A5033804790- Meteorological Phenomena and Simulations
- Computational Fluid Dynamics and Aerodynamics
- Hydrology and Watershed Management Studies
- Fluid Dynamics and Turbulent Flows
- Advanced Numerical Methods in Computational Mathematics
- Plant Water Relations and Carbon Dynamics
- Environmental Monitoring and Data Management
- Climate variability and models
- Atmospheric aerosols and clouds
- Atmospheric and Environmental Gas Dynamics
- Geophysics and Gravity Measurements
- Wind and Air Flow Studies
- Advanced Mathematical Modeling in Engineering
- Library Science and Information Systems
- Model Reduction and Neural Networks
- Fire effects on ecosystems
- Distributed and Parallel Computing Systems
- Gas Dynamics and Kinetic Theory
- Tropical and Extratropical Cyclones Research
- Advanced Data Storage Technologies
- Atmospheric chemistry and aerosols
- Scientific Computing and Data Management
- Numerical methods for differential equations
Forschungszentrum Jülich
2017-2019
Ernst Ruska Centre
2019
Deutscher Wetterdienst
2014-2017
University of Freiburg
2011-2013
Large‐eddy simulations (LES) with the new ICOsahedral Non‐hydrostatic atmosphere model (ICON) covering Germany are evaluated for four days in spring 2013 using observational data from various sources. Reference established Consortium Small‐scale Modelling (COSMO) numerical weather prediction and further standard LES codes performed used as a reference. This comprehensive evaluation approach covers multiple parameters scales, focusing on boundary‐layer variables, clouds precipitation. The...
Abstract ICON (ICOsahedral Nonhydrostatic) is a unified modeling system for global numerical weather prediction (NWP) and climate studies. Validation of its dynamical core against test suite forecasting has been recently published by Zängl et al. (2014). In the present work, an extension presented that enables it to perform as large eddy simulation (LES) model. The details implementation LES turbulence scheme in are explained cases performed validate two standard models. Despite limitations...
Abstract We present a novel Monte‐Carlo ice microphysics model, McSnow, to simulate the evolution of particles due deposition, aggregation, riming, and sedimentation. The model is an application extension super‐droplet method Shima et al. (2009) more complex problem rimed aggregates. For each individual super‐particle, mass, rime volume, number monomers are predicted establishing four‐dimensional particle‐size distribution. sensitivity various assumptions discussed based on box...
Operational weather and flood forecasting has been performed successfully for decades is of great socioeconomic importance. Up to now, forecast products focus on atmospheric variables, such as precipitation, air temperature and, in hydrology, river discharge. Considering the full terrestrial system from groundwater across land surface into atmosphere, a number important hydrologic variables are missing especially with regard shallow deeper subsurface (e.g., groundwater), which gaining...
We present a new scheme, the compact discontinuous Galerkin 2 (CDG2) method, for solving nonlinear convection-diffusion problems together with detailed comparison to other well-accepted DG methods. The CDG2 method is similar CDG that was recently introduced in work of Perraire and Persson elliptic problems. One main feature compactness stencil which includes only neighboring elements, even higher order approximation. Theoretical results showing coercivity stability Poisson heat equation are...
Abstract A slightly modified version of the idealized test set‐up used by Skamarock and Klemp is proposed: quasi linear two‐dimensional expansion sound gravity waves in a flat channel induced weak warm bubble. For this case an exact analytic solution linearized compressible, non‐hydrostatic Euler equations for shallow atmosphere has been derived. This can be as benchmark to assess dynamical cores which are basis many today's, probably most future, atmospheric models. Comparisons convergence...
Abstract In this study, the impact of varying soil moisture heterogeneity (spatial variance and structure) on development convective boundary layer shallow cumulus clouds was investigated. Applying generated via spatially correlated Gaussian random fields based a power law model idealized atmospheric vertical profiles as initial conditions, three sets large‐eddy simulations provide insight in influence ensuing growth clouds. A sensitivity strong, weak, unstructured is The simulation results...
A numerical discretization of the three‐dimensional (3D) diffusion equation for scalar case and vector (i.e. momentum equation) in terrain‐following coordinates on sphere is described. The uses horizontally explicit–vertically implicit (HE–VI) approach, which often applied atmospheric simulation models. Firstly, a spatially second‐order proposed, treats metric terms stable manner even very steep terrain. von Neumann stability analysis calculates maximum Courant number different implicitness...
We present and discuss discontinuous Galerkin (DG) schemes for dry moist atmospheric flows in the mesoscale.We derive terrain-following coordinates on sphere strong-conservation form, which makes it possible to perform computation a Cartesian grid yet conserves momentum density an f -plane.A new DG model, i.e.DG-COSMO, is compared operational model COSMO of Deutscher Wetterdienst (DWD).A simplified version suggested implemented DG-COSMO against dynamical core within DUNE framework, uses...
Abstract. Geoscientific modeling is constantly evolving, with next-generation geoscientific models and applications placing large demands on high-performance computing (HPC) resources. These are being met by new developments in HPC architectures, software libraries, infrastructures. In addition to the challenge of massively parallel systems, reproducibility simulation analysis results great concern. This due fact that based complex model implementations profiling, modeling, data processing...
The impact of soil moisture heterogeneity on the convective boundary layer (CBL) development was studied. Based results from large‐eddy simulation (LES) applying patterns along a river corridor and idealized atmospheric vertical profiles as initial conditions, this study provides insight in influence spatial scale catchment‐scale circulations (CCs) ensuing growth CBL. show that intensity organized resulting is nonlinearly dependent upon λ (SMHS) horizontal gradient. Because large SMHS strong...
Operational weather and also flood forecasting has been performed successfully for decades is of great socioeconomic importance. Up to now, forecast products focus on atmospheric variables, such as precipitation, air temperature and, in hydrology, river discharge. Considering the full terrestrial system from groundwater across land surface into atmosphere, a number important hydrologic variables are missing especially with regard shallow deeper subsurface (e.g. groundwater), which gaining...
Operational weather and also flood forecasting has been performed successfully for decades is of great socioeconomic importance. Up to now, forecast products focus on atmospheric variables, such as precipitation, air temperature and, in hydrology, river discharge. Considering the full terrestrial system from groundwater across land surface into atmosphere, a number important hydrologic variables are missing especially with regard shallow deeper subsurface (e.g. groundwater), which gaining...