Print Email Facebook Twitter Influence of the subcloud layer on the development of a deep convective ensemble Title Influence of the subcloud layer on the development of a deep convective ensemble Author Böing, S.J. Jonker, H.J.J, Siebesma, A.P. Grabowski, W.W. Faculty Civil Engineering and Geosciences Department Geoscience and Remote Sensing Date 2012-09-30 Abstract The rapid transition from shallow to deep convection is investigated using large-eddy simulations. The role of cold pools, which occur due to the evaporation of rainfall, is explored using a series of experiments in which their formation is suppressed.A positive feedback occurs: the presence of cold pools promotes deeper, wider, and more buoyant clouds with higher precipitation rates, which in turn lead to stronger cold pools. To assess the influence of the subcloud layer on the development of deep convection, the coupling between the cloud layer and the subcloud layer is explored using Lagrangian particle trajectories. As shown in previous studies, particles that enter clouds have properties that deviate significantly from the mean state. However, the differences between particles that enter shallow and deep clouds are remarkably small in the subcloud layer, and become larger in the cloud layer, indicating different entrainment rates. The particles that enter the deepest clouds also correspond to the widest cloud bases, which points to the importance of convective organization within the subcloud layer. To reference this document use: http://resolver.tudelft.nl/uuid:b58e3eb7-95fa-4a64-b0d1-df1eea0a4baa DOI https://doi.org/10.1175/JAS-D-11-0317.1 Publisher American Meteorological Society Embargo date 2013-05-30 ISSN 1520-0426 Source http://journals.ametsoc.org/doi/abs/10.1175/JAS-D-11-0317.1 Source Journal of the Atmospheric Sciences, 69 (9), 2012 Part of collection Institutional Repository Document type journal article Rights (c) 2012 American Meteorological Society, AMS Files PDF jas-d-11-0317.1.pdf 3.83 MB Close viewer /islandora/object/uuid:b58e3eb7-95fa-4a64-b0d1-df1eea0a4baa/datastream/OBJ/view