Alkor cruise 1990

The three days on the old FK Alkor in the Baltic Sea does not have a specific scientific background, it was mainly organised for student scholarship. Therefore historic measurement methods and equipment was used to get in touch with the classic oceanography. The data from this cruise has been used for handmade density, temperature and salinity plots and for calculation of geostrophic currents. A few years after this cruise, the FK Alkor has been replaced by the new FS Alkor.

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Cruise

Explanation

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Alkor cruise 1990
The old FK Alkor in Kiel, in front of the Institute of Oceanography Kiel immediately before the cruise started.
Alkor in Kiel
Alkor cruise 1990
FS Poseidon in Kiel, also a research vessel operated by the Institute of Oceanography, Kiel. Our cruise has just been started yet.
FS Poseidon in Kiel
Alkor cruise 1990
To get in contact with the historic oceanography, the students have to use the manual method to measure the salinity of the sea water. The measurement of the salinity of each water sample took about five minutes. Alltogether it took a lot of hours for all the samples.
Manually salinity measurement
Alkor cruise 1990
Laboratory work, in the background the historic Nansen-Schöpfer at the wall.
Laboratory work
Alkor cruise 1990
The Nansen-Schöpfer where used to get water samples from different water depth on this cruise. This was a good experience to see how historic measurements works. Therefore a chain of Nansen-Schöpfer have to be connected to the winch wire at different horizontal positions. When all Nansen-Schöpfer are in their specific depth a heavy weight connected to the wire was used to close the Nansen-Schöpfers. They turn around when they where released. During the rotation they shut the tubes and the special thermometers at the front side of the Nansen-Schöpfer "freeze" the in situ water temperature in that depth. Today the CTD (Conductivity, Temperature, Depth measurement instrument) replaced the Nansen-Schöpfer, but before the CTD has been developed this method was common.
Deployment of Nansen-Schoepfer
Alkor cruise 1990
A more detailed picture of a Nansen-Schöpfer. The yellow tube is for the water sample, the tubes in front hold normally the thermometers. On the right side is the fixing adapter for the winch wire.
Manually salinity measurement
Alkor cruise 1990
Waiting until the ship has been reached the exact position of the station for the next deployment of the Nansen-Schöpfer.
Work on bord
Alkor cruise 1990
Finally, the picture of the group of students and our two supervisors on bord.
Group

Back to the main page of my ship cruises, there is a lot of other interesting stuff to see