A5012256486- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Air Quality and Health Impacts
- Indoor Air Quality and Microbial Exposure
- Air Quality Monitoring and Forecasting
- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Infection Control and Ventilation
- Cyclone Separators and Fluid Dynamics
- Vehicle emissions and performance
- Aerosol Filtration and Electrostatic Precipitation
- Inhalation and Respiratory Drug Delivery
- Particle Dynamics in Fluid Flows
- Plant responses to elevated CO2
- Aeolian processes and effects
- Fire effects on ecosystems
- Plant Water Relations and Carbon Dynamics
- Tree-ring climate responses
- Coastal and Marine Dynamics
- Forest ecology and management
- Spectroscopy Techniques in Biomedical and Chemical Research
- Allergic Rhinitis and Sensitization
- Odor and Emission Control Technologies
- Methane Hydrates and Related Phenomena
- Environmental Policies and Emissions
Center for Physical Sciences and Technology
2014-2023
IMU Institut (Germany)
2015
Vilnius University
1993-2004
University of Cincinnati
1994-1998
Finnish Institute of Occupational Health
1996
Lithuanian Academy of Sciences
1989-1993
Abstract. Two years of harmonized aerosol number size distribution data from 24 European field monitoring sites have been analysed. The results give a comprehensive overview the near surface particle concentrations and distributions between 30 500 nm dry diameter. Spatial temporal aerosols in sizes most important for climate applications are presented. We also analyse annual, weekly diurnal cycles concentrations, provide log-normal fitting parameters median distributions, guidance notes...
Abstract. Atmospheric new particle formation (NPF) is an important phenomenon in terms of global number concentrations. Here we investigated the frequency NPF, rates 10 nm particles, and growth size range 10–25 using at least 1 year aerosol size-distribution observations 36 different locations around world. The majority these measurement sites are Northern Hemisphere. We found that NPF has a strong seasonal variability. At analyzed this study, occurs most frequently March–May (on about 30 %...
Microbial stress due to the impaction of microorganisms onto an agar collection surface was studied experimentally. The relative recovery rates aerosolized Pseudomonas fluorescens and Micrococcus luteus were determined as a function velocity by using moving slide impactor operating over flow rate range from 3.8 40 liters/min yielding velocities 24 250 m/s. As reference, sixth stage Andersen Six-Stage Viable Particle Sizing Sampler used at its 28.3 (24 m/s). At efficiency close 100% for...
Bacterial agents and cell components can be spread as bioaerosols, producing infections asthmatic problems. This study compares four methods for the detection enumeration of aerosolized bacteria collected in an AGI-30 impinger. Changes total viable concentrations Pseudomonas fluorescens collection fluid with respect to time impingement were determined. Two direct microscopic (acridine orange BacLight) aerodynamic aerosol-size spectrometry (Aerosizer) employed measure bacterial impinger air,...
Abstract. Many of the next generation global climate models will include aerosol schemes which explicitly simulate microphysical processes that determine particle size distribution. These enable optical properties and cloud condensation nuclei (CCN) concentrations to be determined by fundamental processes, should lead a more physically based simulation direct indirect radiative forcings. This study examines variation in distribution simulated 12 microphysics quantify model diversity identify...
Abstract. This paper presents the light-scattering properties of atmospheric aerosol particles measured over past decade at 28 ACTRIS observatories, which are located mainly in Europe. The data include particle light scattering (σsp) and hemispheric backscattering (σbsp) coefficients, Ångström exponent (SAE), backscatter fraction (BF) asymmetry parameter (g). An increasing gradient σsp is observed when moving from remote environments (arctic/mountain) to regional urban environments. At a...
Abstract. The widespread use of Aerodyne aerosol mass spectrometers (AMS) has greatly improved real-time organic (OA) monitoring, providing spectra that contain sufficient information for source apportionment. However, AMS field deployments remain expensive and demanding, limiting the acquisition long-term datasets at many sampling sites. offline application spectrometry entailing analysis nebulized water extracted filter samples (offline-AMS) increases spatial coverage accessible to...
ABSTRACT The collection efficiency of liquid impingers was studied experimentally as a function the sampling flow rate with test particles in bacterial size range. Three were tested: two All-Glass Impingers (AGI-4 and AGI-30), widely used for bioaerosol sampling, newly developed slot impinger. aerosol generated by Collison nebulizer, an Aerosizer to measure particle concentrations distributions upstream downstream each effect air pressure drop across impinger on performance investigated,...
Abstract The changes in the physical collection efficiencies of all-glass impingers were studied experimentally with an aerodynamic particle sizer by dynamically measuring concentrations upstream and downstream AGI-4 AGI-30 impingers. Monodisperse PSL particles sizes ranging from 0.3 to 2.0 μm used tests. inner diameter impingement nozzle was found be most critical dimension affecting efficiency. Significant variations performance individual due dimensions tested. About 1% initial amount...
This study investigated bacterial penetration of different shapes, aerodynamic sizes, and flow rates through a surgical mask dust/mist respirator. The penetrations were compared with those spherical corn oil particles the same diameter tested under conditions. tests performed at levels aerosol penetration. Bacteria, ranging from to rod-shaped high aspect (length width) ratio, selected as test agents. Among these, Pseudomonas fluorescens physically simulates Mycobacterium tuberculosis by...
Abstract. Cluster~analysis of particle number size distributions from~background sites across Europe~is presented. This generated a total nine clusters which could be further combined into two main groups, namely: south-to-north category (four clusters) and west-to-east (five clusters). The first group was identified as most frequently being detected inside around northern Germany neighbouring countries, showing clear evidence local afternoon nucleation growth events that linked to movement...
Abstract. In early spring the Baltic region is frequently affected by high-pollution events due to biomass burning in that area. Here we present a comprehensive study investigate impact of biomass/grass (BB) on evolution and composition aerosol Preila, Lithuania, during springtime open fires. Non-refractory submicron particulate matter (NR-PM1) was measured an Aerodyne chemical speciation monitor (ACSM) source apportionment with multilinear engine (ME-2) running positive matrix factorization...
ABSTRACT Many commercially available devices initially developed for dispersion of biologically inert particles have been adopted aerosolization microoganisms in laboratory settings. However, these are not always adequate microbial particles, as they do simulate natural release into air. Wet methods appropriate viruses and most bacteria, whereas dry more suitable fungal actinomycete spores. Characteristics the resulting aerosol dependent on dispersing shear forces sensitivity agglomeration...
Trajectory cluster analysis and source-receptor models (the potential source contribution function (PSCF), concentration weighted trajectories (CWT), trajectory apportionment (TSA)) were applied to investigate the relationship for aerosol black carbon (BC) measured at coastal site (Preila, 55.55°N, 21.04°E) during 2013. The main sources paths of advection south-eastern Baltic region its relation identified. 72 h backward air masses arriving Preila from January December 2013 determined...
Abstract. Atmospheric new particle formation (NPF) is an important phenomenon in terms of the global number concentrations. Here we investigated frequency NPF, rates 10 nm particles and growth size range 10–25 using at least one year aerosol size-distribution observations 36 different locations around world. The majority these measurement sites are Northern Hemisphere. We found that NPF has a strong seasonal variability, taking place on about 30 % days March–May December–February. median...
The responses of airborne fungi to UV-B under natural conditions were investigated at the coastal station in Preila, Lithuania. Results this investigation demonstrated that solar radiation has a marked lethal effect on outdoor fungi. Sensitivity was highest for fungal propagules collected late evening (relative recovery 6.2%) and early morning (25.3%). lowest sensitivity observed midday (50.0%) afternoon (53.0%). reason is thought be elimination sensitive fraction night-time populations as...
ABSTRACT A new aerosol generator is introduced in which particles suspended a liquid are aerosolized by gentle bubble bursting. Tangential injection of dry air to the bubbling surface dries airborne droplets immediately after aerosolization so that they rapidly shrink size and carried out from inward upward swirling motion. The has been evaluated with monodisperse PSL range 0.73–5.1 μm saline solution using time-of-flight aerodynamic particle spectrometer (Aerosizer). It was found that,...
The process of nanoparticle generation during nanosecond and picosecond laser ablation various metals (Ni, Al, W, stainless steel) in ambient air argon gas was investigated.The number concentration nanoparticles generated by up to 100 times higher compared that air.Three stable separate size peaks nucleation, Aitken, accumulation modes were observed case gas, while particles a wide spectrum (8-200 nm) generated.The natural precursors can have an effect on the composed chemical compounds with...