Baltic Sea

Depth (m)
50
100
150
200
17 16
4.6
2.5
2.5
3.5
5.2
NW
6.2
5.8
6.2
6
5.8
6 5.8
14.5
2.5
5.8 5.6
3
SE
θ ( o C)
15
10
5
50
100
150
200
NW
7.2
6.4
7.6
9.8
12.2
11.2
12.4
11.6
12
8.8
10.6
12.5
12.2
SE
7.4
S
12
10
8
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
NW
6
5.5 5.5
8.8
9.3
7
9.6
9.7
9.8
8.1
9 9.1
SE
19.6 19.8 20 20.2 20.4
Longitude ( o E)
9
8
7
6
5
4
50
100
150
200
NW
0.6
0.6
0.8
0.05
0.6
6.4 7
7.5
7.5
6.4
7.5
6.8
5
0.6 0.6 0.4 0.6
0.6 1 1
0.05
SE
19.6 19.8 20 20.2 20.4
Longitude ( o E)
6
4
2
Figure 4.2: Cross-sections through the EGB from NW to SE of potential temperature (upper left),
salinity (upper right), density (lower left) and oxygen (lower right panel) on 27 September 2006. The
position of the cross-section is marked in Fig. 1.1.
visible in depths down to 230m in November 2006, when some of it reached the bottom of
the basin (Fig. 4.3 F).
4.2 Propagation of temperature and current signals
The CTD proles taken at BMP271 and the CTD transects across the basin produce a picture
of the hydrographic changes in the EGB over the course of the year, but the question remains
how the observed inowing water actually circulates within the basin. Some valuable information
on the advection of the temperature signal in the EGB is provided by the three deep
moorings (SE, NE and SW) deployed between May 2006 and March 2007; their positions are
47