Baltic Sea

θ ( o C)
7
100
8.6
6.5
8.8
Depth (m)
150
9.2
9.4
6
200
9.5
a
pot. Density contours (kg/m 3 9.55
)
19.6 19.7 19.8 19.9 20 20.1 20.2 20.3 20.4
5.5
5
θ ( o C)
7
100
9
8.6
9.2
6.5
Depth (m)
150
9.4
9.5
9.55 9.6
6
200
9.7
9.8
b
5.5
pot. Density contours (kg/m 3 )
19.6 19.7 19.8 19.9 20 20.1 20.2 20.3 20.4
Longitude ( o E)
5
Figure 3.5: Horizontal section of potential temperature vs. depth and density contours of M-7 (a) and
M-8 (b) at latitude 57.24 ◦ N. Its position is marked as a horizontal line in Fig. 1.2.
could be detected within comparable layers during pre-inow conditions, Fig. 3.5 a. Here,
estimated Tu values (∼ -45 ◦ ) point to a much weaker diusive convective mixing with a slight
tendency for the stable regime (ii).
From the methodical point of view, it must be noted that the detected horizontal extent of such
intrusive patches is almost always below the CTD grid resolution. The well known sampling
theorem postulates that the smallest resolved spatial scale is just twice of the station spacing
used. This means for the MESODYN hydrographic data sets with the station resolution of
32