980816.fig.002a
(a)
980816.fig.002b
(b)
980816.fig.002c
(c)
980816.fig.002d
(d)
Figure 2: Climatological average (1979–2010) at 200 hPa in JJA for: (a) divergence (×10−6 s−1), (b) Rossby wave source (×10−11 s−2), (c) vortex stretching term (×10−11 s−2), (d) advection of absolute vorticity by divergent flow term (×10−11 s−2). The shaded areas represent positive values. The divergence contour plot has a contour interval of  s−1. Rossby wave source and its terms contour plots have contour interval of  s−2.