Figure 3
From: A peculiar lens-shaped structure observed in the South China Sea
Potential vorticity (PV; ×10−9 m−1 s−1) along transect E based on observations and CMEMS reanalysis. Top: Planetary PV (PPV). Bottom: absolute PV. PV values are color coded. Isopycnals (black contours) bound the lens-shaped structure (20.6 σ θ and 21.4 σ θ for observations as Fig. 2i; 20 σ θ and 21 σ θ for reanalysis as Fig. 4i). The in situ velocities are only available below 24.7 m, and hence the blank area is shown above ~25 m in (b). The dashed boxes (right column) represent the area where observed data were collected. The figure is generated using Matlab R2011a (www.mathworks.com/).
