A5060830810- Meteorological Phenomena and Simulations
- Atmospheric aerosols and clouds
- Wind and Air Flow Studies
- Climate variability and models
- Atmospheric chemistry and aerosols
- Atmospheric and Environmental Gas Dynamics
- Precipitation Measurement and Analysis
- Aeolian processes and effects
- Fluid Dynamics and Turbulent Flows
- Atmospheric Ozone and Climate
- Plant Water Relations and Carbon Dynamics
- Cryospheric studies and observations
- Tropical and Extratropical Cyclones Research
- Hydrology and Watershed Management Studies
- Oceanographic and Atmospheric Processes
- Remote Sensing and LiDAR Applications
- Groundwater and Isotope Geochemistry
- Landslides and related hazards
- Air Quality Monitoring and Forecasting
- Methane Hydrates and Related Phenomena
- Wind Energy Research and Development
- Ionosphere and magnetosphere dynamics
- Fire effects on ecosystems
- Geological Modeling and Analysis
- Urban Heat Island Mitigation
Karlsruhe Institute of Technology
2015-2024
Ludwig-Maximilians-Universität München
2021
German Center for Infection Research
2021
University of Hertfordshire
2019
National Institute of Meteorology
2008-2013
Institute of Medical Microbiology and Hygiene
2009
FZI Research Center for Information Technology
2009
Institute of Geodesy and Geophysics
2007
Arizona State University
2006
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 Convective Storm Initiation Project (CSIP) is an international project to understand precisely where, when, and how convective clouds form develop into showers in the mainly maritime environment of southern England. A major aim CSIP compare results very high resolution Met Office weather forecasting model with detailed observations early stages use newly gained understanding improve predictions model. large array ground-based instruments plus two instrumented aircraft, from U.K. National...
Abstract In the afternoon of 15 July 2007, a thunderstorm was initiated within line cumulus clouds which formed parallel to crest Black Forest mountains during Intensive Observation Period (IOP) 8b Convective and Orographically‐induced Precipitation Study (COPS). This paper extends analysis processes that led convection initiation (CI), i.e. transition from shallow deep convection, on this day with data several COPS instruments have not been considered in previous studies. particular,...
Precipitating convection in a mountain region of moderate topography is investigated, with particular emphasis on its initiation response to boundary-layer and mid-and upper-tropospheric forcing mechanisms.The data used the study are from COPS (Convective Orographically-induced Precipitation Study) that took place southwestern Germany eastern France summer 2007.It found precipitating can be roughly classified as being due either: (i) surface heating low-level flow convergence; (ii) moisture...
Horizontal gene transfer is a key step in the evolution of bacterial pathogens. Besides phages and plasmids, pathogenicity islands (PAIs) are subjected to horizontal transfer. The mechanisms PAIs within certain species or between different still not well understood. This study focused on High-Pathogenicity Island (HPI), which PAI widely spread among extraintestinal pathogenic Escherichia coli serves as model for general. We applied phylogenetic approach using multilocus sequence typing...
Abstract. Stable isotopes of water vapour are powerful indicators meteorological processes on a broad range scales, reflecting evaporation, condensation, and air mass mixing processes. With the recent advent fast laser-based spectroscopic methods, it has become possible to measure stable isotopic composition atmospheric in situ at high temporal resolution. Here we present results from such comprehensive airborne isotope measurements over western Mediterranean spatial Measurements have been...
Abstract. The HD(CP)2 Observational Prototype Experiment (HOPE) was performed as a major 2-month field experiment in Jülich, Germany, April and May 2013, followed by smaller campaign Melpitz, September 2013. HOPE has been designed to provide an observational dataset for critical evaluation of the new German community atmospheric icosahedral non-hydrostatic (ICON) model at scale simulations further information on land-surface–atmospheric boundary layer exchange, cloud precipitation processes,...
For the first time in Germany, we obtained high-resolution spatial distributions of particle numbers and nitrogen oxides an urban agglomeration using a tram system. In comparison to NOx concentration decreased much faster with significantly steeper gradient when going from inner city surrounding area. case decrease was 70% while for number it only 50%. We found area rural second increase without simultaneous enhanced levels. The source high could be ascribed industry emissions about 5–10 km...
With the increase of spatial resolution weather forecast models to order O(1 km), need for adequate observations model validation becomes evident.Therefore, we designed and constructed ''KITcube'', a mobile observation platform convection studies processes on meso-c scale.The KITcube consists in-situ remote sensing systems which allow measuring energy balance components Earth's surface at different sites; mean atmospheric conditions by radiosondes, GPS station, microwave radiometer;...
Abstract. A ground-based field campaign was conducted in southern West Africa from mid-June to the end of July 2016 within framework Dynamics–Aerosol–Chemistry–Cloud Interactions (DACCIWA) project. It aimed provide a high-quality comprehensive data set for process studies, particular interactions between low-level clouds (LLCs) and boundary-layer conditions. In this region missing observations are still major issue. During campaign, extensive remote sensing situ measurements were at three...
Abstract Dual-Doppler analysis of data from two coherent lidars during the Terrain-Induced Rotor Experiment (T-REX) allows retrieval flow structures, such as vortices, mountain-wave events. The spatial and temporal resolution this approach is sufficient to identify track vortical motions on an elevated, cross-barrier plane in clear air. Assimilation routines or additional constraints two-dimensional continuity are not required. A relatively simple quick least squares method forms basis...
Organized structures in turbulent flow fields are a well-known and still fascinating phenomenon. Although these so-called coherent obvious from visual inspection, quantitative assessment is challenge many aspects e.g., formation mechanisms contribution to fluxes, discussed controversially. During the "High Definition Clouds Precipitation for Advancing Climate Prediction" Observational Prototype Experiment (HOPE) April May 2013, an advanced dual Doppler lidar technique was used image...
In the region of Corsica located in western Mediterranean Sea, mean daily lightning activity as an indicator for deep convection late summer and autumn shows a distinct maximum mid‐afternoon secondary at night. During night, most is offshore near island's coastline. Currently there are no observational data which could be used to explain this nocturnal convection, but understanding its formation mechanism important accurately forecasting regional weather. article, we explore two possible...
Abstract. We present the first measurement of sensible heat flux (H) profile in convective boundary layer (CBL) derived from covariance collocated vertical-pointing temperature rotational Raman lidar and Doppler wind measurements. The uncertainties H measurements due to instrumental noise limited sampling are also discussed. Simultaneous latent (L) other turbulent variables were obtained with combination water-vapor differential absorption (WVDIAL) lidar. case study uses a example HOPE...
Abstract Modular Observation Solutions of Earth Systems (MOSES) is a novel observation system that specifically designed to unravel the impact distinct, dynamic events on long-term development environmental systems. Hydrometeorological extremes such as recent European droughts or floods 2013 caused severe and lasting damage. Modeling studies suggest abrupt permafrost thaw accelerate Arctic greenhouse gas emissions. Short-lived ocean eddies seem comprise significant share marine carbon uptake...
Wind is a core state variable of the atmosphere. Extending capabilities ground-based measurement systems, airborne Doppler lidar (ADL) onboard research aircraft allows for targeted and spatially resolved wind measurements, which are crucial localized severe weather events or in inaccessible regions such as over water complex terrain.A novel ADL system – AIRflows (‘AIRborne fixed-beam lidar for wind measurements‘)  –...
Abstract. Mineral dust particles emitted from dry, uncovered soil can be transported over vast distances, thereby influencing climate and environment. Its impacts are highly size-dependent, yet large with diameters dp > 10 μm remain understudied due to their low number concentrations instrumental limitations. Accurately characterizing the particle size distribution (PSD) at emission is crucial for understanding transport interactions. Here we characterize PSD an source during Jordan Wind...
Comprehensive measurements were carried out on the mountainous island of Corsica during Hydrological cycle in Mediterranean Experiment (HyMeX) field campaign 2012. Using data from an operational GPS network, radiosondes and microwave radiometers, we studied spatio‐temporal variability integrated water vapour (IWV) convection‐related parameters pre‐convective environment over island. The following spatial differences IWV evolution occurred frequently. In interior strongly increased around...
Abstract. Water in the atmosphere can exist solid, liquid or gas phase. At high humidities, if aerosol population remains constant, more water vapour will condense onto particles and cause them to swell, sometimes up several times their original size. This significant change size chemical composition is termed hygroscopic growth alters a particle's optical properties. Even unsaturated conditions, this direct effect, for example by increasing extinction of incoming sunlight. have an impact on...
Abstract. Wind profiling by Doppler lidar is common practice and highly useful in a wide range of applications. Airborne can provide additional insights relative to ground-based systems allowing for spatially distributed targeted measurements. Providing link between theory measurement, first large eddy simulation (LES)-based airborne simulator (ADLS) has been developed. Simulated measurements are conducted based on LES wind fields, considering the coordinate geometric transformations...
The research aircraft Dormer (DO) 128-6, call-sign D-IBUF, operated by the Institute of Flight Guidance and Control Technical University Braunschweig its scientific equipment is presented. aircraft's operational capabilities quality measurements meteorological parameters trace constituents in lower troposphere are discussed. Besides avionic instrumentation for VFR-flights (Visual Rules) IFR-flights (Instrument at low altitudes over complex terrain, there redundant sensors measurement wind,...
Abstract. In the spring of 2013, extensive measurements with multiple Doppler lidar systems were performed. The instruments arranged in a triangle edge lengths about 3 km moderately flat, agriculturally used terrain northwestern Germany. For 6 mostly cloud-free convective days, vertical velocity variance profiles calculated. Weighted-averaged surface fluxes proved to be more appropriate than data from individual sites for scaling profiles; but even then, scatter was larger statistical error....
Abstract Measurements of a convective storm cluster in the northern Black Forest southwest Germany have revealed development warm and dry downdraft under its anvil cloud that had an inhibiting effect on subsequent convection. These measurements were made 12 July 2006 as part field campaign Prediction, Identification Tracking Convective Cells (PRINCE) during which number new measurement strategies deployed. included collocation rotational Raman lidar Doppler summit highest mountain region...