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• W2000483848 endingPage "156" @default.
• W2000483848 startingPage "137" @default.
• W2000483848 abstract "Abstract This study combines the experimental measurements with large-eddy simulation (LES) data of a neutral planetary boundary layer (PBL) documented by a 60-m tower instrumented with eight sonic anemometers, and a high-resolution Doppler lidar during the 1999 Cooperative Atmospheric and Surface Exchange Study (CASES-99) experiment. The target of the paper is (i) to investigate the multiscale nature of the turbulent eddies in the surface layer (SL), (ii) to explain the existence of a −1 power law in the velocity fluctuation spectra, and (iii) to investigate the different nature of turbulence in the two sublayers within the SL, which are the eddy surface layer (ESL; lower sublayer of the SL lying between the surface and about 20-m height) and the shear surface layer (SSL; lying between the ESL top and the SL top). The sonic anemometers and Doppler lidar prove to be proper instruments for LES validation, and in particular, the Doppler lidar because of its ability to map near-surface eddies. This study shows the different nature of turbulence in the ESL and the SSL in terms of organized eddies, velocity fluctuation spectra, and second-order moment statistics. If quantitative agreement is found in the SSL between the LES and the measurements, only qualitative similarity is found in the ESL due to the subgrid-scale model, indicating that the LES captures part of the physics of the ESL. The LES helps explain the origin of the −1 power-law spectral subrange evidence in the velocity fluctuation spectra computed in the SL using the CASES-99 dataset: strong interaction between the mean flow and the fluctuating vorticities is found in the SL, and turbulent production is found to be larger than turbulent energy transfer for k1z &gt; 1 (k1 being the longitudinal wavenumber and z the height), which is the condition of the −1 power-law existence." @default.
• W2000483848 created "2016-06-24" @default.
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• W2000483848 date "2007-01-01" @default.
• W2000483848 modified "2023-10-09" @default.
• W2000483848 title "Numerical and Experimental Investigation of the Neutral Atmospheric Surface Layer" @default.
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• W2000483848 doi "https://doi.org/10.1175/jas3831.1" @default.
• W2000483848 hasPublicationYear "2007" @default.
• W2000483848 type Work @default.

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