Daniel Reinert's research while affiliated with Deutscher Wetterdienst and other places

Publications (34)

Article
Full-text available
Classical numerical models for the global atmosphere, as used for numerical weather forecasting or climate research, have been developed for conventional central processing unit (CPU) architectures. This hinders the employment of such models on current top-performing supercomputers, which achieve their computing power with hybrid architectures, mos...
Preprint
This article describes the implementation of grid refinement in the ICOsahedral Nonhydrostatic (ICON) modeling system. It basically follows the classical two-way-nesting approach known from widely used mesoscale models like MM5 or WRF, but differs in the way how feedback from fine grids to coarser grids is applied. Moreover, the ICON implementation...
Preprint
Classical numerical models for the global atmosphere, as used for numerical weather forecasting or climate research, have been developed for conventional central processing unit (CPU) architectures. This now hinders the employment of such models on current top performing supercomputers, which achieve their computing power with hybrid architectures,...
Article
Full-text available
The Arctic is warming faster than the global average and any other region of a similar size. One important factor in this is the poleward atmospheric transport of heat and moisture, which contributes directly to the surface and air warming. In this case study, the atmospheric circulation and spatio-temporal structure of a moisture intrusion event i...
Preprint
Full-text available
The Arctic is warming faster than the global average and any other region. One important factor for this is the poleward atmospheric transport of heat and moisture, which contributes directly to the surface and air warming. In this case study, the atmospheric circulation and spatio-temporal structure of a moisture intrusion event is assessed, which...
Article
Full-text available
How the upper-atmosphere branch of the circulation contributes to and interacts with the circulation of the middle and lower atmosphere is a research area with many open questions. Inertia–gravity waves, for instance, have moved in the focus of research as they are suspected to be key features in driving and shaping the circulation. Numerical atmos...
Article
Full-text available
This paper describes the splitting supercell idealized test case used in the 2016 Dynamical Core Model Intercomparison Project (DCMIP2016). These storms are useful test beds for global atmospheric models because the horizontal scale of convective plumes is O(1 km), emphasizing non-hydrostatic dynamics. The test case simulates a supercell on a reduc...
Article
Full-text available
How the upper-atmosphere branch of the circulation contributes to and interacts with the circulation of the middle and lower atmosphere is a research area with many open questions. Inertia-gravity waves, for instance, have moved in the focus of research as they are suspected to be key features in driving and shaping the circulation. Numerical atmos...
Article
Full-text available
We present the new isotope-enabled model ICON-ART-Iso. The physics package of the global ICOsahedral Nonhydrostatic (ICON) modeling framework has been extended to simulate passive moisture tracers and the stable isotopologues HDO and H218O. The extension builds on the infrastructure provided by ICON-ART, which allows for high flexibility with respe...
Article
Full-text available
Atmospheric composition studies on weather and climate timescales require flexible, scalable models. The ICOsahedral Nonhydrostatic model with Aerosols and Reactive Trace gases (ICON-ART) provides such an environment. Here, we introduce the most up-to-date version of the flexible tracer framework for ICON-ART and explain its application in one nume...
Article
Full-text available
This paper describes the splitting supercell idealized test case used in the 2016 Dynamical Core Model Intercomparison Project (DCMIP2016). These storms are useful testbeds for global atmospheric models because the horizontal scale of convective plumes is O(1km), emphasizing non-hydrostatic dynamics. The test case simulates a supercell on a reduced...
Article
Full-text available
ICON-A is the new icosahedral non-hydrostatic (ICON) atmospheric general circulation model in a configuration using the Max Planck Institute (MPI) physics package, which originates from the ECHAM6 general circulation model, and has been adapted to account for the changed dynamical core framework. The coupling scheme between dynamics and physics emp...
Article
Full-text available
Atmospheric composition studies on weather and climate time scales require flexible, scalable models. The ICOsahedral Nonhydrostatic model with Aerosols and Reactive Trace gases (ICON-ART) provides such an environment. Here, we introduce the most up-to-date version of the flexible tracer framework for ICON-ART and explain its application in one num...
Article
Full-text available
We present the new isotope enabled model ICON-ART-Iso. The physics of the global ICOsahedral Nonhydrostatic (ICON) modelling framework have been extended to simulate passive moisture tracers and the stable isotopologues HDO and H2¹⁸O. The extension builds on the infrastructure provided by ICON-ART, which allows a high flexibility with respect to th...
Article
Full-text available
Atmospheric dynamical cores are a fundamental component of global atmospheric modeling systems and are responsible for capturing the dynamical behavior of the Earth's atmosphere via numerical integration of the Navier–Stokes equations. These systems have existed in one form or another for over half of a century, with the earliest discretizations ha...
Article
Full-text available
Atmospheric dynamical cores are a fundamental component of global atmospheric modeling systems, and are responsible for capturing the dynamical behavior of the Earth's atmosphere via numerical integration of the Naviér–Stokes equations. These systems have existed in one form or another for over half of a century, with the earliest discretizations h...
Article
Full-text available
We present the first stage of a new online-coupled global to regional-scale modeling framework for the simulation of the spatiotemporal evolution of aerosols and trace gases. The underlying meteorological model is the new nonhydrostatic model system ICON (ICOsahedral Nonhydrostatic) which allows a local grid refinement with two-way interactions bet...
Article
Full-text available
We present the first stage of a new online-coupled global to regional scale modelling framework for the simulation of the spatiotemporal evolution of aerosols and trace gases. The underlying meteorological model is the new nonhydrostatic model system ICON (ICOsahedral Nonhydrostatic) which allows a local grid refinement with two-way interactions be...
Article
This paper describes the nonhydrostatic dynamical core developed for the ICON (ICOsahedral Nonhydrostatic) modelling framework. ICON is a joint project of the German Weather Service (DWD) and the Max Planck Institute for Meteorology (MPI-M), targeting a unified modelling system for global numerical weather prediction (NWP) and climate modelling. Co...
Data
Full-text available
Recently, a standard test case suite for 2-D linear transport on the sphere was proposed to assess important aspects of accuracy in geophysical fluid dynamics with a "minimal" set of idealized model configurations/runs/ diagnostics. Here we present results from 19 state-of-the-art transport scheme formulations based on finite-difference/finite-volu...
Article
An analytical solution for the expansion of gravity and sound waves for the linearised form of the fully compressible, non-hydrostatic, shallow atmosphere Euler equations on the sphere is derived. The waves are generated by a weak initial temperature and density perturbation of an isothermal atmosphere. The derived analytical solution can be used a...
Article
Full-text available
Recently, a standard test case suite for 2-D linear transport on the sphere was proposed to assess important aspects of accuracy in geophysical fluid dynamics with a "minimal" set of idealized model configurations/runs/diagnostics. Here we present results from 19 state-of-the-art transport scheme formulations based on finite-difference/finite-volum...
Article
Full-text available
As part of a broader effort to develop next-generation models for numerical weather prediction and climate applications, a hydrostatic atmospheric dynamical core is developed as an intermediate step to evaluate a finite-difference discretization of the primitive equations on spherical icosahedral grids. Based on the need for mass-conserving discret...
Article
Full-text available
A hydrostatic atmospheric dynamical core is developed for the purpose of global climate modelling. The model applies finite-difference methods to discretize the primitive equations on spherical icosahedral grids, using C-type staggering with triangles as control volumes for mass. This paper documents the numerical methods employed in the baseline v...
Article
In Part I the dry version of a new large-eddy simulation (LES) model was presented that is specifically designed to simulate air flow and clouds above highly complex terrain. Here the implemented moisture physics are described and a new method for the generation of turbulent inflow conditions for meteorological LES is proposed. As a typical area of...
Article
Full-text available
This paper presents the dry version of a new large-eddy simulation (LES) model, which is designed to simulate air flow and clouds above highly complex terrain. The model is three-dimensional and nonhydrostatic, and the governing equations are sound filtered by use of the anelastic approximation. A fractional step method is applied to solve the equa...
Article
Full-text available
Banner clouds appear on the leeward side of a mountain and resemble a banner or a flag. This article provides a comprehensive definition of "banner clouds". It is based primarily on an extensive collection of time lapse movies, but previous attempts at an explanation of this phenomenon are also taken into account. The following ingredients are cons...
Article
Banner clouds appear on the leeward side of a mountain and resemble a banner or a flag. This article provides a comprehensive definition of "banner clouds". It is based primarily on an extensive collection of time lapse movies, but previous attempts at an explanation of this phenomenon are also taken into account. The following ingredients are cons...
Article
Banner clouds appear on the leeward side of a mountain and resemble a banner or a flag. This article provides a comprehensive definition of "banner clouds". It is based primarily on an extensive collection of time lapse movies, but previous attempts at an explanation of this phenomenon are also taken into account. The following ingredients are cons...
Article
Full-text available
A new LES-model is presented, which has been developed at the Institute for Atmospheric Physics in Mainz. The model is well suited for the simulation of airflows and clouds in the vicinity of highly complex terrain. Validations have been conducted for the case of a spreading density current and an airflow around a surface mounted cube. It is shown,...

Citations

... Theis and Wong, 2017), HPC 15 systems are increasingly relying on specialized hardware architectures such as graphics processing units (GPUs) to increase throughput while maintaining a reasonable power envelope (Strohmaier et al., 2015). This has led to a number of efforts to port existing weather and climate models to run on such heterogeneous architectures, for example by adding OpenACC directives (Lapillonne et al., 2017;Clement et al., 2019;Giorgetta et al., 2022). Today, there is a handful of successful productive 2. Performance development: adapting the implementation to a set of given hardware architecture, optimization to reach useful simulation time. ...
... In the first event, the wind speed was misrepresented by all of the reanalyses and by HIRHAM5, whereas there was a decrease in these differences in the second event, and all of the reanalyses and HIRHAM5 represented the wind speed well in the third event. For all of the events, ERA5 seemed to more appropriately represent the maximum and minimum values of the IWV, IVT, and the vertical profiles of specific humidity and wind compared with the reference datasets (GNSS, HATPRO, and radiosondes), due to its high temporal and spatial resolution; however, a high-resolution climate model has shown increased accuracy in the spatial and vertical structure compared with ERA5 (Bresson et al., 2022). ...
... Borchert et al. [17] proposed an extension of ICON to the upper atmosphere (UA-ICON), in order to understand its influences on the tropospheric weather and climate. The main motivation was to increase the accuracy of simulations when the model top is positioned at a height greater than 100 km. ...
... The initial thermal perturbation will induce a convective updraft after initialization at the Equator. The storm, after about 60 min, will split into two counter-rotating cells and gradually propagate away from the Equator (Zarzycki et al. 2019). As the scaled grid spacing is close to the horizontal resolution of the convective regime, this supercell test is particularly suited for evaluating nonhydrostatic dynamics. ...
... Over the last two decades a number of nonhydrostatic atmospheric models used in weather and climate applications have been modified to integrate the deep-atmosphere equations that accommodate the generalizations mentioned above. These models include, for example, one of the earliest global nonhydrostatic models NICAM (Satoh et al. 2008), the Met Office model ENDGAME (Wood et al. 2014) and the research model MCore (Ullrich et al. 2014, and references therein), and the ICON model (Borchert et al. 2019). Although very few tests exist to validate deep-atmosphere equations solvers, all these models except NICAM (unreported) were evaluated with a baroclinic wave test case (Ullrich et al. 2014), where shallow and deep configurations are tested on spheres of both Earth radius and a reduced radius. ...
... Isotope-enabled numerical weather and climate models (e.g. Joussaume et al., 1984;Blossey et al., 2010;Werner et al., 2011;Pfahl et al., 2012;Eckstein et al., 2018) allow for detailed studies of the evolution of SWIs during transport (Dütsch et al., 2018;Dahinden et al., 2021). In addition to these complex numerical models, single-process models allow us to investigate the factors controlling specific processes and their effect on the isotopic composition of water vapour. ...
... ART (Aerosols and Reactive Trace Gases) is an online-coupled model extension for ICON that includes chemical gases and aerosols. One aim of the model is the simulation of interactions between the trace substances and the state of the atmosphere by coupling the spatiotemporal evolution of tracers with atmospheric processes (Schröter et al. 2018). The point source module in ART takes the prescribed emission fluxes as point sources of substances and adds them to new or existing chemical tracers by distributing the one-dimensional fluxes to the area of the corresponding triangular grid cell in ICON. ...
... In the present paper IFS-FVM is verified against the proven IFS-ST at ECMWF for the baroclinic instability benchmark in the hydrostatic regime, considering specific configurations and parameterizations of interest at ECMWF. IFS-FVM also participates in the wider DCMIP-2016 model intercomparison, and this includes the nonhydrostatic supercell test case (Zarzycki et al., 2018). ...
... The QUBICC experiments make use of very high resolution grids, on which dynamics and transport are explicitly solved. This means that only a small number of processes need to be parameterized in comparison to the low-resolution simulations presented by Giorgetta et al. (2018). This reduced physics package, which we call Sapphire physics, comprises parameterizations for radiation, vertical turbulent diffusion, and cloud microphysics in the atmosphere, and land surface physics, as detailed in Sect. ...
... Navier-Stokes equations on an icosahedral grid, which can be seamlessly adjusted in resolution for global and regional simulations. A detailed description of the model can be found in Zängl et al. (2015) and Giorgetta et al. (2018). With the extension 20 Aerosols and Reactive Trace gases (ICON-ART) developed at the Karlsruhe Institute of Technology (KIT), the model is able to simulate aerosols, trace gases, and related feedbacks (Rieger et al., 2015;Schröter et al., 2018). ...