Preprints
https://doi.org/10.5194/egusphere-2024-1209
https://doi.org/10.5194/egusphere-2024-1209
29 Apr 2024
 | 29 Apr 2024
Status: this preprint is open for discussion and under review for Atmospheric Chemistry and Physics (ACP).

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

Status: open (until 10 Jun 2024)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
Maciej Karasewicz, Marta Wacławczyk, Pablo Ortiz-Amezcua, Łucja Janicka, Patryk Poczta, and Iwona Sylwia Stachlewska

Data sets

Turbulence properties for June-September period at rural and urban environment Maciej Karasewicz et al. https://doi.org/10.18150/LSLM10

Doppler lidar vertical wind profiles from Rzecin during POLIMOS 2018 Pablo Ortiz-Amezcua and Lucas Alados-Arboledas https://doi.org/10.5281/zenodo.8181343

Custom collection of doppler lidar data from Warsaw between 1 Jun and 30 Sep 2023. ACTRIS Cloud remote sensing data centre unit (CLU) P. Ortiz-Amezcua et al. https://doi.org/10.60656/9d58dca11d6e4122

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

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Short summary
This work concerns analysis of turbulence in the Atmospheric Boundary Layer short before the sunset. Based on a large set of measurements at rural and urban sites we analyze how turbulence properties change in time during a rapid decay of convection. 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.