Fig.1

The stable components of the mean geopotential height field and relative humidity field at 100 hPa (a) and 500 hPa (b), and relative humidity field and the flow field at 700 hPa (c) and 850 hPa (d) during the continuous haze period in Beijing-Tianjin-Hebei region of China"

Fig.2

The stable components of the mean geopotential height field and relative humidity field at 100 hPa (a) and 500 hPa (b), and relative humidity field and the flow field at 700 hPa (c) and 850 hPa (d) during less fog and haze period in Beijing-Tianjin-Hebei region of China"

Fig.3

The stable components of the mean geopotential height field and temperature field during the continuous haze period (a) and less fog and haze period (b), and the mean U, V stable components during the continuous haze period (c) and less fog and haze period (d) in Beijing-Tianjin-Hebei region of China"

Fig.4

The stable components of the 60-day average geopotential height field in the middle and lower troposphere during the continuous haze period (a) and less fog and haze period (b) in Beijing-Tianjin-Hebei region of China"

Fig.5

Time-height profile of correlation coefficients between the stable components of the geopotential height field (a), temperature field (b), wind field U component (c), V component (d) in the typical continuous haze period and the stable components during the first 60 days of the continuous haze period in Beijing-Tianjin-Hebei region of China"

Fig.6

Time-height profile of correlation coefficients between the stable components of the geopotential height field (a), temperature field (b), wind field U component (c), V component (d) in the typical less fog and haze period and the stable >components during the first 60 days of the less fog and haze period in Beijing-Tianjin-Hebei region of China"

Fig.7

The distribution of correlation coefficients between the stable components of the wind field U component at 500 hPa in the typical continuous haze period and the stable components during the first 60 days (a), 40 days (b), 20 days (c), and 10 days (d) of the continuous haze period in Beijing-Tianjin-Hebei region of China"