Baltic Sea

essential for the ventilation of the deep EGB. Comparisons of the regional wind's frequency
spectrum with the frequency spectra of the ADCPs show a reection of its most prominent
peak in the spectrum of the wind (3.7 days) in the spectra of the deep along-slope components
of SFN (4.0 days), SFS (3.7 days), in the across-slope component of the three current meters
in the EGB and in the along-slope components of the mid and bottom sensor of mooring NE,
in mooring SW and in the sea level uctuations of the Landsort gauge observed by Hagen
and Feistel (2004).
5.3 Future Outlook
To catch the spatial dimensions intrusions and their eects on mixing, comprehensive microstructure
measurements in intermediate layers and bottom boundary layers would be useful.
For operational purposes a simple estimation of volume transports can be deducted from linear
regressions of the regional wind and sea level dierences in the Baltic Proper. In cases where
realistic model simulations of the deep Baltic Sea are set up to reproduce and substitute
observations, a high temporal resolution is crucial to obtain adequate results. Modelled hourly
and daily volume and salt transports through the Stolpe Channel (available from June 2006 to
June 2007) reproduce these 2 - 4 day uctuations very well. Whereas the 5-day mean volume
transport from the 7 year data set (2002 - 2009) of the Stolpe Channel, Gdansk Basin and
Hoburg Channel are not able to resolve these uctuations. Not only short term uctuations
cannot be resolved by the 5-day values, but also volume and salt transport magnitudes in
general are highly underestimated (Fig. 4.26), particularly for westward transports. It can be
concluded that a high temporal resolution is very desirable for precise model simulations for
future projects.
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