Fig. 5: Consistency of DGPI change with TC genesis and its linear decomposition.
From: Asymmetric response of the Western North Pacific tropical cyclone genesis to symmetric CO2 pathway
a, c, e Climatology of DGPI (shading) and TC genesis (# TC month−1 (5° spherical cap)−1, contour; same as Fig. 3a, c, g) in the WNP region during (a) mid-RU and (c) mid-RD, and (e) differences between the two periods. The spatial pattern correlation between DGPI and TC genesis is indicated in the upper right corner of each panel, with an asterisk denoting statistically significant value at the 95% confidence level according to the two-tailed Student’s t-test. g Linearly reconstructed DGPI change (Eq. 3; shading and contour) and contributions from (b) low-level absolute vorticity, (d) mid-level shear vorticity, (f) mid-level pressure velocity, and (h) vertical wind shear changes. Only statistically significant changes at the 95% confidence level, based on the two-tailed Student’s t-test, are illustrated. The blue box (15–27.5°N, 105–170°E) in (b) and (d–h), same to the one in Fig. 3g, denotes the region with a notable decrease in TC genesis. Dotted grid points mark statistically significant changes in TC genesis over the ocean within the boxed region. Only the TC peak season from July to September is analyzed.
