Investigation of non-equilibrium turbulence decay in the atmospheric boundary layer using Doppler lidar measurements
| Autor: | M. Karasewicz, M. Wacławczyk, P. Ortiz-Amezcua, Ł. Janicka, P. Poczta, C. Kassar Borges, I. S. Stachlewska |
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| Jazyk: | angličtina |
| Rok vydání: | 2024 |
| Předmět: | |
| Zdroj: | Atmospheric Chemistry and Physics, Vol 24, Pp 13231-13251 (2024) |
| Druh dokumentu: | article |
| ISSN: | 3231-2024 1680-7316 1680-7324 |
| DOI: | 10.5194/acp-24-13231-2024 |
| Popis: | This work concerns analysis of turbulence in the atmospheric boundary layer (ABL) shortly before and after sunset. Based on a large set of 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 Kolmogorov's -5/3 prediction in the measured low-wavenumber part of the inertial range. We find that before 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 shortly before 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. |
| Databáze: | Directory of Open Access Journals |
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