A Persistent Fog Event Involving Heavy Pollutants in Yancheng Area of Jiangsu Province

Figure 5

Spatial patterns of anomalous fields at 925 hPa from 1 to 9 December 2013. (a) Geopotential height and temperature. The blue contours are geopotential height (gpm), and the black contours are temperature (°C). (b) Wind speed and wind direction. The red arrows represent the wind direction (°), and the shading represents the wind speed (m·s⁻¹). Subplots (c) and (d) are the same as subplots (a) and (b), respectively, but for anomalous fields at 500 hPa.

(a)

(b)

(c)

(d)