Baltic Sea

Time Period Stolpe Channel at 17.5 ◦ E Gdansk Basin at 55 ◦ N Hoburg Channel at 56 ◦ N
Eastward Transport Southward Transport Northward Transport
Total Volume Transport (km 3 )
2002 - 2009 3874 -6212 8578
May 2006 - March 2007 523.20 -816.56 1065
Sep - Dec 2006 102.42 -247.33 285.15
Total Salt Transport (t)
2002 - 2009 5.02 × 10 10 (50.19 Gt) -7.82 × 10 10 (-78.24 Gt) 1.07 × 10 11 (107.44 Gt)
May 2006 - March 2007 6.88 × 10 9 (6.88 Gt) -1.03 × 10 10 (-10.33 Gt) 1.33 × 10 10 (13.34 Gt)
Sep - Dec 2006 1.35 × 10 9 (1.35 Gt) -3.12 × 10 9 (-3.12 Gt) 3.58 × 10 9 (3.58 Gt)
Table 4.3: Cumulative modelled volume (km 3 ) and salt (t) through sections displayed in Fig. 4.18.
Positive transport is either eastward (Stolpe Channel) or northward (Hoburg Channel), negative transport
is southward (Gdansk Basin).
temporal resolution in model simulations is necessary to resolve discovered uctuations. Hence,
the three dierent model data sets of volume and salt transports were compared for the time
period September to December 2006: hourly/daily transports with densities ≥ 9.5 kg/m 3 ;
5-day transports with salt ≥ 12 g/kg; 5-day mean transports created from the daily values (to
allow a direct comparison). Both 5-day data sets, VoltrpSF 9.5 and VoltrpSF 12 , are of similar
values, which are compared in Fig. 4.26 and Table 4.5. All 5-day mean volume transports
are considerably smaller than hourly as well as daily transports. This has to be taken into
consideration in the evaluation of the 5-day mean volumes and salt load through the Stolpe
Channel, Gdansk Basin and Hoburg Channel presented before. To estimate how much transports
from the dierent data sets vary from one another, the 5-day means were compared for
two dierent time periods in the analysis that follows and compiled in Table 4.1: over the
87 day deployment period of the ADCPs, as well as for a period of one year (June 2006 to
June 2007). Hourly volume transports were regarded as 100% and then daily and 5-day mean
transports were compared in relation to those hourly values. Eastward/ westward daily and
5-day transport means of VoltrpSF 9.5 and VoltrpSF 12 over the 87 day period from September
to December 2006 are all very similar. Hourly and daily volume transports (VoltrpSF 9.5 ) are
both 100%. In contrast, 5-day transports of VoltrpSF 9.5 are of 99.8% and 5-day transports
of VoltrpSF 12 are 112.8% of the hourly (VoltrpSF 9.5 ) volume transports. This high value of
112.8% is due to the very small westward transports in the VoltrpSF 12 data set. 5-day means
of VoltrpSF 9.5 produce slightly higher westward transports. Signicant dierences become ob-
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