30 
No hydrographical investigations were planned 
for cruise no, 29 (1972); only a CTD was run shortly 
before each radiological station in order to be able 
to take the depth range of the highly saline water, 
originating from the Mediterranean Sea, for specifi« 
cation of the sampler depths, 
The question of the movement processes in the 
region of the Iberia Abyssal Plain was first resumed 
once again during cruise no, 33 (1974). Three moorings 
with current meters in the 100 m to 150 m depth range, 
at different levels of the highly saline water origin- 
ating from the Mediterranean Sea, and in the region 
of the deep sea (4,500 to 5,300 m) were set out in 
the dumping area for radioactive wastes (42° N to 
43° N, 14° W to 15° W) for 20, resp. 35, days. In 
addition, hydrographic casts and CTD measurements 
were taken in the whole of the region between the 
Bay of Biscay, the Azores, and the outlet of the 
Mediterranean Sea: that is, far to the South and West 
of the dumping area, in order to track the spreading 
of the Mediterranean Sea water, Fig. 81 shows a crosS- 
section (temperature and salinity) in the northerl1y 
part; this Figure was placed at our disposal by Dipl. 
0z. Gerd Wegner (DWK). Frequently, hydrographic casts 
or CTIDs were also run at the same positions at dif- 
ferent times, in order to get some idea of the temporal 
difference of the vertical temperature and salinity 
distribution. 
B 1.2 Data acquisition and processing 
Apart from the Nansen samplers, mainly plastic 
reversing water samplers from Messrs. Hydro-Bios were 
used for the hydrographic casts. The temperatures were 
determined by standard reversing thermometers, and 
were corrected with the respective calibration factors.