Baltic Sea

the hydrographic situation was revealed, but also geostrophic velocities could be calculated.
The hydrographic situation of the Stolpe Channel in 2006 was further described by CTD data
from its central monitoring station BMP222 (Fig. 1.1).
2.2.2 Current records
Two sub-surface moorings, deployed in August 1997 along the 220 m isobath of the EGB in
the northeast (NE) and the southwest (SW), measured currents and temperature at 170 m
depth with a recording Aanderaa current meter (RCM7). The NE mooring was positioned
at 57 ◦ 23.0 ′ N, 20 ◦ 19.5 ′ E and the SW mooring at 57 ◦ 04.0 ′ N, 19 ◦ 45.0 ′ E, see Fig. 1.2. Both
moorings simultaneously recorded current velocity and direction as well as the temperature
with a sampling interval of one hour from the 30 August 1997 until 21 July 1998. On this
basis, the zonal (u) and meridional current components (v) were computed. Thereafter, daily
averages and corresponding variances were computed for both current components and the
temperature series. These time series recorded the 1997/98 warm inow, described in the case
study of chapter 3.
The two ADCP's (positions shown in Fig. 1.1) overlapping deployment time of 87 days was
primarily used for the analysis described in chapter 4. From these measurements the zonal
(u), meridional (v) and vertical (w) velocities were obtained to estimate volume transports
across the channel which were later compared with transports obtained from the MOM4 model
simulations. Furthermore temperature records provided information on possible inows.
Long-term current measurements from May 2006 until March 2007 of three subsurface moorings,
each equipped with three current meters (Aanderaa RCM7/9) monitored the deep circulation
within the EGB. The three moorings were deployed above topographic anks in about
224 m depth. Mooring SE and mooring SW were deployed on 7 May 2006 shown in Fig. 1.1.
Mooring NE could not be recovered either in May 2006 or in September 2006, thus no data
coverage for that period. A new mooring was deployed on the 27 September 2006 to record
current and temperature data until it was recovered on 30 March 2007. The along-shelf and
across-shelf components of mooring SE and SW were obtained by calculating the rotation
angle between the vertical average of 175 − 220 m for SE (14.98 ◦ ) and between 175 − 220 m
for SW with 86.7 ◦ . The current components of mooring NE were not rotated, for a rotation
angle of -0.6 ◦ can be neglected. The current meters of SE and SW measured for 326 days,
18