Long description
Figure 7
A series of three line graphs to show the change in temperature, salinity and density with depth in the Atlantic ocean.
All three graphs share the same vertical axis. The scale is the same for all three graphs and there are major and minor axis ticks on the left and right aides of each graph. However, the axis is only labelled and numbered on Figure (a) on the left. Here the vertical axis is labelled 'depth/m' and goes down from 0 m to 5300 m, with minor axis ticks at intervals of 200 m, but only the major axis ticks are numbered, from 0 m to 5000 m in intervals of 1000 m.
In all three graphs the horizontal axis is labelled and marked at the top of the graph, and the major and minor axis tick marks are also shown, unlabelled, at the bottom of the graph.
Figure (a), on the left, shows the temperature data with a red line.
The horizontal axis is labelled 'temperature/°C'. It is marked from 0 °C to 30 °C in intervals of 5 °C with unlabelled minor ticks at intervals of 1 °C.
The red line starts at 29 °C at the surface and temperature decreases rapidly to approximately 4 °C at 1000 m depth. From there the temperature drops more slowly as seen by an almost linearly change with depth to 1 °C at 5100 m.
Figure (b), in the middle, shows the salinity data with a blue line.
The horizontal axis is labelled 'salinity'. It is marked from 34 to 38 in intervals of 1 with unlabelled minor ticks at intervals of 0.2. No units are indicated.
The blue line starts at 37.2 at the surface and salinity decreases rapidly to approximately 34.2 at 800 m depth. From there the salinity increases slightly to 35 at a depth of 1800 m and then decreases slowly to 34.8 at 5100 m.
Figure (c ), on the right, shows the density data with a green line.
The horizontal axis is labelled 'density/kg m−3'. The axis scale is from range 1023.2 kg m−3to 1028.8 kg m−3 with unnumbered minor tick marks at intervals 0.4 kg m−3. The major tick marks are numbered from 1024 kg m−3 to 1028 kg m−3 in intervals of 2 kg m−3.
The green line starts at 1024 kg m−3 at the surface and density increases steadily with depth to approximately 1027.2 kg m−3 at 600 m depth. From there the density increases slowly to 1028 kg m−3 at 5100 m.