Fig. 4: A diel continuous measurement for a fixed station.

Plots of a water depth from ETOPO1, b Chl, c SSC, d a_CDOM from HY-1C (Methods) with the ship track in red lines. Profiles of e b_bp, f K_d, g R retrieved by HSRL with 3 optical depths in red lines. Discrete in situ data were collected at different time T₁-T₅ (Methods)