Extended Data Figure 2. Geographical distribution of available observations.
Number of mixed layer estimates in 1°x1° longitude-latitude bins: (a) from all available observation sources; (b) from ship profiles; (c) from Argo profiles; (d) from instrumented marine mammal observations. Maximum time span (in years) covered by the combined data set in 1°x 1° longitude-latitude bins in (e) summer and in (f) winter.