Characterizing the relative role of low-frequency and turbulent processes in the nocturnal boundary layer through the analysis of two-point correlations of the wind components

► Nighttime two-point correlations are analyzed as a function of time scale. ► Low-frequency processes dominate the correlations in weak wind conditions. ► Vertical correlations of the spanwise component are negative at small time scales. ► Statistical turbulence properties may be preserved when correlations are small.