The elliptical dimension of space-time atmospheric stratification of passive admixtures using lidar data
نویسنده
چکیده
State-of-the-art airborne lidar data of passive scalars have shown that the spatial stratification of the atmosphere is scaling: the vertical extent (Δz) of structures is typically ≈ z H x ! where Δx is the horizontal extent and Hz is a stratification exponent. Assuming horizontal isotropy, the volumes of the structures therefore vary as !x!x!x H z = !x D s where the “elliptical dimension” Ds characterizes the rate at which the volumes of typical nonintermittent structures vary with scale. Work on vertical crosssections has shown that 2+Hz=2.55±0.02 (close to the theoretical prediction 23/9). In the absence of overall advection, we expect the lifetime Δt of a structure of size Δx to vary as Δx Ht with Ht=2/3 so that the overall space-time dimension would be st D =29/9=3.22.... However, horizontal and vertical advection lead to new exponents: we argue that the temporal stratification exponent Ht≈ 1 or ≈ 0.7 depending on the relative importance of horizontal versus vertical advection velocities. We empirically test these space-time prediction using vertical time (z,t) cross-sections using passive scalar surrogates (aerosol backscatter ratio from lidar) at ~3 m resolution in the vertical, 0.5 s to 30 s in time and spanning 3-4 orders of magnitude in scale as well as new analyses of vertical (x,z) cross-sections spanning over 3 orders of magnitude in both x, z directions. In order to test the theory for density fluctuations at arbitrary displacements in (Δz, Δt) and (Δx, Δz) spaces, we developed and applied a new Anisotropic Scaling Analysis Technique (ASAT) based on nonlinear coordinate transformations. Applying this and other analyses to data spanning more than 3 orders of magnitude of
منابع مشابه
Title: Improving prediction of climate radiative forcing of atmospheric mineral dust using the CALIPSO space lidar data in conjunction with passive remote sensing and modeling
متن کامل
Mitigation of Tropospheric Delay on InSAR Interseismic Displacements
One of the major challenges of Interferometric Synthetic Aperture Radar (InSAR) technique is the existence of tropospheric effect on the results. The tropospheric effect is due to the changes of atmospheric parameters including temperature, pressure, and humidity between the master and slave images. In this research, two different methods based on spatial-temporal filters and calculation of pha...
متن کامل0.355-micrometer direct detection wind lidar under testing during a field campaign in consideration of ESA's ADM-Aeolus mission
The atmospheric wind field information is a key issue to numerical weather prediction (NWP) and climate studies. The Atmospheric Dynamic Mission-Aeolus is currently developed by the European Space Agency (ESA) to launch a wind sensing Doppler lidar in mid-2015. The high spectral resolution lidar concept is using backscattered laser signals from molecules and particles to provide accurate horizo...
متن کاملConditional Random Fields for Airborne Lidar Point Cloud Classification in Urban Area
Over the past decades, urban growth has been known as a worldwide phenomenon that includes widening process and expanding pattern. While the cities are changing rapidly, their quantitative analysis as well as decision making in urban planning can benefit from two-dimensional (2D) and three-dimensional (3D) digital models. The recent developments in imaging and non-imaging sensor technologies, s...
متن کاملReconstruction of Data Gaps in Total-Ozone Records with a New Wavelet Technique
This study introduces a new technique to fill and reconstruct daily observational of Total Ozone records containing void data for some days based on the wavelet theory as a linear time-frequency transformation, which has been considered in various fields of science, especially in the earth and space physics and observational data processing related to the Earth and space sciences. The initial c...
متن کامل