HR: 16:20h
AN: NG54A-01    [Abstracts]
TI: Estimating Intermittency Exponent in Neutrally Stratified Atmospheric Surface Layer Flows: A Robust Framework Based on Magnitude Cumulant and Surrogate Analyses
AU: * Basu, S
EM: sukanta.basu@ttu.edu
AF: Texas Tech University, Atmospheric Science Group, Department of Geosciences, Lubbock, TX 79409, United States
AU: Foufoula-Georgiou, E
EM: efi@umn.edu
AF: University of Minnesota, St. Anthony Falls Laboratory, Minneapolis, MN , United States
AU: Lashermes, B
EM: bruno.lashermes046@orange.fr
AF: University of Minnesota, St. Anthony Falls Laboratory, Minneapolis, MN , United States
AU: Arnéodo, A
EM: alain.arneodo@ens-lyon.fr
AF: Ecole Normale Supérieure de Lyon, Laboratorie de Physique, Lyon, France
AB: This study proposes a novel framework based on magnitude cumulant and surrogate analyses to reliably detect and estimate the intermittency coefficient from turbulent time series and spatial fields. Intermittency coefficients estimated from a large number of neutrally stratified atmospheric surface layer turbulent series from various field campaigns and a dynamic large-eddy model simulated fields are shown to remarkably concur with well-known laboratory experimental results. In addition, a surrogate-based hypothesis testing framework is proposed and shown to significantly reduce the likelihood of detecting a spurious non-zero intermittency coefficient from non- intermittent series and fields. The discriminatory power of the proposed framework is promising for addressing the unresolved question of how atmospheric stability affects the intermittency properties of boundary layer turbulence.
DE: 3307 Boundary layer processes
DE: 4440 Fractals and multifractals
DE: 4490 Turbulence (3379, 4568, 7863)
SC: Nonlinear Geophysics [NG]
MN: 2007 Joint Assembly