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Supplementary material to “Studying the Afternoon Transition of the Planetary Boundary Layer”
20 July 2010
Marie Lothon, Laboratoire d'Aérologie, Université de Toulouse, Centre National de la Recherche Scientifique, Toulouse, France
Donald H. Lenschow, National Center for Atmospheric Research, Boulder, Colorado
Citation:
Lothon, M., and D. H. Lenschow (2010), Studying the afternoon transition of the planetary boundary layer, Eos Trans. AGU, 91(29), 253–254. [Full Article (pdf)]
Fig. S1. After Cohn and Angevine (2000). (a) Backscatter measured by the NOAA/ETL High Resolution Doppler Lidar (HRDL) on 12 August 1996 during the FLATLAND/LIFT experiment (Angevine et al., 1998). Here clouds are still active in the late afternoon, with expanded bases. (b) Doppler vertical velocity measured by HRDL on the same day showing decaying but still persisting updrafts. (c) UHF wind profiler reflectivity, which reveals the difficulty of defining the boundary layer top with reflectivity during this transition. (d) Schematic of the boundary layer diurnal cycle (after Stull, 1988) that reveals, with the white line separating the convective mixed layer from the residual layer, the uncertainty of our depiction of the PBL evolution during the late afternoon transition (symbolized here by the thick dashed orange line).
References:
Angevine, W. M., A. W. Grimsdell, L. M. Hartten, and A. C. Delany (1998), The Flatland boundary layer experiments, Bull. Am. Meteorol. Soc., 79(3), 419–431.
Cohn, S. A., and W. M. Angevine (2000), Boundary layer height and entrainment zone thickness measured by lidars and wind-profiling radars, J. Appl. Meteorol., 39(8), 1233–1247.
Stull, R. B. (1988), An Introduction to Boundary Layer Meteorology, 666 pp., Kluwer Acad.