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 A few years after this cruise, the FK Alkor has been replaced by the new FS Alkor.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 cruise 1990 FS Poseidon in Kiel, also a research vessel operated by the Institute of Oceanography, Kiel. Our cruise has just been started yet.

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.

Alkor cruise 1990 Laboratory work, in the background the historic Nansen-Schöpfer at the wall.

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.

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.

Alkor cruise 1990 Waiting until the ship has been reached the exact position of the station for the next deployment of the Nansen-Schöpfer.

Alkor cruise 1990 Finally, the picture of the group of students and our two supervisors on bord.

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

Cruise	Explanation	Thumbnail
Alkor cruise 1990	The old FK Alkor in Kiel, in front of the Institute of Oceanography Kiel immediately before the cruise started.
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.
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.
Alkor cruise 1990	Laboratory work, in the background the historic Nansen-Schöpfer at the wall.
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.
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.
Alkor cruise 1990	Waiting until the ship has been reached the exact position of the station for the next deployment of the Nansen-Schöpfer.
Alkor cruise 1990	Finally, the picture of the group of students and our two supervisors on bord.