Research Article

Analysis of Vertical Distribution of Ozone in Winter and Its Transport from Stratosphere to Troposphere in the Pearl River Delta Region of China

Figure 7

Vertical profile of potential vorticity during the sounding test (-axis unit hPa and -axis unit PVU).
(a) 20211201
(b) 20211208
(c) 20211222
(d) 20211229
(e) 20220105
(f) 20220112
(g) 20220126
(h) 20220209
(i) 20220216