Figure 6: Trends in temperature ((a) and (c) units: K decade −1 ) and zonal wind ((b) and (d) color fill; units: ms −1 decade −1 ) derived from the CCMs’ ensemble mean in DJF over the periods ((a)-(b)) 1960–2000 and ((c)-(d)) 2001–2050. The contour interval for the climatological zonal wind is 10ms −1 . Solid and dashed blue lines represent positive and negative contours of climatological zonal winds, respectively. The thick black lines represent the climatological positions of the thermal tropopause. Stippled regions show the trends significant at the 95%