Fig. 3. Continuous underway HSRL measurements (~800 km).

Plots of a water depth from ETOPO1, b Chl, c SSC, d a_CDOM from HY-1C (Methods) with the ship track represented with the red lines. Discrete in situ measurements were obtained at stations S₁-S₅ (Methods). e Values along the ship track in Fig. 3a–d. Profiles of f b_bp, g K_d, h R retrieved by HSRL with 3 optical depths in red lines