Articles | Volume 15, issue 17
Atmos. Chem. Phys., 15, 10071–10086, 2015
https://doi.org/10.5194/acp-15-10071-2015

Special issue: The Boundary-Layer Late Afternoon and Sunset Turbulence (BLLAST)...

Atmos. Chem. Phys., 15, 10071–10086, 2015
https://doi.org/10.5194/acp-15-10071-2015
Research article
09 Sep 2015
Research article | 09 Sep 2015

Turbulence vertical structure of the boundary layer during the afternoon transition

C. Darbieu et al.

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Blay-Carreras, E., Pardyjak, E. R., Pino, D., Alexander, D. C., Lohou, F., and Lothon, M.: Countergradient heat flux observations during the evening transition period, Atmos. Chem. Phys., 14, 9077–9085, https://doi.org/10.5194/acp-14-9077-2014, 2014a.
Blay-Carreras, E., Pino, D., Vilà-Guerau de Arellano, J., van de Boer, A., De Coster, O., Darbieu, C., Hartogensis, O., Lohou, F., Lothon, M., and Pietersen, H.: Role of the residual layer and large-scale subsidence on the development and evolution of the convective boundary layer, Atmos. Chem. Phys., 14, 4515–4530, https://doi.org/10.5194/acp-14-4515-2014, 2014b.
Brazel, A., Fernando, H., Hunt, J., Selover, N., Hedquist, B., and Pardyjak, E.: Evening Transition Observations in Phoenix, Arizona, J. Appl. Meteorol., 44, 99–112, 2005.
Canut, G., Lothon, M., Saïd, F., and Lohou, F.: Observation of entrainment at the interface between monsoon flow and the Saharan Air Layer, Quarterly Journal of the Royal Meteorological Society, 136, 34–46, 2010.
Carvalho, J., Degrazia, G., Anfossi, D., Goulart, A., Cuchiara, G. C., and Mortarini, L.: Simulating the characteristic patterns of the dispersion during sunset PBL, Atmos. Res., 98, 274–284, https://doi.org/10.1016/j.atmosres.2010.06.009, 2010.
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Short summary
A case study of the BLLAST experiment is considered to explore the decay of turbulence that occurs in the convective boundary layer over land during the afternoon. Based on observations and on a large-eddy simulation, the analysis reveals two phases in the afternoon: a first quasi-stationary phase when the turbulent kinetic energy slowly decays without significant change in the turbulence structure and a second phase of more rapid decay with a change in spectral turbulence characteristics.
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