Fig. 1 Longitude–depth sections along the equator (averaged 1.5 ◦S to 1.5 ◦N) of time-mean Argo (a) potential temperature (◦ C),
(b) salinity. See legends for shading. The thick line in (a) denotes the 20 ◦C isotherm. Black shading denotes regions of land or missing
data.