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 7

The distributions of the average surface RH (shaded) and wind field (black arrows) from NCEP/NCAR FNL reanalysis data for different periods in January 2013: (a) 1–31, (b) 10–14, and (c) 26–30. Red lines represent the orographic convergence line.

(a)

(b)

(c)