Multifractal analysis of Cn2 scintillometer data collected over a large green roof

This study investigates the variability of Cn2 data across different spatial and temporal scales using data from a large aperture scintillometer (LAS) installed on a 1 ha green roof, known as the Blue Green Wave, in Ecole nationale des ponts chaussées, near Paris. Data collected at 10-minute intervals during December 2019 and January 2020 were analysed using structure function and Universal Multifractal (UM) models. The analysis revealed strong scaling behaviour from 10 minutes to 2 hours, with UM parameters estimated as C1=0.1 for the mean intermittency codimension, α=1.8 for the multifractality index and the non-conservative parameter H is approximately 0.44, which deviates from classical turbulence theories. Our results provide a deeper understanding of the variability in Cn2 and offer insights into scaling properties relevant to turbulence studies in urban green roof environments.