Review Article
Trends and Variability in Precipitable Water Vapor throughout North China from 1979 to 2015
Figure 7
Annual spatial distributions of linear trends from radiosonde, ERA-interim, and MERRA-2 PWVs for three periods: (a–c) 1979–1999, (d–f) 1979–2007, and (g–i) 2008–2015.