The Influence of Climate Factors, Meteorological Conditions, and Boundary-Layer Structure on Severe Haze Pollution in the Beijing-Tianjin-Hebei Region during January 2013

Figure 11

Wind profile (horizontal vector wind and vertical wind speed (unit: m/s)) in Beijing ((a) and (b)) and Tianjin ((c) and (d)) from January 10 to 13. The shaded map is vertical wind speed, white represents ascending motion with speed < 0 m/s, and gray represents descending motion with speed > 0 m/s.

(a)

(b)

(c)

(d)