Fig. 2: External forcing alone cannot explain the observed wave amplification.
From: Enhanced jet stream waviness induced by suppressed tropical Pacific convection during boreal summer
Circulation and SST trends over the past 40 years from the ensemble mean of the CESM-LE historical run: linear trends of JJA a Z200 (unit: m/decade), b non-zonal Z200 (unit: m/decade), c V200 (unit: m/s/decade), d the zonal mean component of Z200 (unit: m/decade), e SST (unit: K/decade), f non-global SST with the global mean SST removed in each grid (unit: K/decade), and g precipitation (unit: mm/day/decade) from 1979 to 2018 in the ensemble mean of CESM-LE historical simulations. The gray lines in d represent each of the 40 members and the black line is the ensemble mean with the observed one (in red) derived from Fig. 1d.
