 
d, g, h, i, j average 19 Level 2 –0.484 ± 0.164 31.1 
Level 4 –0.305 ± 0.181 493.54 
Level 4 –0.0242 ± 0.0151 493.54 
e, f average Level 4 –0.212 ± 0.126 493.54 

aUncertainties represent the standard error of the mean.

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