481
Processes in the Oceans
Present situation
Permanent anoxic ord
Meromictic lake
Old seawater
H 2 S
H 2 S
O 2
Seawater
O 2
Seawater
O 2
Lake water
Seawater
H 2 S
H 2 S
O 2
Old seawater
Framvaren
from past to present
Framvaren
from past to present
Framvaren
from past to present
Framvaren
from past to present
Dredging of sill (1850)
Oxic ord
(8–10,000 yrs. B.P.)
Figure 10.69
The historical development of the Framvaren Fjord.
0
50
100
150
200
250
300
350
0
2
4
6
8
0
20
40
60
80
100
120
140
160
180
O 2 (µM)
H 2 S (mM)
Depth (m)
Oxygen
Sulfide
Figure 10.70
Profiles of oxygen and hydrogen sulfide in the Framvaren Fjord.