Fig. 4: Composite difference maps in the large-scale environment during the mature boreal autumn. | npj Climate and Atmospheric Science

Fig. 4: Composite difference maps in the large-scale environment during the mature boreal autumn.

From: Increasing activity of tropical cyclones in East Asia during the mature boreal autumn linked to long-term climate variability

Fig. 4

The composite difference of large-scale environment between the Period 2 and Period 1 (left panel), and positive and negative PDO phase (right panel) for a, e tropical cyclone passage frequency, b, f 850 hPa pressure vertical velocity, c, g 850 hPa relative vorticity (shaded) and 850 hPa wind (vector), and d, h sea surface temperature (shaded) and 300 hPa wind (vector) In a−h, the black dots represent significant difference at p < 0.05. In b, f, the (black) blue and cyan lines represent the (climatological) location of the Western North Pacific subtropical high (= 5875 gpm) during Period 1 and Period 2, respectively. In c, g, the 850 hPa relative vorticity is multiplied with 1,000,000 for scaling. Significance is tested using student’s t-test statistic with two-tailed distribution.

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