Sulfur Reservoirs

Question 0

The greatest fluxes between reservoirs occurs between the

Answer 0

Atmosphere, biosphere and hydrosphere.

Question 1

Ocean sulfur has a residence time of

Answer 1

50 million years.

Question 2

Seawater reservoir -

Answer 2

1200 x 10^12 g S

Question 3

Evaporite rock reservoir -

Answer 3

2500 x 10^6 g S

Question 4

Shale rocks reservoir -

Answer 4

5000 x 10^6 g S

Question 5

Geosphere ➡️ Atmosphere

Answer 5

Reduces sulfur, released by weathering and erosion, produces sulfate SO4 2- upon contact with air.

Question 6

Atmosphere ➡️ Biosphere (3)

Answer 6

Animals consume organisms and the reduced sulfur within them.

Upon death, tissues decompose, some sulfur enters the cells of microbes, some is released as sulfate.

Sulfate can be directly assimilated by plants and microbes.

Question 7

Geosphere ➡️ Atmosphere ➡️ Hydrosphere

Answer 7

Volcanic eruption; sulfur enters the atmosphere and eventually is deposited into the oceans.

Question 8

Hydrosphere ➡️ Atmosphere

Answer 8

Sulfate is consumed by marine organisms and marine algae, produces demethyl sulfide (CH3)2S.

This is the largest gas flux of sulfur to the atmosphere.

Question 9

Biosphere ➡️ Hydrosphere (2)

Answer 9

Sulfur goes into rivers and streams and eventually reaches the ocean.

Sulfate can be reduced to H2S or S by sulfate reducing bacteria, present in oxygen poor environments and lakes.

Question 10

Major Biogenic gas produced on land:

Answer 10

H2S

Question 11

Major Biogenic gas produced in ocean:

Answer 11

Dimethyl sulfate (CH3)2S - Has a significant effect on the climate.