Exercise 4: Water masses.

You are asked to identify the point on one of the curves in the right diagram that corresponds to the salinity minimum in the TS-diagram of the station at 30°S. This involves these steps:

1. Identify the colour of the TS-diagram for the station located at 30°S.

2. Identify the salinity curve of the same colour in the diagram on the right. This is the vertical salinity profile for the station at 30°S.

3. Look for a minimum in the vertical salinity profile at that station. A salinity minimum is a point on the curve where salinity values are lower than above and below.