HR: 09:30h
AN: H31J-07    [Abstracts]
TI: Air Pressure, Temperature and Rainfall: Insights From a Joint Multifractal Analysis
AU: * lashermes, b
EM: bruno.lashermes@ens-lyon.fr
AF: St. Anthony Falls Lab, University of Minnesota, 2 3rd Avenue SE, Minneapolis, MN 55414 United States
AU: Roux, S G
EM: stephane.roux@ens-lyon.fr
AF: Laboratoire de Physique, Ecole Normale Supérieure de Lyon, 46, allée d'Italie, Lyon, 69007 France
AU: Foufoula-Georgiou, E
EM: efi@umn.edu
AF: St. Anthony Falls Lab, University of Minnesota, 2 3rd Avenue SE, Minneapolis, MN 55414 United States
AB: Understanding the physical origin of multifractality in space-time rainfall remains a problem of continuous interest and prompts the simultaneous investigation of the multiscale structure of rainfall and other relevant meteorological variables of the storm environment. Recent wavelet-based multifractal analysis of high resolution temporal rainfall has revealed a singularity spectrum much wider than that of turbulent fluctuations and consistency with the hypothesis if a local multiplicative cascade, i.e., cascade that spans scales of 5 minutes up to the storm-burst duration.
In this work, we perform a wavelet-based (using both WTMM and newly introduced Wavelet Leaders) multifractal analysis of simultaneous high resolution (2 seconds sampling) measurements of rainfall intensity, air pressure and temperature. We explore similarities and differences in the intermittency structure of these fields and we document that the singularity spectrum of the pressure and temperature fluctuations is narrower than that of rainfall. Moreover, the temperature is shown to exhibit smoother pointwise regularity properties compared to the two other meteorological fields, that both embody stronger singularities. Physical interpretations of these findings will be discussed.
DE: 1854 Precipitation (3354)
DE: 3280 Wavelet transform (3255, 4455)
DE: 4440 Fractals and multifractals
DE: 4475 Scaling: spatial and temporal (1872, 3270, 4277)
SC: Hydrology [H]
MN: Fall Meeting 2005