A5069756939- Meteorological Phenomena and Simulations
- Atmospheric aerosols and clouds
- Atmospheric chemistry and aerosols
- Climate variability and models
- Wind and Air Flow Studies
- Atmospheric and Environmental Gas Dynamics
- Aeolian processes and effects
- Atmospheric Ozone and Climate
- Geophysics and Gravity Measurements
- Physics and Engineering Research Articles
- Aquatic and Environmental Studies
- Advanced Thermodynamics and Statistical Mechanics
- Fluid Dynamics and Turbulent Flows
- Computational Fluid Dynamics and Aerodynamics
- Radiative Heat Transfer Studies
- Precipitation Measurement and Analysis
- Solar and Space Plasma Dynamics
- Icing and De-icing Technologies
- Air Quality and Health Impacts
- Hydrogen embrittlement and corrosion behaviors in metals
- Tropical and Extratropical Cyclones Research
- Advanced Theoretical and Applied Studies in Material Sciences and Geometry
- Air Traffic Management and Optimization
- Inertial Sensor and Navigation
- Advanced Numerical Methods in Computational Mathematics
University of Bonn
2015-2024
University of Basel
2019
Karlsruhe Institute of Technology
2019
National Institute of Meteorology
2012
Johannes Gutenberg University Mainz
1987-2000
Universidade Federal do Rio de Janeiro
1993-1998
Sheffield City Council
1986
A new method is developed to obtain a conservative and positive definite advection scheme that produces only small numerical diffusion. Advective fluxes are computed utilizing the integrated flux form of Tremback et al. These normalized then limited by upper lower values. The resulting equation numerically solved means usual upstream procedure. proposed treatment not restricted but may also be applied other known algorithms which formulated in terms advective fluxes. Different tests...
A numerical one‐dimensional model of the marine boundary layer (MBL) is presented. It includes chemical reactions in gas phase and aerosol particles, focusing on reaction cycles halogen compounds. Results earlier box studies were confirmed. They showed acid‐catalyzed activation bromine from sea salt aerosol, role radicals destruction O 3 . distinct diurnal variation BrO mixing ratios with maxima at sunrise sunset was found which might be cause recently published “sunrise ozone destruction.”...
A new mass conservative flux method is presented for the numerical solution of stochastic collection equation. The consists a two-step procedure. In first step distribution drops with x′ that have been newly formed in collision process entirely added to grid box k mesh xk ⩽ xk+1. second certain fraction water transported + 1. This transport done by means an advection Different test runs are which proposed compared Berry–Reinhardt scheme. These tests show very good agreement between two...
A companion paper presented a numerical one‐dimensional model of the marine boundary layer (MBL) including chemical reactions in gas and aqueous phase, focusing on reaction cycles halogen compounds. In this we study interactions between sulfur chemistry. HOCl HOBr were found to be generally more important than H 2 O or 3 oxidation S(IV) sea salt aerosols cloud‐free MBL. The inclusion chemistry lead an increase DMS roughly 63%. This additional is caused by BrO. was also expanded for cloudy We...
A one-dimensional radiation fog model is presented which includes a detailed description of the interaction between atmospheric radiative transfer and microphysical structure fog. Aerosol particles activated cloud droplets are treated using two-dimensional joint size distribution whereby activation process aerosols explicitly modeled. For this purpose new positive definite semi-Lagrangian advection scheme developed that produces only small numerical diffusion numerically very efficient....
Abstract. The impact of six heterogeneous gas–aerosol uptake reactions on tropospheric ozone and nitrogen species was studied using two chemical transport models, the Meteorological Synthesizing Centre-West European Monitoring Evaluation Programme (EMEP MSC-W) Centre Hamburg general circulation model combined with versions Aerosol Model for Ozone Related Tracers (ECHAM-HAMMOZ). Species undergoing in both models include N2O5, NO3, NO2, O3, HNO3, HO2. Since take place at aerosol surface area,...
Abstract. An intercomparison between 10 single-column (SCM) and 5 large-eddy simulation (LES) models is presented for a radiation fog case study inspired by the Local Non-local Fog Experiment (LANFEX) field campaign. Seven of SCMs represent equivalents operational numerical weather prediction (NWP) models, whilst three are research-grade designed simulation, LESs to reproduce in best manner currently possible underlying physical processes governing formation. The LES model results variable...
In the present paper a new method is introduced for numerical solution of stochastic collection equation in cloud models dealing with two-dimensional microphysics. The based on assumption that probability collision two drops only depends water mass each and not aerosol nuclei. With this it possible to reduce one-dimensional approach. First, particle spectrum integrated over yielding drop grid. For intermediate distribution solved. resulting redistributed into aerosol–water Numerical...
The area-preserving flux-form advection algorithm is extended to monotonicity. For this, the nonlinear positive-definite flux limitation of original approach replaced by new monotone limiters. fluxes are derived for one-dimensional constant transport velocities. deformation occurring in divergent flow accounted adding a correction term, which has been from upstream method. final applicable arbitrary multidimensional problems. However, due use time-splitting method, it strictly only uniform...
Preface M1. Algebra of vectors M2. Vector functions M3. Differential relations M4. Coordinate transformations M5. The method covariant differentiation M6. Integral operations M7. Introduction to the concepts nonlinear dynamics 1. laws atmospheric motion 2. Scale analysis 3. material and local description flow 4. Atmospheric fields 5. Navier-Stokes stress tensor 6. Helmholtz theorem 7. Kinematics two-dimensional 8. Natural coordinates 9. Boundary surfaces boundary conditions 10. Circulation...
We present exact and approximate analytic expressions for the time-averaged electromagnetic energy within dielectric spheres on basis of rigorous Mie theory. Such information is importance study photochemical reactions atmospheric water spheres. Numerical results show that average inside a cloud droplet enlarged by factor exceeding 2 compared with sphere same radius surrounding medium. In regions resonance peaks may be increased more than orders magnitude.
Abstract Fog in complex terrain shows large temporal and spatial variations that can only be simulated with a three‐dimensional model, but more modifications than simply increasing the resolution are needed. For better representation of fog, we present second‐moment cloud water scheme parametrization Köhler theory which is combined mixed‐phase Ferrier microphysics scheme. The detailed PAFOG produce many differences to first‐moment responsible for typically low liquid content fog. inclusion...
Abstract An intensive observation period was conducted in September 2017 the central Namib, Namibia, as part of project Namib Fog Life Cycle Analysis (NaFoLiCA). The purpose field campaign to investigate spatial and temporal patterns coastal fog that occurs regularly during nighttime morning hours. is often linked advection a marine stratus intercepts with terrain up 100 km inland. Meteorological data, including cloud base height, deposition, liquid water path, vertical profiles wind...
Fog and low-level clouds, namely stratus, are of major concern mainly due to theiradverse effects on transportation. Visibility is drastically reduced under theoccurrence fog conditions, thus affecting aviation road traffic. For example,fog causes many troubles scheduled flights, like cancelations or delays, whilecreating dangerous driving having significant socioeconomic impacts.Moreover, apart from transportation, clouds also affect theradiation budget, specifically at the...