Fig. 1. Total precipitable water vapour (a), 1000-850 hPa (b), 850-500 hPa (c) and 500-100 hPa (d) layer integrated water vapour

Fig. 2. Monthly average of total precipitable water vapour and its variance from 2006 to 2015

Fig. 3. The standard deviation distribution and monthly average of total precipitable water vapour from 2006 to 2015

Fig. 4. Seasonal averages of total precipitable water vapour vary with year from 2006 to 2015

Fig. 5. The standard deviation distribution and monthly average of different layer integrated water vapour from 2006 to 2015

Fig. 6. Seasonal averages of different layer integrated water vapour vary with year from 2006 to 2015. (a) 1000-850 hPa;(b) 850-500 hPa; (c) 500-100 hPa

Fig. 7. Relationship between column temperature and water vapour from 2006 to 2015 (a) and seasonal variation (b)