891260.fig.004a
(a)
891260.fig.004b
(b)
891260.fig.004c
(c)
891260.fig.004d
(d)
Figure 4: SH Spring (OND) IOD positive-IOD negative cyclone track frequency composite for (a) NCEP1_5801, (b) like “a” but for ERA40_5801. Units: number of cyclones. Hatched areas are significant at 90% for 2-tailed -test. (c) SH Spring (OND) IOD positive-IOD negative cyclone track intensity composite for NCEP1_5801 (d) like “c” but for ERA40_5801. Units: hPa. Hatched areas are significant at 90% for 2-tailed -test.