Baltic Sea

θ ( o C)
S
Depth (m)
50
100
150
200
SW
3
2.5
5.8
6 5.8
5.8
16
6
6.2
3
5.4
6.2
6
6
2.5
14.5
5.2 5.2
5.6
2.5
5.4 5.6
5.6
NE
5.8
15
10
5
50
100
150
200
SW
6.4
8.2
10.8
12
12.2
12.4
7.4
8.2
12.5
10.6
11.8
NE
12
11
10
9
8
7
19.6 19.8 20 20.2 20.4
19.6 19.8 20 20.2 20.4
σ t
(kg m −3 )
O 2
(ml/l)
Depth (m)
50
100
150
200
SW
4
6
6.5
8
8.7
9.1
9.2
9.6
9.7
9.8
9.9
5.5
NE
19.6 19.8 20 20.2 20.4
Longitude ( o E)
9
8
7
6
5
4
50
100
150
200
0.6
0.2
0.4
SW
6.8
5.5
2.5
0.6
7.6
0.05
6.8
7.4
1
0.1
0.4
0.6
1
7.8
NE
0.4
19.6 19.8 20 20.2 20.4
Longitude ( o E)
6
4
2
Figure 4.1: Cross-sections through the EGB from NE to SW of potential temperature (upper left),
salinity (upper right), density (lower left) and oxygen (lower right panel) on 26 September 2006. The
position of the cross-section is marked in Fig. 1.1.
(September to November), Fig. 4.3 B. The oxygen in the area below the halocline exhibits a
similar variability as the temperature, although there is no clear distinction between individual
proles. Highest oxygen concentrations in were measured in May 2006 in mid layers with
concentrations of up to 2 ml/l. Apart from the maximum oxygen concentration in May,
concentrations were rather variable. In the deepest layers of the EGB (150 − 240 m) oxygen
concentrations seemed fairly uniform only in September and November they were marginally
higher, but concentrations can still be considered as anoxic (Fig. 4.3 F). The only exemption
was the 13 November when an increase in oxygen to 0.12 ml/l was measured. At the same
time as the rise in oxygen, highest salinities were measured in the bottom layer (Fig. 4.3 D).
From these ndings it can be concluded that the inow started in September 2006 and was
46