Pages
- 1
- 2
- document
-
Trees, V.J.H. (author), de Roode, S.R. (author), Wiltink, Job I. (author), Meirink, Jan Fokke (author), Wang, P. (author), Stammes, Piet (author), Siebesma, A.P. (author)Clouds affected by solar eclipses could influence the reflection of sunlight back into space and might change local precipitation patterns. Satellite cloud retrievals have so far not taken into account the lunar shadow, hindering a reliable spaceborne assessment of the eclipse-induced cloud evolution. Here we use satellite cloud measurements...journal article 2024
- document
-
Janssens, M. (author), Vilà-Guerau de Arellano, Jordi (author), van Heerwaarden, Chiel C. (author), van Stratum, Bart J.H. (author), de Roode, S.R. (author), Siebesma, A.P. (author), Glassmeier, F. (author)Numerical simulations of the tropical mesoscales often exhibit a self-reinforcing feedback between cumulus convection and shallow circulations, which leads to the self-aggregation of clouds into large clusters. We investigate whether this basic feedback can be adequately captured by large-eddy simulations (LESs). To do so, we simulate the non...journal article 2023
- document
-
Janssens, M. (author), Vilà-Guerau De Arellano, Jordi (author), Van Heerwaarden, Chiel C. (author), de Roode, S.R. (author), Siebesma, A.P. (author), Glassmeier, F. (author)Condensation in cumulus clouds plays a key role in structuring the mean, nonprecipitating trade wind boundary layer. Here, we summarize how this role also explains the spontaneous growth of mesoscale [.O(10) km] fluctuations in clouds and moisture around the mean state in a minimal-physics, large-eddy simulation of the undisturbed period...journal article 2023
- document
- Janssens, Martin (author), Vilà-Guerau de Arellano, Jordi (author), van Heerwaarden, Chiel C. (author), van Stratum, Bart J.H. (author), Siebesma, A.P. (author), de Roode, S.R. (author), Glassmeier, F. (author) poster 2022
- document
-
De Rooy, Wim C. (author), Siebesma, A.P. (author), Baas, P. (author), Lenderink, Geert (author), de Roode, S.R. (author), De Vries, Hylke (author), Van Meijgaard, Erik (author), Meirink, Jan Fokke (author), Tijm, Sander (author), Van't Veen, Bram (author)The parameterised description of subgrid-scale processes in the clear and cloudy boundary layer has a strong impact on the performance skill in any numerical weather prediction (NWP) or climate model and is still a prime source of uncertainty. Yet, improvement of this parameterised description is hard because operational models are highly...journal article 2022
- document
-
de Roode, S.R. (author), Siebesma, A.P. (author), Jansson, F.R. (author), Janssens, Martin (author)A new generation of operational atmospheric models operating at horizontal resolutions in the range 200 m ∼ 2 km is becoming increasingly popular for operational use in numerical weather prediction and climate applications. Such grid spacings are becoming sufficiently fine to resolve a fraction of the turbulent transports. Here we analyze Large...journal article 2022
- document
-
Schrijvers, P.J.C. (author), Jonker, H.J.J. (author), de Roode, S.R. (author), Kenjeres, S. (author)This study investigated the surface temperature, air temperature and mean radiant temperature inside an idealized 2D street geometry during daytime. The goal was to unravel the relative impact of radiative transfer, heat conduction and ventilation to the urban heat budget. A building-resolving simulation model has been used, which represents...journal article 2020
- document
-
Saggiorato, B. (author), Nuijens, Louise (author), Siebesma, A.P. (author), de Roode, S.R. (author), Sandu, I. (author), Papritz, L. (author)To study the influence of convective momentum transport (CMT) on wind, boundary layer and cloud evolution in a marine cold air outbreak (CAO) we use large-eddy simulations subject to different baroclinicity (wind shear) but similar surface forcing. The simulated domain is large enough, (Formula presented.) km<sup>2</sup>), to develop typical...journal article 2020
- document
-
Pedruzo-Bagazgoitia, Xabier (author), de Roode, S.R. (author), Adler, Bianca (author), Babić, Karmen (author), Dione, Cheikh (author), Kalthoff, Norbert (author), Lohou, Fabienne (author), Lothon, Marie (author), Vilà-Guerau De Arellano, Jordi (author)The misrepresentation of the diurnal cycle of boundary layer clouds by large-scale models strongly impacts the modeled regional energy balance in southern West Africa. In particular, recognizing the processes involved in the maintenance and transition of the nighttime stratocumulus to diurnal shallow cumulus over land remains a challenge....journal article 2020
- document
-
de Roode, S.R. (author), Siebesma, A.P. (author)Momentum transport by boundary layer turbulence causes a weak synoptic-scale vertical motion. The classical textbook solution for the strength of this Ekman pumping depends on the curl of the surface momentum flux. A new solution for Ekman pumping is derived in terms of the curl of the geostrophic wind and a term that depends in a nontrivial...journal article 2020
- document
-
Helfer, K.C. (author), Nuijens, Louise (author), de Roode, S.R. (author), Siebesma, A.P. (author)Motivated by an observed relationship between marine low cloud cover and surface wind speed, this study investigates how vertical wind shear affects trade-wind cumulus convection, including shallow cumulus and congestus with tops below the freezing level. We ran large-eddy simulations for an idealized case of trade-wind convection using...journal article 2020
- document
-
Dai, Y. (author), Basu, S. (author), Maronga, Björn (author), de Roode, S.R. (author)We have identified certain fundamental limitations of a mixing-length parametrization used in a popular turbulent kinetic energy-based subgrid-scale model. Replacing this parametrization with a more physically realistic one significantly improves the overall quality of the large-eddy simulation (LES) of stable boundary layers. For the range...journal article 2020
- document
-
Wing, Allison A. (author), Stauffer, Catherine L. (author), Becker, Tobias (author), Reed, Kevin A. (author), Ahn, Min Seop (author), Arnold, Nathan P. (author), Bony, Sandrine (author), de Roode, S.R. (author), Jansson, F.R. (author)The Radiative-Convective Equilibrium Model Intercomparison Project (RCEMIP) is an intercomparison of multiple types of numerical models configured in radiative-convective equilibrium (RCE). RCE is an idealization of the tropical atmosphere that has long been used to study basic questions in climate science. Here, we employ RCE to investigate the...journal article 2020
- document
-
de Roode, S.R. (author), Frederikse, T. (author), Siebesma, A.P. (author), Ackerman, Andrew S. (author), Chylik, Jan (author), Field, Paul R. (author), Fricke, Jens (author), Gryschka, Micha (author), Hill, Adrian (author)To quantify the turbulent transport at gray zone length scales between 1 and 10 km, the Lagrangian evolution of the CONSTRAIN cold air outbreak case was simulated with seven large eddy models. The case is characterized by rather large latent and sensible heat fluxes and a rapid deepening rate of the boundary layer. In some models the...journal article 2019
- document
-
Baas, P. (author), van de Wiel, B.J.H. (author), van Meijgaard, Erik (author), Vignon, Etienne (author), Genthon, Christophe (author), van der Linden, S.J.A. (author), de Roode, S.R. (author)In this work we study the dynamics of the surface-based temperature inversion over the Antarctic Plateau during the polar winter. Using 6 years of observations from the French–Italian Antarctic station Concordia at Dome C, we investigate sudden regime transitions in the strength of the near-surface temperature inversion. Here we define “near...journal article 2019
- document
-
van Hooft, J.A. (author), Popinet, Stéphane (author), van Heerwaarden, Chiel C. (author), van der Linden, S.J.A. (author), de Roode, S.R. (author), van de Wiel, B.J.H. (author)We present a proof-of-concept for the adaptive mesh refinement method applied to atmospheric boundary-layer simulations. Such a method may form an attractive alternative to static grids for studies on atmospheric flows that have a high degree of scale separation in space and/or time. Examples include the diurnal cycle and a convective...journal article 2018
- document
- Frassoni, Ariane (author), Castilho, Dayana (author), Rixen, Michel (author), Ramirez, Enver (author), De Mattos, João Gerd Z. (author), Kubota, Paulo (author), Calheiros, Alan James Peixoto (author), De Campos Velho, Haroldo Fraga (author), de Roode, S.R. (author) journal article 2018
- document
-
Neggers, R.A.J. (author), Ackerman, Andrew S. (author), Angevine, W. M. (author), Bazile, Eric (author), Beau, I. (author), Blossey, P. N. (author), Boutle, I. A. (author), de Bruijn, C. (author), cheng, A (author), van der Dussen, J.J. (author), Fletcher, J. (author), Dal Gesso, S. (author), Jam, A. (author), Kawai, H (author), Cheedela, S. K. (author), Larson, V. E. (author), Lefebvre, Marie Pierre (author), Lock, A. P. (author), Meyer, N. R. (author), de Roode, S.R. (author), de Rooy, WC (author), Sandu, I (author), Xiao, H (author), Xu, K. M. (author)Results are presented of the GASS/EUCLIPSE single-column model intercomparison study on the subtropical marine low-level cloud transition. A central goal is to establish the performance of state-of-the-art boundary-layer schemes for weather and climate models for this cloud regime, using large-eddy simulations of the same scenes as a...journal article 2017
- document
-
van de Wiel, B.J.H. (author), Vignon, Etienne (author), Baas, P. (author), van Hooijdonk, I.G.S. (author), van der Linden, S.J.A. (author), van Hooft, J.A. (author), Bosveld, Fred C. (author), de Roode, S.R. (author), Moene, Arnold F. (author), Genthon, Christophe (author)A conceptual model is used in combination with observational analysis to understand regime transitions of near-surface temperature inversions at night as well as in Arctic conditions. The model combines a surface energy budget with a bulk parameterization for turbulent heat transport. Energy fluxes or feedbacks due to soil and radiative heat...journal article 2017
- document
-
Donovan, D.P. (author), Klein Baltink, H (author), Henzing, J. S. (author), de Roode, S.R. (author), Siebesma, A.P. (author)The links between multiple-scattering induced depolarization and cloud microphysical properties (e.g. cloud particle number density, effective radius, water content) have long been recognised. Previous efforts to use depolarization information in a quantitative manner to retrieve cloud microphysical cloud properties have also been undertaken...journal article 2016
Pages
- 1
- 2