Fig. 4: Surface mixed layer depth and mixed layer heat budget terms during the build-up phases (1–3) of the MHW from June 1st to June 17th in CPL.

a SML depth on June 1st, d SML depth on June 17th b cumulative SST trend (1–17 June) from entrainment at the bottom of the surface mixed layer, c from shortwave radiative flux, e from longwave radiative flux, f from latent heat flux. Note sensible heat flux not shown as tendencies are negligible compared to the other terms.