Baltic Sea

Volume transports (km 3 /d)
15
10
5
0
−5
−10
Modelled Volume Transports for Salinity greater 12 g/kg
Stolpe Channel at 17.5E eastw
Gdansk Basin at 55N southw
Gdansk Basin at 56N northw
−15
11/10/02 23/02/04 07/07/05 19/11/06 02/04/08 15/08/09
Date (dd/mm/yy)
Volume transports (km 3 /d)
8
6
4
2
0
−2
−4
−6
−8
Modelled Volume Transports for Salinity greater 12 g/kg
Stolpe Channel at 17.5E eastw
Gdansk Basin at 55N southw
Hoburg Channel at 56N northw
22/06 11/08 30/09 19/11 08/01 27/02
Date (dd/mm/yy)
A
Figure 4.19: Modelled volume transports through three sections in the Baltic Proper, Stolpe Channel at
17.5 ◦ E, Gdansk Basin at 55 ◦ N and Hoburg Channel at 56 ◦ N, positions are marked in Fig. 4.18. A:time
period 2002 - 2009, B: time period May 2006 - March 2007. Note, scales between plots slightly dier.
slightly shifts within each year. The corresponding power spectrum (Fig. 5.4 upper right panel
in the appendix) reveals 2 peaks, one at about 429 days and the other at about 321 days.
These two peaks were apparent in the volume transports of all three transects (Fig. 5.4 all
3 panels in the appendix). By comparing the transports through each of the three sections
it becomes obvious that volumes are smallest going through the Stolpe Channel and highest
going through the Hoburg Channel. Peaks of eastward volume transports of 5-day means
through the Stolpe Channel in Fig. 4.19 A vary between 4 − 6 km 3 /d and on two occasions
transports rose up to 7 km 3 /d in those 7 years. Southward volume transports through the
Gdansk Basin vary in peaks between 7 − 9 km 3 /d. Through the Hoburg channel the northward
transports are of around 9.5 km 3 /d, except for two occasions where transports increase up
to 12 and 15 km 3 /d both in December 2002 and 2003, respectively. Fig. 4.19 B shows no
seasonal or annual cycle, primarily because the main signals in the power spectrum are of just
under a year and somewhat more than a year and the time series was too short to resolve such
signals. What is striking is the fact that the storm event at 4 November is only represented
by transports through the Hoburg Channel, which expresses transports of over 9 km 3 /d that
day. The Stolpe Channel shows only a small peak in eastward transports of over 2 km 3 /d, but
the Gdansk Basin responded with very low southward transports. This will be investigate at
a later stage. In general high eastward and northward transports through the Stolpe Channel
and Hoburg Channel are responded by the Gdansk Basin with low transports. The Stolpe
71
B