Blar i Geophysical Institute på forfatter "Maronga, Bjørn"
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Can Areawide Building Retrofitting Affect the Urban Microclimate? An LES Study for Berlin, Germany
Maronga, Bjørn; Winkler, Matthias; Li, Dan (Journal article; Peer reviewed, 2022)In this work, we investigate the effect of areawide building retrofitting on summertime, street-level outdoor temperatures in an urban district in Berlin, Germany. We perform two building-resolving, weeklong large-eddy ... -
The Departure from Mixed-Layer Similarity During the Afternoon Decay of Turbulence in the Free-Convective Boundary Layer: Results from Large-Eddy Simulations
Elguernaoui, Omar; Reuder, Joachim; Li, Dan; Maronga, Bjørn; Bakhoday Paskyabi, Mostafa; Wolf, Tobias; Esau, Igor (Journal article; Peer reviewed, 2023)This study analyses the departure of the velocity-variances profiles from their quasi-steady state described by the mixed-layer similarity, using large-eddy simulations with different prescribed shapes and time scales of ... -
Development of a new urban climate model based on the model PALM – Project overview, planned work, and first achievements
Maronga, Bjørn; Gross, Günter; Raasch, Siegfried; Banzhaf, Sabine; Forkel, Renate; Heldens, Wieke; Kanani-Sühring, Farah; Matzarakis, Andreas; Mauder, Matthias; Pavlik, Dirk; Pfafferott, Jens; Schubert, Sebastian; Seckmeyer, Gunther; Sieker, Heiko; Winderlich, Kristina (Journal article; Peer reviewed, 2019)In this article we outline the model development planned within the joint project Model-based city planning and application in climate change (MOSAIK). The MOSAIK project is funded by the German Federal Ministry of Education ... -
Development of an atmospheric chemistry model coupled to the PALM model system 6.0: implementation and first applications
Khan, Basit; Banzhaf, Sabine; Chan, Edward C.; Forkel, Renate; Kanani-Sühring, Farah; Ketelsen, Klaus; Kurppa, Mona; Maronga, Bjørn; Mauder, Matthias; Raasch, Siegfried; Russo, Emmanuele; Schaap, Martijn; Sühring, Matthias (Journal article; Peer reviewed, 2021)In this article we describe the implementation of an online-coupled gas-phase chemistry model in the turbulence-resolving PALM model system 6.0 (formerly an abbreviation for Parallelized Large-eddy Simulation Model and now ... -
Evaluation of the dynamic core of the PALM model system 6.0 in a neutrally stratified urban environment: comparison between LES and wind-tunnel experiments
Gronemeier, Tobias; Surm, Kerstin; Harms, Frank; Leitl, Bernd; Maronga, Bjørn; Raasch, Siegfried (Journal article; Peer reviewed, 2021)We demonstrate the capability of the PALM model system version 6.0 to simulate neutrally stratified urban boundary layers. Our simulation uses the real-world building configuration of the HafenCity area in Hamburg, Germany. ... -
Implementation of the sectional aerosol module SALSA2.0 into the PALM model system 6.0: model development and first evaluation
Kurppa, Mona; Hellsten, Antti; Roldin, Pontus; Kokkola, Harri; Tonttila, Juha; Auvinen, Mikko; Kent, Christoph; Kumar, Prashant; Maronga, Bjørn; Järvi, Leena (Peer reviewed; Journal article, 2019-04-11)Urban pedestrian-level air quality is a result of an interplay between turbulent dispersion conditions, background concentrations, and heterogeneous local emissions of air pollutants and their transformation processes. ... -
Importance of radiative transfer processes in urban climate models: A study based on the PALM 6.0 model system
Salim, Mohamed H.; Schubert, Sebastian; Resler, Jaroslav; Krč, Pavel; Maronga, Bjørn; Kanani-Sühring, Farah; Sühring, Matthias; Schneider, Christoph (Journal article; Peer reviewed, 2022)Including radiative transfer processes within the urban canopy layer into microscale urban climate models (UCMs) is essential to obtain realistic model results. These processes include the interaction of buildings and ... -
An Improved Surface Boundary Condition for Large-Eddy Simulations Based on Monin–Obukhov Similarity Theory: Evaluation and Consequences for Grid Convergence in Neutral and Stable Conditions
Maronga, Bjørn; Knigge, Christoph; Raasch, Siegfried (Peer reviewed; Journal article, 2020)Monin–Obukhov similarity theory is used in large-eddy simulation (LES) models as a surface boundary condition to predict the surface shear stress and scalar fluxes based on the gradients between the surface and the first ... -
Innovative strategies for observations in the Arctic atmospheric boundary layer (ISOBAR)—The Hailuoto 2017 Campaign
Kral, Stephan; Reuder, Joachim; Vihma, Timo; Suomi, Irene; O’Connor, Ewan; Kouznetsov, Rostislav D.; Wrenger, Burkhard; Rautenberg, Alexander; Urbancic, Gabin; Jonassen, Marius Opsanger; Båserud, Line; Maronga, Bjørn; Mayer, Stephanie; Lorenz, Torge; Holtslag, Albert A.M.; Steeneveld, Gert-Jan; Seidl, Andrew; Müller, Martin; Lindenberg, Christian; Langohr, Carsten; Voss, Hendrik; Bange, Jens; Hundhausen, Marie; Hilsheimer, Philipp; Schygulla, Markus (Peer reviewed; Journal article, 2018-07-16)The aim of the research project “Innovative Strategies for Observations in the Arctic Atmospheric Boundary Layer (ISOBAR)” is to substantially increase the understanding of the stable atmospheric boundary layer (SBL) through ... -
The Innovative Strategies for Observations in the Arctic Atmospheric Boundary Layer Project (ISOBAR) — Unique fine-scale observations under stable and very stable conditions
Kral, Stephan; Reuder, Joachim; Vihma, Timo Pekka; Suomi, Irene; Haualand, Kristine Flacké; Urbancic, Gabin; Greene, Brian R.; Steeneveld, Gert Jan; Lorenz, Torge; Maronga, Bjørn; Jonassen, Marius Opsanger; Ajosenpää, Hada; Båserud, Line; Chilson, Phillip B.; Holtslag, Albert A. M.; Jenkins, Alastair David; Kouznetsov, Rostislav; Mayer, Stephanie; Pillar-Little, Elizabeth A.; Rautenberg, Alexander; Schwenkel, Johannes; Seidl, Andrew; Wrenger, Burkhard (Journal article; Peer reviewed, 2021)The Innovative Strategies for Observations in the Arctic Atmospheric Boundary Layer Program (ISOBAR) is a research project investigating stable atmospheric boundary layer (SBL) processes, whose representation still poses ... -
An Investigation of the Grid Sensitivity in Large-Eddy Simulations of the Stable Boundary Layer
Maronga, Bjørn; Li, Dan (Journal article; Peer reviewed, 2021)We revisit the longstanding problem of grid sensitivity, i.e., the lack of grid convergence in large-eddy simulations (LES) of the stable boundary layer. We use a comprehensive set of LES of the well-known Global Energy ... -
Large-eddy simulation of radiation fog with comprehensive two-moment bulk microphysics: Impact of different aerosol activation and condensation parameterizations
Schwenkel, Johannes; Maronga, Bjørn (Peer reviewed; Journal article, 2019-05-29)In this paper we study the influence of the cloud microphysical parameterization, namely the effect of different methods for calculating the supersaturation and aerosol activation, on the structure and life cycle of radiation ... -
Modeling of land–surface interactions in the PALM model system 6.0: land surface model description, first evaluation, and sensitivity to model parameters
Gehrke, Katrin Frieda; Sühring, Matthias; Maronga, Bjørn (Journal article; Peer reviewed, 2021)In this paper the land surface model embedded in the PALM model system is described and evaluated against in situ measurements at Cabauw, Netherlands. A total of 2 consecutive clear-sky days are simulated, and the components ... -
A nested multi-scale system implemented in the large-eddy simulation model PALM model system 6.0
Hellsten, Antti; Ketelsen, Klaus; Sühring, Matthias; Auvinen, Mikko; Maronga, Bjørn; Knigge, Christoph; Barmpas, Fotios; Tsegas, George; Moussiopoulos, Nicolas; Raasch, Siegfried (Journal article; Peer reviewed, 2021)Large-eddy simulation (LES) provides a physically sound approach to study complex turbulent processes within the atmospheric boundary layer including urban boundary layer flows. However, such flow problems often involve a ... -
On the effect of nocturnal radiation fog on the development of the daytime convective boundary layer: A large-eddy simulation study
Schwenkel, Johannes; Maronga, Bjørn (Journal article; Peer reviewed, 2022)The potential effect of failing to predict nocturnal deep radiation fog on the development of the daytime convective boundary layer (CBL) is studied using large-eddy simulations. Typical spring and autumn conditions for ... -
Overview of the PALM model system 6.0
Maronga, Bjørn; Banzhaf, Sabine; Burmeister, Cornelia; Esch, Thomas; Forkel, Renate; Fröhlich, Dominik; Fuka, Vladimir; Gehrke, Katrin Frieda; Geletič, Jan; Giersch, Sebastian; Gronemeier, Tobias; Groß, Günter; Heldens, Wieke; Hellsten, Antti; Hoffmann, Fabian; Inagaki, Atsushi; Kadasch, Eckhard; Kanani-Sühring, Farah; Ketelsen, Klaus; Ali Khan, Basit; Knigge, Christoph; Knoop, Helge; Krč, Pavel; Kurppa, Mona; Maamari, Halim; Matzarakis, Andreas; Mauder, Matthias; Pallasch, Matthias; Pavlik, Dirk; Pfafferott, Jens; Resler, Jaroslav; Rissmann, Sascha; Russo, Emmanuele; Salim, Mohamed; Schrempf, Michael; Schwenkel, Johannes; Seckmeyer, Gunther; Schubert, Sebastian; Sühring, Matthias; von Tils, Robert; Vollmer, Lukas; Ward, Simon; Witha, Björn; Wurps, Hauke; Zeidler, Julian; Raasch, Siegfried (Journal article; Peer reviewed, 2020)In this paper, we describe the PALM model system 6.0. PALM (formerly an abbreviation for Parallelized Large-eddy Simulation Model and now an independent name) is a Fortran-based code and has been applied for studying a ... -
Scaling the decay of turbulence kinetic energy in the free-convective boundary layer
El Guernaoui, Omar; Reuder, Joachim; Ezau, Igor; Wolf, Tobias; Maronga, Bjørn (Peer reviewed; Journal article, 2019)We investigate the scaling for decaying turbulence kinetic energy(TKE) in the free-convective boundary layer, from the time the surface heat flux starts decaying, until a few hours after it has vanished. We conduct a set ... -
Towards a better representation of fog microphysics in large-eddy simulations based on an embedded Lagrangian cloud model
Schwenkel, Johannes; Maronga, Bjørn (Journal article; Peer reviewed, 2020)The development of radiation fog is influenced by multiple physical processes such as radiative cooling and heating, turbulent mixing, and microphysics, which interact on different spatial and temporal scales with one ...