Picture from cruises/alkor89

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.

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