An Introduction to Environmental Chemistry

10 10

72

Water

weathering

River runoff

104

32

10

Volcanic

emission

Volcanic

emission

Aeolian

emission

Sea-salt

sulphate

Volatile sulphur

emission from

oceans

Volatile sulphur

emission from

continents

Net flow 10

Deposition

over oceans

22

144

43

207

Deposition

over continents

(a)

Fig. 7.17Simplified version of the sulphur cycle (after Brimblecombe et al.1989). (a) Sulphur cycle as it is
thought to have been prior to any major anthropogenic influence. (b) Sulphur cycle as it was in the mid-1980s.
Units for inter-reservoir flows are in Tg S yr-^1 (i.e. 10^12 gSyr-^1 ). With permission from the Scientific
Community on Problems of the Environment—SCOPE, John Wiley & Sons Ltd.

20 10

72

Water

weathering

River runoff

213

29

Waste

waters

28

Fertilization

84

10

Volcanic

emission

Volcanic

emission

Aeolian

emission

Sea-salt

sulphate

Volatile sulphur

emission from

Volatile sulphur oceans

emission from

Consumption continents

from

lithosphere

Anthropogenic

emission

Net flow 61

Deposition

over oceans

22

93

150

144

43

258

Deposition

over continents

(b)