Formulation of the Dutch Atmospheric Large-Eddy Simulation (DALES) and overview of its applications

Heus, Thijs; Heerwaarden, Chiel C. van; Jonker, Harm J. J.; Siebesma, A. Pier; Axelsen, Simon L.; Dries, Kees van den; Geoffroy, Olivier; Moene, Arnold F.; Pino, David; Roode, Stephan R. de; Arellano, Jordi Vilà‐Guerau de

doi:10.5194/gmd-3-415-2010

Cited by 247 publications

(302 citation statements)

References 101 publications

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“…be found in Wyngaard (2010); Moeng and Sullivan (2015). The DALES 3 computer code that we used for our LESs is documented in Heus et al (2010).…”

Section: Materials and Methods: Les Of Sheared Cblsmentioning

confidence: 99%

“…Our main data set consists of 17 LES produced with the DALES-3 code (Heus et al, 2010). The design of the experimental setup is generally inspired by Fedorovich (2006a, 2007); Pino et al (2006b) and similar DNS studies (Jonker et al, 2013;Garcia and Mellado, 2014).…”

Section: Methodsmentioning

confidence: 99%

“…However the stably stratified FA is an oscillation system and a medium for the propagation of gravity waves, which might be induced by turbulent fluctuations in the adjacent BL. To prevent reflections of gravity waves at the upper lid, the upper part of the domain forms a so called 'sponge layer', which dampens horizontal and vertical velocity fluctuation (Heus et al, 2010, section 2.5). The properties of the sponge layer are set so that it dampens all motions with a frequency larger than the Brunt-Väisälä frequency N , which is the limit for internal gravity waves.…”

Section: General Aspects Of the Les Experimental Setupmentioning

confidence: 99%

“…At the surface the flow is subject to surface friction, which is determined by a MOS surface-stress model for the first model layer. The MOS model relies on a the roughness length scale z 0 , the local wind speed, and local static stability (for details of the implementation see (Heus et al, 2010)). …”

Section: General Aspects Of the Les Experimental Setupmentioning

confidence: 99%

“…Our LESs are performed in a box-shaped domain, which is discretized using a staggered Cartesian grid that is equidistant in all directions, but has different spatial resolutions horizontally and vertically (Heus et al, 2010, section 2.6, Figure 2). The domain should be large enough to allow a free development of the largest scales motion and also ensure good estimates of ensemble statistics through horizontal plane averages.…”

Section: General Aspects Of the Les Experimental Setupmentioning

confidence: 99%

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Sheared convective boundary layers: turbulence kinetic energy and entrainment dynamics

Schröter

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4. The recent discovery of epigenetic mechanisms has surprised professional biologists more than scientific amateurs.5. The potential impacts on the climate of large scale use of wind-energy gets too little attention.6. To think out of the box is also very useful to get to know the boundaries of the box.7. Various reasons that are supposed to explain the 'Brexit' can ultimately be traced back to the UK's unique geographical situation.8. One does not have to believe in 'Free Will' to have ethical values, to experience a moral impetus or to feel a desire for the Good.Propositions belonging to the thesis, entitled ´Sheared convective boundary layers: turbulence kinetic energy and entrainment dynamics'Joel Schröter

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“…be found in Wyngaard (2010); Moeng and Sullivan (2015). The DALES 3 computer code that we used for our LESs is documented in Heus et al (2010).…”

Section: Materials and Methods: Les Of Sheared Cblsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: General Aspects Of the Les Experimental Setupmentioning

confidence: 99%

Section: General Aspects Of the Les Experimental Setupmentioning

confidence: 99%

Section: General Aspects Of the Les Experimental Setupmentioning

confidence: 99%

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Sheared convective boundary layers: turbulence kinetic energy and entrainment dynamics

Schröter

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The GASS/EUCLIPSE model intercomparison of the stratocumulus transition as observed during ASTEX: LES results

Dussen

Roode

Ackerman

et al. 2013

J. Adv. Model. Earth Syst.

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Large-eddy simulations of a Lagrangian transition from a vertically well-mixed stratocumulus-topped boundary layer to a situation in which shallow cumuli penetrate an overlying layer of thin and broken stratocumulus are compared with aircraft observations collected during the Atlantic Stratocumulus Transition Experiment. Despite the complexity of the case and the long simulation period of 40 h, the six participating state-of-the-art models skillfully and consistently represent the observed gradual deepening of the boundary layer, a negative buoyancy flux at the top of the subcloud layer and the development of a double-peaked vertical velocity variance profile. The moisture flux from the subcloud to the stratocumulus cloud layer by cumulus convection exhibits a distinct diurnal cycle. During the night the moisture flux at the stratocumulus cloud base exceeds the surface evaporation flux, causing a net drying of the subcloud layer, and vice versa during daytime. The spread in the liquid water path (LWP) among the models is rather large during the first 12 h. From additional sensitivity experiments it is demonstrated that this spread is mainly attributable to differences in the parameterized precipitation rate. The LWP differences are limited through a feedback mechanism in which enhanced drizzle fluxes result in lower entrainment rates and subsequently a reduced drying at cloud top. The spread is furthermore reduced during the day as cloud layers with a greater LWP absorb more solar radiation and hence evaporate more.

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Quantifying the transport of subcloud layer reactants by shallow cumulus clouds over the Amazon

et al. 2013

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[1] We investigate the vertical transport of atmospheric chemical reactants from the subcloud layer to the cumulus cloud layer driven by shallow convection over the Amazon during the dry season. The dynamical and chemical assumptions needed for mesoscale and global chemistry transport model parametrizations are systematically analyzed using a Large Eddy Simulation model. We quantify the mass flux transport contribution to the temporal evolution of reactants. Isoprene, a key atmospheric compound over the tropical rain forest, decreases by 8.5% h -1 on average and 15% h -1 at maximum due to mass-flux-induced removal. We apply mass flux parametrizations for the transport of chemical reactants and obtain satisfactory agreement with numerically resolved transport, except for some reactants like O 3 , NO, and NO 2 . The latter is caused by the local partitioning of reactants, influenced by UV radiation extinction by clouds and small-scale variability of ambient atmospheric compounds. By considering the longer-lived NO x (NO + NO 2 ), the transport is well represented by the parametrization. Finally, by considering heterogeneous surface exchange conditions, it is demonstrated that the parametrizations are sensitive to boundary conditions due to changes in the boundary layer dynamics.

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Formulation of the Dutch Atmospheric Large-Eddy Simulation (DALES) and overview of its applications

Cited by 247 publications

References 101 publications

Sheared convective boundary layers: turbulence kinetic energy and entrainment dynamics

Sheared convective boundary layers: turbulence kinetic energy and entrainment dynamics

The GASS/EUCLIPSE model intercomparison of the stratocumulus transition as observed during ASTEX: LES results

Quantifying the transport of subcloud layer reactants by shallow cumulus clouds over the Amazon

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