Fig. 2
Vertical sections of November 2021 research cruise. (a) \({\text{NO}}_{3}^{-}\) concentration [µM], (b) chlorophyll-a concentration [µ gL−1], and (c) turbulent kinetic energy dissipation rate ε [W kg−1], with longitude positions on top abscissa. White/black contours represent isopycnals every 0.3 σθ [kg m−3], and magenta line represents mixed layer depth (MLD). Symbols of ∗ and + represent profile locations for SUNADAYODA and UVMP, respectively. Satellite images from GCOM-C for (d) SST [°C] on November 14th, and (e) chlorophyll-a concentration [µ gL−1] on November 17th. Blues contours in (d) represent geostrophic velocity delimiting > 0.5 ms−1, and in (e) sea surface height (SSH) from CMEMS GLORYS12V1 reanalysis on November 14th. Magenta line in (d, e) represents the observation line, and black bars 100-m average ADCP velocity vectors during the observation time. The tow-yo survey took 3 days and 3 h along the Kuroshio over roughly 150 km. The resolutions of tow-yo profiles vary from 500 m to 3 km depending on the bottom depth. Shorelines extracted from Global Self-consistent, Hierarchical, High-resolution Geography Database (GSHHG).
