Fig. 5

Graphical representation of Fourier transform and cross wavelet transform (water temperature and wind speed) for the T2, T3 and T4 time intervals. The thick contour designates the 5% significance level against red noise and the cone of influence (COI) where edge effects might distort the picture is shown as a lighter shade. Phase arrows indicate the relative phase relationship between the series (pointing right: in-phase; left: anti-phase; down: temperature leading wind speed by 90°, up: wind speed leading temperature by 90°)