Fig. 4

Depth-time section of (a) Temperature (°C), (b) Salinity (psu), (c) Chlorophyll (mg m⁻³), (d) Dissolved Oxygen (µM) from A-Float (WMO ID 2902202; left panel), simulated outputs from ROMS model (right panel) from 29 November 2017 to 29 December 2017. Except for A-Float measurements (left panel), all the parameters in the right panels are averaged over the box 15.9°N–16.9°N and 68. 5°E–70.4°E (marked as the green box in Fig. 8b). In panel (a), a thick black dashed line represents the depth of the 23 °C isotherm (D23; m), and a thin line is the depth of the 27 °C isotherm (D27; m). In panel (b), the thick black line represents MLD (m) and the thin dashed line is ILD (m). In panel (c), a thick pink line represents euphotic depth, a thin black dashed line represents ILD (m), and a thin red line represents MLD (m). In panel (d), a thin pink (black) line: depth of 175 (210) µM dissolved oxygen (m). The brown rectangle-shaded box at the bottom of the figure indicates the TC Ockhi period (29 November to 06 December 2017; all panels). The blue inverted triangle on top of the panel (a) indicates the surface date of A-Float profiling measurements.