A5021731172- Atmospheric aerosols and clouds
- Atmospheric chemistry and aerosols
- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Solar Radiation and Photovoltaics
- Aeolian processes and effects
- Meteorological Phenomena and Simulations
- Air Quality Monitoring and Forecasting
- Calibration and Measurement Techniques
- Precipitation Measurement and Analysis
- Remote Sensing in Agriculture
- Solar and Space Plasma Dynamics
- Air Quality and Health Impacts
- Impact of Light on Environment and Health
- Remote-Sensing Image Classification
- Climate variability and models
- Geochemistry and Geologic Mapping
- Radiative Heat Transfer Studies
- Planetary Science and Exploration
- Spacecraft Design and Technology
- Spectroscopy and Laser Applications
- Geophysics and Gravity Measurements
- Ionosphere and magnetosphere dynamics
- Advanced Aircraft Design and Technologies
- Urban Heat Island Mitigation
Ludwig-Maximilians-Universität München
2016-2025
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
2006-2025
Max Planck Institute for Meteorology
2020-2023
Czech Academy of Sciences, Institute of Atmospheric Physics
2010
Physikalisch-Meteorologisches Observatorium Davos
2009
Federal Office of Meteorology and Climatology MeteoSwiss
2009
European Severe Storms Laboratory
2006
University of Bremen
2002-2005
Abstract. libRadtran is a widely used software package for radiative transfer calculations. It allows one to compute (polarized) radiances, irradiance, and actinic fluxes in the solar thermal spectral regions. has been various applications, including remote sensing of clouds, aerosols trace gases Earth's atmosphere, climate studies, e.g., calculation forcing due different atmospheric components, UV forecasting, photolysis frequencies, other planets our system. The described Mayer Kylling...
A passive satellite radiometer operating at submillimetre wavelengths can measure cloud ice water path (IWP), particle size, and altitude. The paper first discusses the scientific background for such measurements. Formal mission requirements are derived, based on this earlier assessments. then presents a comprehensive prototype instrument concept, demonstrates that it meets requirements. is conically scanning 12-channel with channels between 183 664 GHz, proposed to fly in tandem one of...
Abstract. Although solar radiation initially is unpolarized when entering the Earth's atmosphere, it polarized by scattering processes with molecules, water droplets, ice crystals, and aerosols. Hence, measurements of polarization state can be used to improve remote sensing aerosols clouds. The analysis radiance requires an accurate radiative transfer model. To this end, a new efficient flexible three-dimensional Monte Carlo code compute radiances has been developed implemented into MYSTIC...
Abstract. Remote sensing of aerosol from space is a challenging and typically underdetermined retrieval task, requiring many assumptions to be made with respect the surface models. Therefore, quality priori information plays central role in any process (apart cloud screening procedure forward radiative transfer model, which most accurate should include treatment light polarization molecular-aerosol coupling). In this paper performance various algorithms spectral optical thickness...
Abstract. A solar eclipse is a rare but spectacular natural phenomenon and furthermore it challenge for radiative transfer modelling. Whereas simple one-dimensional model with reduced irradiance at the top of atmosphere can be used to calculate brightness during partial eclipses much more sophisticated required (i.e. diffuse radiation) total eclipse. The reason that radiation reaching detector in shadow gets there exclusively by horizontal transport photons spherical shell atmosphere, which...
Abstract. The international research project RECONCILE has addressed central questions regarding polar ozone depletion, with the objective to quantify some of most relevant yet still uncertain physical and chemical processes thereby improve prognostic modelling capabilities realistically predict response layer climate change. This overview paper outlines scope general approach RECONCILE, it provides a summary observations in 2010 2011 that have generated an many respects unprecedented...
Background People with reduced glomerular filtration rate (GFR) often have elevated cardiac troponin T (cTnT) levels. It remains unclear how cTnT levels develop over time in those chronic kidney disease (CKD). The aim of this study was to prospectively the association between and GFR older advanced‐stage CKD patients not on dialysis. Methods Results EQUAL (European Quality Study) is an observational prospective cohort stage 4 5 aged ≥65 years dialysis (incident estimated GFR, <20...
In the thermal spectral range, there are millions of individual absorption lines water vapor, CO2, and other trace gases. Radiative transfer calculations wavelength-integrated quantities, such as irradiance heating rate, computationally expensive, requiring a high resolution for accurate numerical weather prediction climate modeling. This paper introduces method that could highly reduce cost integration in spectrum by employing an optimized wavelength sampling method. Absorption optical...
This article describes one of the scattering algorithms three‐dimensional polarized radiative transfer model ARTS (Atmospheric Radiative Transfer Simulator) which has been implemented to study for example influence cirrus clouds on microwave limb sounding. The uses DOIT (Discrete Ordinate Iterative) method solve vector equation. implementation a discrete ordinate is challenging due spherical geometry atmosphere required simulation radiances. involved numerical issues, are grid optimization...
We compare a number of radiative transfer models for atmospheric sounding in the millimeter and submillimeter wavelength range, check their consistency, investigate deviations from each other. This intercomparison deals with three different aspects models: (1) inherent physics gaseous absorption lines how they are modeled, (2) calculation coefficients, (3) full geometries, i.e., up‐looking, down‐looking, limb‐looking. The correctness consistency implementations tested by comparing...
Abstract. Air mass factors (AMFs) are used in passive trace gas remote sensing for converting slant column densities (SCDs) to vertical (VCDs). AMFs traditionally computed with 1D radiative transfer models assuming horizontally homogeneous conditions. However, when observations made high spatial resolution a heterogeneous atmosphere or above surface, 3D effects may not be negligible. To study the importance of on different types sensing, we implemented 1D-layer and 3D-box into Monte carlo...
This paper introduces a three-dimensional (3-D) polarized radiative transfer model that has been developed to assess the influence of cirrus clouds on radiances measured by Earth Observing System Microwave Limb Sounder (EOS-MLS) instrument. EOS-MLS is Aura satellite, which launched in July 2004. The uses reversed Monte Carlo algorithm and incorporated Atmospheric Radiative Transfer Simulator 1.1.x software package. will be used study aspects scattering problem are not considered existing...
Airborne measurements of spectral upwelling radiances (350–2200 nm) reflected by cirrus using the Spectral Modular Radiation measurement sysTem (SMART)‐Albedometer were made over land and water surfaces. Based on these data, cloud optical thickness τ effective radius R eff observed retrieved. By different crystal shape assumptions (hexagonal plates, solid hollow columns, rough aggregates, planar spatial rosettes, ice spheres, a mixture particle habits) in retrieval, influence retrieved was...
Context. Ground-based observations of the Earthshine, i.e., light scattered by Earth to Moon, and then reflected back Earth, simulate space our planet represent a powerful benchmark for studies Earth-like planets. Earthshine spectra are strongly linearly polarized, owing scattering molecules small particles in atmosphere surface reflection, may allow us measure global atmospheric properties Earth.
Abstract. Losses of reflected Direct Normal Irradiance due to atmospheric extinction in concentrated solar tower plants can vary significantly with site and time. The losses the direct normal irradiance between heliostat field receiver a plant are mainly caused by scattering absorption aerosol water vapor concentration boundary layer. Due high particle number, radiation be larger desert environments compared standard conditions which usually considered ray-tracing or optimization tools....