A5080489730- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Air Quality and Health Impacts
- Atmospheric Ozone and Climate
- Aeolian processes and effects
- Vehicle emissions and performance
- Astro and Planetary Science
- Electron and X-Ray Spectroscopy Techniques
- Air Quality Monitoring and Forecasting
- Planetary Science and Exploration
- Ion-surface interactions and analysis
- Aerosol Filtration and Electrostatic Precipitation
- High-pressure geophysics and materials
- Heavy metals in environment
- X-ray Spectroscopy and Fluorescence Analysis
- Icing and De-icing Technologies
- Atmospheric and Environmental Gas Dynamics
- Geochemistry and Geologic Mapping
- Ionosphere and magnetosphere dynamics
- nanoparticles nucleation surface interactions
- Particle Dynamics in Fluid Flows
- Geological and Geochemical Analysis
- Occupational and environmental lung diseases
- Heavy Metal Exposure and Toxicity
- Mercury impact and mitigation studies
Technical University of Darmstadt
2014-2024
National Institute of Occupational Health
2017-2024
Cambridge University Press
2023
New York University Press
2023
657 Oslo
2019
Darmstadt University of Applied Sciences
1994-1997
California Institute of Technology
1994
Max Planck Institute for Chemistry
1993
University of Göttingen
1992
Max Planck Society
1990
During the SAMUM 2006 field campaign in southern Morocco, physical and chemical properties of desert aerosols were measured. Mass concentrations ranging from 30μgm−3 for PM2.5 under background conditions up to 300 000μgm−3 total suspended particles (TSP) during moderate dust storms TSP are correlated with local wind speed, whereasPM10 andPM2.5 determined by advection distant sources. Size distributions measured diameter between 20 nm 500μm (parametrizations given). Two major regimes size...
Abstract. This paper presents a review of recently acquired knowledge on the physico-chemical properties mineral dust from Africa and Asia based data presented discussed during Third International Dust Workshop, held in Leipzig (Germany) September 2008. Various regional field experiments have been conducted last few years, mostly close to source regions or after short-range transport. Although significant progress has made characterising variability regions, particular mineralogy iron...
Abstract. Airborne lidar and in-situ measurements of aerosols trace gases were performed in volcanic ash plumes over Europe between Southern Germany Iceland with the Falcon aircraft during eruption period Eyjafjalla volcano 19 April 18 May 2010. Flight planning measurement analyses supported by a refined Meteosat product trajectory model analysis. The plume was observed directly up to distance 2700 km downwind, 120 h ages. Aged layers few 100 m 3 deep, occurred 1 7 altitude, typically 300...
A large field experiment of the Saharan Mineral Dust Experiment (SAMUM) was performed in Praia, Cape Verde, January and February 2008. The aerosol at Praia is a superposition mineral dust, sea-salt, sulphates soot. Particles smaller than 500 nm are mainly dust–sulphate mixtures, soot–sulphate mixtures. larger then 2.5μm consist sea-salt few transition range exists between. major internal mixtures soot–sulphate. dust–sea-salt occur occasionally, dust–soot were not observed. aspect ratio...
The ice nucleation properties of the nine most abundant minerals occurring in desert aerosols (quartz, albite, microcline, kaolinite, montmorillonite, illite, calcite, gypsum, and hematite) were investigated by environmental scanning electron microscopy (ESEM). In this instrument, pure are exposed to water vapor at variable pressures temperatures. crystallization on mineral particles is observed secondary imaging, supersaturation for an activated particle fraction 1–3% determined as function...
The Saharan Mineral Dust Experiment (SAMUM) was conducted in May and June 2006 Tinfou, Morocco. A H-TDMA system a H-DMA-APS were used to obtain hygroscopic properties of mineral dust particles at 85% RH. Dynamic shape factors 1.11, 1.19 1.25 determined for the volume equivalent diameters 720, 840 960 nm, respectively.During event, hydrophobic number fraction 250 350 nm increased significantly from 30 65% 53 75%, respectively, indicating that can be as small 200 diameter. Lognormal functions...
In situ measurements of optical and physical properties mineral dust were performed at the outskirts Saharan Desert in framework Mineral Dust Experiment part 1 (SAMUM-1). Goals field study to achieve information on extent composition particle size distribution ground. For number distribution, measured with a DMPS/APS, dependent dynamic shape factor was considered. The mean refractive index particles this is 1.53–4.1 × 10-3i 537 nm wavelength 1.53–3.1 637 derived from scattering absorption...
A large field experiment of the Saharan Mineral Dust Experiment (SAMUM) was performed in Praia, Cape Verde, January and February 2008. This work reports on aerosol mass concentrations, size distributions mineralogical composition arriving at Praia. Three dust periods were recorded during measurements, divided by transitional embedded maritime-influenced situations. The total suspended particle mass/PM<sub>10</sub>/PM<sub>2.5</sub> 250/180/74μg/m<sup>3</sup> average for first period (17–21...
A ground-based sampling system named Ice-CVI is introduced that able to extract small ice particles with sizes between 5 and 20 μ m out of mixed-phase clouds. The instrument based on a counterflow virtual impactor (CVI) removing interstitial supplemented by additional modules pre-segregate other constituents Ice smaller are expected grow only water vapor diffusion there negligible probability they scavenge aerosol impaction riming. Thus, their residuals which released the can be interpreted...
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...
Abstract. The microphysical properties, composition and mixing state of mineral dust, sea salt secondary compounds were measured by active passive aerosol sampling, followed electron microscopy X-ray fluorescence in the Caribbean marine boundary layer. Measurements carried out at Ragged Point, Barbados during June–July 2013 August 2016. Techniques are presented evaluated, which allow for statements on atmospheric concentrations based collected samples. It became obvious that diameter range...
Lead is a non-essential toxic trace element. in blood (BPb) the most common biomarker of lead exposure but urine (UPb) has also been used. There is, however, limited data on variability UPb general population and association with BPb.Our aims were to assess repeated samples. The diurnal variation was examined as well associations BPb.We established an openly available biobank including 60 healthy non-smoking individuals, 29 men 31 women, 21-64 years age (median years), sampling urine. Timed...
During the Lindenberger Aerosol Characterization Experiment (LACE 98), impactor sampling of aerosol particles in size range 0.1 to 25 μm was performed. The atmospheric concentrations elements sodium lead (11 ≤ Z 83) were determined by total reflection X‐ray fluorescence analysis. Approximately 15,500 individual examined high‐resolution scanning electron microscopy and energy‐dispersive microanalysis, about 3800 transmission combined with microanalysis. On basis morphology chemical...
During the second Saharan Mineral Dust Experiment (SAMUM-2) field campaign, particles with geometric diameters (d) between ∼0.1 and 25 μm were collected on board of Deutsches Zentrum f¨ur Luft- und Raumfahrt (German Aerospace Center, DLR) Falcon aircraft. Size, chemical composition mixing state aerosols sampled (spatially vertically resolved) along theWest African coastline in Cape Verde Islands region determined by electron microscopy. A pronounced layer structure biomass-burning aerosol...