Baltic Sea

The deep parts of the basin are expected to be much more quiet and homogeneous unless
inowing waters cause disturbances. Variances calculated for all temperatures conrm that
temperatures of mooring SE and SW's top temperature sensors showed highest variances and
bottom sensors showed lowest variances. Mooring NE's mid temperature sensor had highest
variances of all three temperature sensors, whose values are biased due to its shorter time
series.
Mooring SW exhibited the lowest hourly and daily current speeds (see Fig. 5.3 in the appendix)
of all three moorings. Current meters of all three depths recorded low hourly current speeds of
around 5 − 10 cm/s. Current directions frequently change between northeasterly and southwesterly
directions in which a general direction can not be determined. During the storm event
highest currents of about 35 cm/s were recorded by the mid and deep current meters (slightly
lower speeds in the top current meter) travelling in a northerly direction on 2 November 2006
around 0 am and alternated to a southerly direction with speeds up to 25 cm/s 20 hours later.
Two other pronounced increases in current speed could be made out, one in the middle of
December 2006 and the other at end of January 2007. The event in January although was
the stronger one of the two with speeds again of about 20 cm/s both in northeasterly and
southwesterly directions. After the storm event current speeds were in general higher than in
the rst 6 months of the recordings.
Summing up, by looking at all three depths the highest temperature range was recorded by
mooring SE, mooring NE exhibited a slightly smaller range and a strongly limited temperature
range was encountered in the SW mooring. Mooring SW showed the least temperature variability
of all three moorings. Comparing all the uppermost current meters sitting in about 50
m depth above the bottom, it's not clear whether the inow was noted rst by mooring SE
or NE, mainly because the records of NE started on 20 September due to the re-deployment
of the mooring. Looking at mid sensors at about 20 m above the bottom and lowest sensors
sitting at 5 m above the bottom the inow was rst visible in mooring SE, then in mooring
NE and last in mooring SW. The time lag between mooring SE and mooring SW amounted to
about three weeks, the lag between mooring SE and mooring NE cannot be determined due
to missing data.
The current meter records do not show any evidence of the inow, in comparison to the temperature
signals. The variability mainly corresponds to wind eects rather than to the inowing
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