FIG. 5. (a) Time series of summer WYMI (solid line) and the following winter EN3.4 index (bars) and the 21-yr running correlation between them (bottom). Dashed lines indicate the statistical significance at p , 0.1 level. The correlation for the full period of analysis is indicated at the top-left corner and it is significant at p , 0.1. (b),(c) Regressed coefficients of geopotential height at 850 hPa (gpm, contours), vertically integrated moisture flux from surface to 300 hPa (kg m21 s21, arrows), and total water transport (shading, kg m21 s21) on the WYMI for the periods 1951–79 and 1980–2008, respectively. The regressed fields correspond to a standardized WYMI of 21.
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