By analyzing 20 BL variables, we were able to show that clouds play a feedback role in driving entrainment processes above the boundary layer. Variables such as ML 0, which are typically included in "slab"-type BL models (Betts, 1973), showed significantly different means between the cloud categories. Figure 1. (a) Entrainment layer relative humidity (RH) and (b) surface latent heat flux (LE) measurements grouped by cloud category. Thin horizontal lines show the 10th, 25th, 50th, 75th, and 90th percentiles. The mean is indicated with a bold horizontal line.
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