Publication Abstracts
De Roode et al. 2016
De Roode, S.R., I. Sandu, J.J. van der Dussen, , P. Blossey, D. Jarecka, A. Lock, A.P. Siebesma, and B. Stevens, 2016: Shallow cumulus cloud control on the stratocumulus lifetime: LES results of EUCLIPSE/GASS Lagrangian stratocumulus transitions. J. Atmos. Sci., 73, no. 6, 2485-2508, doi:10.1175/JAS-D-15-0215.1.
Results of four Lagrangian stratocumulus to shallow cumulus transition cases as obtained from six different large-eddy simulation models are presented. The model output is remarkably consistent in terms of the representation of the evolution of the mean state, which is characterized by a stratocumulus cloud layer that raises with time and which warms and dries relative to the subcloud layer. Also the effect of the diurnal insolation on cloud-top entrainment and the moisture flux at the top of the subcloud layer are consistently captured by the models. For some cases the models diverge in terms of the liquid water path (LWP) during nighttime which can be explained from the difference in the sign of the buoyancy flux at cloud base. If the subcloud buoyancy fluxes are positive, turbulence sustains a vertically well mixed layer causing a cloud layer that is relatively cold and moist and consequently having a high LWP. After some simulation time all cases exhibit subcloud layer dynamics which appear to be similar to those of the dry convective boundary layer. The humidity flux from the subcloud towards the stratocumulus cloud layer, which is one the major sources of stratocumulus cloud liquid water, is larger during the night than during the day. The sensible heat flux becomes constant in time whereas the latent heat flux tends to increase during the transition. These findings are explained from a budget analysis of the subcloud layer. %CS NASD
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BibTeX Citation
@article{de04600m,
author={de Roode, S. R. and Sandu, I. and van der Dussen, J. J. and Ackerman, A. S. and Blossey, P. and Jarecka, D. and Lock, A. and Siebesma, A. P. and Stevens, B.},
title={Shallow cumulus cloud control on the stratocumulus lifetime: LES results of EUCLIPSE/GASS Lagrangian stratocumulus transitions},
year={2016},
journal={J. Atmos. Sci.},
volume={73},
number={6},
pages={2485--2508},
doi={10.1175/JAS-D-15-0215.1},
}
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RIS Citation
TY - JOUR ID - de04600m AU - de Roode, S. R. AU - Sandu, I. AU - van der Dussen, J. J. AU - Ackerman, A. S. AU - Blossey, P. AU - Jarecka, D. AU - Lock, A. AU - Siebesma, A. P. AU - Stevens, B. PY - 2016 TI - Shallow cumulus cloud control on the stratocumulus lifetime: LES results of EUCLIPSE/GASS Lagrangian stratocumulus transitions JA - J. Atmos. Sci. VL - 73 IS - 6 SP - 2485 EP - 2508 DO - 10.1175/JAS-D-15-0215.1 ER -
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