Preprints
https://doi.org/10.5194/egusphere-2024-1209
https://doi.org/10.5194/egusphere-2024-1209
29 Apr 2024
 | 29 Apr 2024

Investigation of non-equilibrium turbulence decay in the atmospheric boundary layer using Doppler lidar measurements

Maciej Karasewicz, Marta Wacławczyk, Pablo Ortiz-Amezcua, Łucja Janicka, Patryk Poczta, and Iwona Sylwia Stachlewska

Abstract. This work concerns analysis of turbulence in the Atmospheric Boundary Layer (ABL) short before and after the sunset. Based on a large set of the Doppler lidar measurements at rural and urban sites we analyze frequency spectra of vertical wind at different heights and show that they increasingly deviate from the −5/3 Kolmogorov’s prediction in the measured low-wavenumber part of the inertial range. We find that before the sunset the integral length scales tend to decrease with time. These findings contrast with a classical model of equilibrium decay of isotropic turbulence, which predicts that the scaling exponent should remain constant and equal to −5/3 and the integral length scale should increase in time. We explain the observations using recent theories of non-equilibrium turbulence. The presence of non-equilibrium suggests that classical parametrization schemes fail to predict turbulence statistics short before the sunset. By comparing the classical and the non-equilibrium models we conclude that the former may underestimate the dissipation rate of turbulence kinetic energy in the initial stages of decay.

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Journal article(s) based on this preprint

29 Nov 2024
Investigation of non-equilibrium turbulence decay in the atmospheric boundary layer using Doppler lidar measurements
Maciej Karasewicz, Marta Wacławczyk, Pablo Ortiz-Amezcua, Łucja Janicka, Patryk Poczta, Camilla Kassar Borges, and Iwona S. Stachlewska
Atmos. Chem. Phys., 24, 13231–13251, https://doi.org/10.5194/acp-24-13231-2024,https://doi.org/10.5194/acp-24-13231-2024, 2024
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Short summary
This work concerns analysis of turbulence in the Atmospheric Boundary Layer short before the...
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