259529.fig.005a
(a)
259529.fig.005b
(b)
259529.fig.005c
(c)
259529.fig.005d
(d)
Figure 5: The same as Figure 4 but for (a) root mean square (RMS) of the 2–8 day bandpass filtered OLR, (b) frequency of the OLR values lower than 200 Wm−2, (c) covariance of the filtered OLR with horizontal vorticity advection at 600 mb, and (d) RMS of the filtered horizontal vorticity advection at 600 mb. Dashed lines are linear trends of the designated value. The Sahel rainband is indicated by solid blue lines.