Table 1 CH4 and CO2 fluxes released to the atmosphere from the four Lusi degassing systems (two vents in the crater zone, miniseepage, fractured zones and satellite seeps) estimated by ground-based measurements.
From: Relevant methane emission to the atmosphere from a geological gas manifestation
Seepage mode | N. data | ϕCH4 (tonnes year−1) | ϕCO2 (tonnes year−1) | ϕCH4 (tonnes km−2 year−1) | ϕCO2 (tonnes km−2 year−1) | Area (km2) |
|---|---|---|---|---|---|---|
Vent1 LOW | 26,350 | 212,822 | ||||
Vent1 MEAN | 205a | 42,040 | 339,551 | |||
Vent1 MAX | 61,372 | 495,690 | ||||
Vent2 LOW | 13,660 | 110,327 | ||||
Vent2 MEAN | 21,794 | 176,023 | ||||
Vent2 MAX | 31,815 | 256,965 | ||||
Miniseepage LOW | 346 | 471 | 59 | 80 | ||
Miniseepage MEAN | 175 | 774 | 734 | 131 | 124 | 5.91 |
Miniseepage MAX | 2047 | 1752 | 346 | 296 | ||
Fractured zones LOW | 15 | 5595 | 12 | 4176 | ||
Fractured zones MEAN | 129 | 1573 | 17,484 | 1174 | 13,047 | 1.34 |
Fractured zones MAX | 7022 | 36,586 | 5240 | 27,303 | ||
Satellite seeps | 351 | 35,960 | 5325 | |||
Total excluding crater zone | 38,307 | 23,543 | ||||
Total LOW | 78,316 | 346,692 | 10,802 | 47,820 | ||
Total MEAN | 102,141 | 539,117 | 14,088 | 74,361 | 7.25 | |
Total MAX | 131,494 | 776,198 | 18,137 | 107,062 | ||
TROPOMI LOW | 53,000 | |||||
TROPOMI MEAN | 140,000 | |||||
TROPOMI MAX | 227,000 |
