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Not all clear air turbulence is Kolmogorov - The fine-scale nature of atmospheric turbulence

Rodriguez Imazio, Paola and Mininni, Pablo and Godoy, Alejandro and Rivaben, Nicolas and Dörnbrack, Andreas (2023) Not all clear air turbulence is Kolmogorov - The fine-scale nature of atmospheric turbulence. Journal of Geophysical Research: Atmospheres, 128 (2), pp. 1-25. Wiley. doi: 10.1029/2022JD037491. ISSN 2169-897X.

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Official URL: https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2022JD037491


We study a strong clear air turbulence (CAT) event experienced by the German High-Altitude Long-Range research aircraft (HALO) during the Southern Hemisphere Transport, Dynamics, and Chemistry campaign. HALO encountered CAT leeward of the southern Andes Mountains, where tropospheric airflow favored vertically propagating mountain waves that were refracted southeastward into the core of tropopause jet. Turbulence is quantified using spectral quantities and structure functions computed from in situ 100 Hz flight level data. The detected CAT region exhibits strong patchiness, characterized by separated bursts in turbulent kinetic energy and energy dissipation rate. The high resolution in situ observations reveal different turbulent scaling within each patch, in both spectra and structure functions, and following Monin and Yaglom's conversion law. One patch follows power laws with exponents −1.71 ± 0.06, −1.771 ± 0.006, and −1.56 ± 0.05 for the velocity components w, v, and u, respectively, while another patch has exponents −2.17 ± 0.12, −2.50 ± 0.08, and −1.92 ± 0.09. These patches are mediated by a third patch with less clear scaling. While the patches can deviate from Kolmogorov scaling due to the anisotropy of the airflow, they still display evidence of CAT with enhanced energy dissipation rates.

Item URL in elib:https://elib.dlr.de/193574/
Document Type:Article
Title:Not all clear air turbulence is Kolmogorov - The fine-scale nature of atmospheric turbulence
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Rodriguez Imazio, PaolaConsejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, ArgentinaUNSPECIFIEDUNSPECIFIED
Mininni, PabloUniversidad de Buenos Aires, Buenos Aires, ArgentinaUNSPECIFIEDUNSPECIFIED
Godoy, AlejandroServicio Meteorológico Nacional, Buenos Aires, ArgentinaUNSPECIFIEDUNSPECIFIED
Rivaben, NicolasServicio Meteorológico Nacional, Buenos Aires, ArgentinaUNSPECIFIEDUNSPECIFIED
Date:10 January 2023
Journal or Publication Title:Journal of Geophysical Research: Atmospheres
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 1-25
Keywords:clear air turbulence (CAT), Southern Andes, mountain waves
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Air Transportation and Impact
DLR - Research area:Aeronautics
DLR - Program:L AI - Air Transportation and Impact
DLR - Research theme (Project):L - Climate, Weather and Environment
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Transport Meteorology
Deposited By: Ziegele, Brigitte
Deposited On:25 Jan 2023 11:23
Last Modified:19 Oct 2023 15:04

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