Figure 2: Hydrographic stations.

Geographical distribution of hydrographic (temperature and salinity) stations in the South China Sea: (a) the merged dataset (SCSPOD14), (b) the World Ocean Database 2009 (WOD09), (c) South China Sea Institute of Oceanology (SCSIO), and (d) Argo profiling floats. The number of profiles (N) is shown at the top of each panel.