A5065424440- Meteorological Phenomena and Simulations
- Climate variability and models
- Tropical and Extratropical Cyclones Research
- Computational Fluid Dynamics and Aerodynamics
- Geophysics and Gravity Measurements
- Oceanographic and Atmospheric Processes
- Fluid Dynamics and Turbulent Flows
- Solar and Space Plasma Dynamics
- Geomagnetism and Paleomagnetism Studies
- Ocean Waves and Remote Sensing
- Atmospheric and Environmental Gas Dynamics
- Ionosphere and magnetosphere dynamics
- Navier-Stokes equation solutions
- Wind and Air Flow Studies
- Black Holes and Theoretical Physics
- Advanced Thermodynamics and Statistical Mechanics
- Numerical methods for differential equations
- Hydrocarbon exploration and reservoir analysis
- Reservoir Engineering and Simulation Methods
- Wind Energy Research and Development
- Advanced Numerical Methods in Computational Mathematics
- Cosmology and Gravitation Theories
- Earthquake Detection and Analysis
- Matrix Theory and Algorithms
- Advanced Numerical Analysis Techniques
Leibniz Institute of Atmospheric Physics at the Rostock University
2017-2022
University of Rostock
2012-2019
Leibniz Association
2014
Czech Academy of Sciences, Institute of Atmospheric Physics
2013
Max Planck Society
2008-2011
Max Planck Institute for Meteorology
2001-2011
University of Bonn
2004-2007
German Meteorological Service
2003
Higher-order finite-volume flux operators for transport algorithms used within Runge–Kutta time integration schemes on irregular Voronoi (hexagonal) meshes are proposed and tested. These generalizations of third- fourth-order currently in atmospheric models employing regular, orthogonal rectangular meshes. Two-dimensional least squares fit polynomials to evaluate the higher-order spatial derivatives needed cancel leading-order truncation error terms standard second-order centered...
Abstract This study describes a new global non‐hydrostatic dynamical core (ICON‐IAP: Icosahedral Nonhydrostatic model at the Institute for Atmospheric Physics) on hexagonal C‐grid which is designed to conserve mass and energy. Energy conservation achieved by discretizing antisymmetric Poisson bracket mimics correct energy conversions between different kinds of (kinetic, potential, internal). Because structure this even possible in complicated numerical environment with (i) occurrence...
Abstract Numerical weather, climate, or Earth system models involve the coupling of components. At a broad level, these components can be classified as resolved fluid dynamics, unresolved dynamical aspects (i.e., those represented by physical parameterizations such subgrid-scale mixing), and nonfluid radiation microphysical processes. Typically, each component is developed, at least initially, independently. Once development mature, are coupled to deliver model required complexity. The...
Abstract A set of compressible non‐hydrostatic equations for a turbulence‐averaged model atmosphere comprising dry air and water in three phases plus precipitating fluxes is presented, which common approximations are introduced such way that no inconsistencies occur the associated budget energy, mass Ertel's potential vorticity. These conservation properties prerequisite any climate simulation or NWP model. It shown Poisson bracket form ideal fluid part full‐physics equation can be found,...
Abstract This paper provides a comprehensive derivation of the total energy equations for atmospheric components Earth System Models (ESMs). The assumptions and approximations made in this are motivated discussed. In particular, it is emphasized that closing budget conceptually challenging hard to achieve practice without resorting ad hoc fixers. As concrete example, terms diagnosed realistic climate simulation using global atmosphere model. largest errors example spurious dynamical core...
Abstract. The Icosahedral Shallow Water Model (ICOSWM) has been a first step in the development of ICON (acronym for ICOsahedral Nonhydrostatic) models. is joint project Max Planck Institute Meteorology Hamburg (MPI-M) and Deutscher Wetterdienst (DWD) new unified general circulation models climate modeling numerical weather forecasting on global or regional domains. A short description ICOSWM given. Standard test cases are used to performance ICOSWM. National Center Atmospheric Research...
Abstract Classical mass flux parametrization schemes for cumulus convection generally transport heat and moisture only but do not include a net transport. This is well justified large grid spacings comprising the whole convective circulation in local column, such that all fluxes locally cancel out. A conceptual problem arises finer as used contemporary numerical weather prediction (NWP) models, when becomes partially resolvable . can be overcome by hybrid approach presented here. Only...
Numerical models of the atmosphere should fulfil fundamental physical laws. The second law thermodynamics is associated with positive local entropy production and dissipation available energy. In order to guarantee this positivity in numerical simulations, subgrid‐scale turbulent fluxes heat, water vapour momentum are required depend on numerically resolved gradients a unique way. task parametrization remains deliver phenomenological coefficients. Inspecting commonly used parametrizations...
Numerical formulations of turbulent heat fluxes must lead to positive energy dissipation contained in the resolved scales and internal entropy production. Current parametrization approaches deliver rates only for free convection, not forced convection. This contribution explains how are achieved by a new formulation subgrid‐scale terms case stable stratification. is importance numerical realization breakdown gravity waves. A atmosphere tends an isentropic stratification, because addition...
This article discusses the generalized Coriolis and friction terms on hexagonal C‐grid from two perspectives: (a) within linearized discretized momentum equations an equilateral grid, (b) as nonlinear a distorted mesh. The discrete are formulated using trivariate coordinate system. tendencies of different forcing for each wind component must be linearly dependent. constraint determines unique discretizations term. vorticity flux term around zonal mean current requires only four rhombus...
Abstract The primary interest of the paper is to apply a two-time-level split explicit time scheme developed by one authors Lokal-Modell (LM) German Weather Service (DWD). This model belongs operational NWP system at DWD, which makes it particularly interesting for this study. To better understand implementation in compressible nonhydrostatic type, and so LM, linear analysis presented demonstrating how equations are be up into fast- slow-mode parts. For fast-mode part, demonstrates connected...
The monitoring of conservation properties is essential for model development and the investigation hydrological cycle. This especially relevant models that do not solve equations in flux form apply a finite volume discretization. mesoscale COSMO are evaluated by using diagnostic approach. That subdomain budget energy, water mass total diagnosed control can be placed at each site domain independent grid size. Thus, this method has major advantage it applied to realistic simulations....
Abstract The Ertel’s potential vorticity (EPV) budget equation does not see the contribution of an inactive EPV flux component ∇θ × ∇B because it drops out when taking divergence. A part actual can always be interpreted as such and is thus likewise shed from equation. deviation this called active associated wind wind. horizontal comparable to ageostrophic vertical similar isentropic displacement In contrast wind, vanish at surface, blows along isentropes, which may intersect ground....
Abstract. The Icosahedral Shallow Water Model (ICOSWM) has been a first step in the development of ICON (acronym for ICOsahedral Nonhydrostatic) models. is joint project Max Planck Institute Meteorology Hamburg (MPI-M) and Deutscher Wetterdienst (DWD) new unified general circulation models climate modeling numerical weather forecasting on global or regional domains. A short description ICOSWM given. Standard test cases are used to performance ICOSWM. National Center Atmospheric Research...