480
Chemical Oceanography, 4th Edition
Skei, 1985) and 15.3 μM (Haraldsson and Westerlund, 1988). Our higher value might be
due to the better sampling resolution with the submersible pumping system. It might also
reflect the continuing accumulation of Mn in the transition zone. The concentrations of
dissolved Mn decreased rapidly below the maximum peak at 21 m and reached nearly
constant values (less than 1 μM) below 100 m.
The concentrations of dissolved Fe started increasing just below the O 2 –H 2 S interface
(Figure  10.73) to a sharp maximum at 21 m. The maximum value found in this study,
2.85 μM, is higher than earlier values of 2.0 μM (Haraldsson and Westerlund, 1988).
Again, these differences could be caused by various sampling depths or fluctuation of
160
Framvaren
0
2
Scale
4 km
Lyngdalssord
Helvikkord
Sill
S
N
Depth (m)
H 2 S
120
80
40
0
Figure 10.67
A longitudinal profile of the Framvaren Fjord.
8
12
16
20
0
20
40
60
80
100
120
140
160
180
12
16
20
24
28
Temperature (°C), σ t
Salinity
Depth (m)
Temp.
Salinity
σ t
Figure 10.68
Profile of salinity, temperature, and sigma-t in the Framvaren Fjord.