Baltic Sea

Depth (m)
40
45
50
55
60
4
3
2
1
0
1
38
SFN/SFS(6671)
65
70
75
R(U38/uSFN)
R(U38/uSFS)
R(SLPVP_SA/uSFN)
R(SLPVP_SA/uSFS)
0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25
Correlation Coefficient (R)
A
2
3
4
30/09 10/10 20/10 30/10 09/11 19/11 29/11 09/12 19/12
Date in 2006 (dd/mm)
Figure 4.30: A: Correlation coecients of 38 with u SFN (blue)/ u SFS (green) and
SL ∆(Ventspils-Sassnitz) with u SFN (cyan)/ u SFS (black) in 1 m steps between 43-71 m.
B: Standardised time series of 38 (grey) and depth averaged mean current of SFN and SFS (66-71
m, black).
B
deduce a dependency between the sea level dierence and the deep currents in the Stolpe
Channel? Looking at the ADCPs individually on both sides of the channel, their correlations
with 38 as well as SL ∆(VP-SA) reveals an interesting picture. Here, in (Fig. 4.30 A)
the correlation coecients of 38 with u SFN and with u SFS between 43 - 71 m show
how the correlation between the currents and the regional wind changed with every depth
layer. The correlation was repeated for SL ∆(VP-SA) with u SFN and u SFS to illustrate the
changing connection between the currents and the sea level with depth. All correlations were
calculated in 1 m steps. It becomes apparent that the regional wind had a greater inuence on
SFN's east velocity component than the sea level down to a depth of 64 m, with the negative
correlation being highest between 43 - 50 m. The inuence of the sea level increased from 64
m and gained priority down to 70 m. Comparatively, at SFS the inuences of the regional wind
and the sea level between 43 and 58 m were rather small; neither had a signicant dominant
eect on the currents. Although, the correlation of both the wind and the sea level with the
u-component of SFS increased continuously with depth, apart from a sharp jump at 59 m.
This jump coincides with the sharp salinity/ density gradient in Fig. 4.8. From 62 m down
to 70 m the inuence of the sea level increased slightly in contrast to the regional wind. It
can be concluded the inuence of the wind in the upper layer is predominant at the northern
side of the channel, whereas on the southern side the Ekman transport induced by the Coriolis
91