|
Region
|
Evasion (average)
(Mg year−1)
|
Ratioa
(%)
|
|---|
|
Forest
|
342
|
7,5
|
|
Tundra/grassland/savannah/prairie/chaparral
|
448
|
9,9
|
|
Desert/metalliferous/non-vegetated zones
|
546
|
12,0
|
|
Agricultural areas
|
128
|
2,8
|
|
Evasion after mercury depletion eventsb
|
200
|
4,4
|
|
Total
|
1664
|
–
|
|
Volcanoes and geothermal areas
|
90
|
–
|
|
Biomass burning
|
675
|
–
|
- aCalculated over the total evasion from natural sources which sum 4532 Mg year−1
- bFriedli [42] and Mason [68] distinguish as a natural source of mercury emission to the atmospheric air of regions where there are episodes of sudden decreases in mercury concentrations in the air by deposition to the ground and then reemission. These phenomena occur mainly in the Arctic regions and Antarctica, and the emission from this source is estimated at 200 Mg year−1
