A5000347460- Meteorological Phenomena and Simulations
- Climate variability and models
- Precipitation Measurement and Analysis
- Atmospheric and Environmental Gas Dynamics
- Plant Water Relations and Carbon Dynamics
- Cryospheric studies and observations
- Aeolian processes and effects
- Atmospheric aerosols and clouds
- Geophysics and Gravity Measurements
- Tropical and Extratropical Cyclones Research
- Atmospheric chemistry and aerosols
- GNSS positioning and interference
- Soil Moisture and Remote Sensing
- Air Quality and Health Impacts
- Hydrological Forecasting Using AI
- Wind and Air Flow Studies
- Advanced Computational Techniques and Applications
- Healthcare Systems and Challenges
- Clinical Nutrition and Gastroenterology
- Plant Ecology and Soil Science
- Energy Load and Power Forecasting
- Climate change and permafrost
- Air Quality Monitoring and Forecasting
- Tree-ring climate responses
- Flood Risk Assessment and Management
University of Hohenheim
2015-2024
National Institute of Meteorology
2011
Abstract Within the framework of international field campaign COPS (Convective and Orographically‐induced Precipitation Study), a large suite state‐of‐the‐art meteorological instrumentation was operated, partially combined for first time. This includes networks in situ remote‐sensing systems such as Global Positioning System well synergy multi‐wavelength passive active instruments advanced radar lidar systems. The phase performed from 01 June to 31 August 2007 low‐mountain area southwestern...
The Weather Research and Forecast (WRF) model with its land surface NOAH was set up applied as regional climate over Europe. It forced the latest ERA-interim reanalysis data from 1989 to 2008 operated 0.33° 0.11° resolution. This study focuses on verification of monthly seasonal mean precipitation Germany, where a high quality dataset German Service is available. In particular, studied in orographic terrain southwestern Germany dry lowlands northeastern Germany. both regions very important...
Abstract. This study investigates an extreme weather event that impacted the United Arab Emirates (UAE) in March 2016, using Weather Research and Forecasting (WRF) model version 3.7.1 coupled with its hydrological modeling extension package (WRF-Hydro). Six-hourly forecasted forcing records at 0.5∘ spatial resolution, obtained from National Center for Environmental Prediction (NCEP) Global Forecast System (GFS), are used to drive three nested downscaling domains of both standalone WRF...
Quantitative precipitation estimation and forecasting (QPE QPF) are among the most challenging tasks in atmospheric sciences. In this work, QPE based on numerical modelling data assimilation is investigated. Key components Weather Research Forecasting (WRF) model combination with its 3D variational scheme, applied convection-permitting scale sophisticated physics over central Europe. The system operated a 1-hour rapid update cycle processes large set of situ observations, from French radar...
Abstract In this paper we coupled a crop growth model to the Weather Research and Forecasting with its land surface Noah‐MP demonstrated influence of weather driven on land‐atmosphere (L‐A) feedback. An impact study was performed at convection permitting scale 3 km over Germany. While leaf area index (LAI) in control simulation same for all cropland grid cells, inclusion resulted heterogeneous development higher LAI stronger seasonality. For analyses L‐A coupling, two‐legged metric applied...
Abstract. Extreme precipitation is a weather phenomenon with tremendous damaging potential for property and human life. As the intensity frequency of such events projected to increase in warming climate, there an urgent need advance existing knowledge on extreme processes, statistics impacts across scales. To this end, working group within Germany-based project, ClimXtreme, has been established carry out multidisciplinary analyses high-impact events. In work, we provide comprehensive...
The Global Navigation Satellite System (GNSS) tropospheric gradients offer valuable information about how moisture is distributed in the atmosphere. These are determined by studying variations atmosphere refracts signals, which measured based on delays from satellites positioned at different angles. Zus et al. (2023) developed a gradient operator that has been added to Weather Research and Forecasting (WRF) model. Thundathil (2024) conducted several impact experiments showing promising...
Southern France is often affected by heavy-precipitation events (HPEs) leading to severe flooding in the regions of Occitanie, Provence-Alpes-Côte d'Azur, and Corsica. In many cases, these HPEs are triggered a strong south-easterly moisture transport from Mediterranean lower atmosphere (below 850 hPa). To date forecasting magnitude location challenging for numerical weather prediction models (NWP): false positive alarms as well negative need be minimized. We hypothesize that an...
Abstract The present study investigates the initiation of precipitating deep convection in an ensemble convection‐resolving mesoscale models. Results eight different model runs from five non‐hydrostatic models are compared for a case Convective and Orographically‐induced Precipitation Study (COPS). An isolated convective cell initiated east Black Forest crest southwest Germany, although available potential energy was only moderate inhibition high. Measurements revealed that, due to absence...
Abstract The unique combination of observing and modelling efforts during the Convective Orographically‐induced Precipitation Study (COPS) D‐PHASE (Demonstration Probabilistic Hydrological Atmospheric Simulation flood Events in alpine region) allows systematic evaluation models participating with observations collected COPS. This study verifies a subset COPS region, including convection‐permitting as well convection parametrization. Observations from Joint D‐PHASE/COPS (JDC) dataset are...
Abstract In this study, we present a five‐member Weather Research and Forecasting (WRF) physics ensemble over the Arabian Peninsula on convection‐permitting (CP) scale investigate ability to simulate convection precipitation by varying applied cloud microphysics planetary boundary layer (PBL) parametrizations. The study covers typical event ocurring during summertime eastern part of United Arab Emirates (UAE). Our results show that best are obtained using water‐ ice‐friendly aerosols...
Abstract. Effective numerical weather forecasting is vital in arid regions like the United Arab Emirates (UAE) where extreme events heat waves, flash floods, and dust storms are severe. Hence, accurate of quantities surface temperatures humidity very important. To date, there have been few seasonal-to-annual scale verification studies with WRF at high spatial temporal resolution. This study employs a convection-permitting (2.7 km grid scale) simulation Noah-MP, daily forecast mode, from 1...
Abstract. Potential for regional climate engineering is gaining interest as a means of solving environmental problems like water scarcity and high temperatures. In the hyper-arid United Arab Emirates (UAE), reaching crisis point due to consumption over-extraction being exacerbated by change. To counteract this problem, UAE has conducted cloud-seeding operations intensive desalination many years but now considering other increasing resources. Very large “artificial black surfaces” (ABSs),...
Abstract The impact of assimilating conventional and Global Positioning System (GPS) Zenith Total Delay (ZTD) data over France into the Weather Research Forecasting (WRF) model is investigated during COPS IOP 9c. A convection‐permitting horizontal resolution 3.6 km covering whole central Europe was chosen. Four different simulations were conducted to show influence observation types on forecast. Additionally, a comparison with models COSMO‐DE COSMO‐EU from German Meteorological Service (DWD)...
The impact of assimilating lower‐tropospheric lidar temperature profiles into a numerical weather prediction (NWP) model was investigated. were measured with the Temperature Rotational Raman Lidar (TRRL) University Hohenheim on 24 April 2013. day showed development typical daytime planetary boundary layer (PBL) no optically thick clouds. Weather Research and Forecasting (WRF) operated 57 vertical levels covering Central Europe 3 km horizontal resolution. Three different experiments carried...
Abstract. The quantification of land–atmosphere coupling strength is still challenging, particularly in the atmospheric segment local process chain. This part caused by a lack spatially comprehensive observations temperature and specific humidity which form verification basis for common process-based metrics. In this study, we aim at investigating where uncertainty moisture affects over Europe, how changes mean moisture, as well their vertical gradients, influence coupling. For purpose,...
The goal of the present study is to investigate variability simulated convective precipitation by three convection-resolving models using different set-ups and initial boundary conditions. COSMO, MM5 WRF have been used simulate atmospheric situation on 12 July 2006, when local convection occurred in central Europe under weak synoptic forcing. focus this investigation northern Black Forest South-West Germany. fields from nine model simulations differ considerably. Six capture character event....
Abstract Recent advances in technology permit the irrigation of dry, coastal areas, avoiding use fossil water and conflicts with other land (e.g., for food production). Consequently, it becomes reasonable to consider large-scale plantations mitigating increases atmospheric concentrations by carbon sequestration study local modifications weather climate. This work investigates impact Oman Sonora Desert Mexico assuming an area about 100 km × km. For this purpose, advanced surface–atmosphere...
A forward operator for Global Positioning System (GPS) slant total delay (STD) data and its adjoint were implemented into the Mesoscale Model version 5 (MM5) 4DVAR system to investigate impact on quantitative precipitation forecasting (QPF). An operational forecast was set up providing two forecasts per day, one driven by ECMWF only other additionally of GPS STD data.The investigation statistics August 2007 demonstrated a positive representation watervapour field diurnal cycle in southwest...
Abstract. Increasing computational resources and the demands of impact modelers, stake holders, society envision seasonal climate simulations with convection-permitting resolution. So far such a resolution is only achieved limited-area model whose results are impacted by zonal meridional boundaries. Here, we present setup latitude-belt domain that reduces disturbances originating from western eastern boundaries therefore allows for studying physical parameterization. The Weather Research...
The impact of assimilating thermodynamic profiles measured with lidars into the Weather Research and Forecasting (WRF)-Noah-Multiparameterization model system on a 2.5-km convection-permitting scale was investigated. We implemented new forward operator for direct assimilation water vapor mixing ratio (WVMR). Data from two lidar systems University Hohenheim were used: differential absorption (UHOH WVDIAL) temperature rotational Raman TRL). Six experiments conducted 1-hour cycles over 10-hour...
In the preparation for polarimetric radar data assimilation, it is essential to examine accuracy of forward operators based on different formulations. For this purpose, four that focus warm rain conditions are compared both with each other and actual observations respect their performance C-band dual radars. These mutually consider beam broadening climatological bending. The first operator derives parameters assuming an exponential raindrop size distribution obtained by models fitting...