A5019901029- Atmospheric chemistry and aerosols
- Air Quality and Health Impacts
- Atmospheric aerosols and clouds
- Air Quality Monitoring and Forecasting
- Atmospheric Ozone and Climate
- Vehicle emissions and performance
- Aeolian processes and effects
- Atmospheric and Environmental Gas Dynamics
- Fire effects on ecosystems
- Fire dynamics and safety research
- Remote Sensing in Agriculture
- Solar Radiation and Photovoltaics
- Geochemistry and Geologic Mapping
- Cyclone Separators and Fluid Dynamics
- Occupational and environmental lung diseases
- Indoor Air Quality and Microbial Exposure
- COVID-19 diagnosis using AI
- Radiomics and Machine Learning in Medical Imaging
- Radioactivity and Radon Measurements
- Aerosol Filtration and Electrostatic Precipitation
- Combustion and Detonation Processes
- Allergic Rhinitis and Sensitization
- Artificial Intelligence in Healthcare
- Toxic Organic Pollutants Impact
- Plant responses to elevated CO2
Finnish Meteorological Institute
2020-2024
University of Eastern Finland
2015-2024
Finland University
2020
North-West University
2011-2017
Paul Scherrer Institute
2013
<strong class="journal-contentHeaderColor">Abstract.</strong> This paper evaluates the current status of global modeling organic aerosol (OA) in troposphere and analyzes differences between models as well observations. Thirty-one chemistry transport (CTMs) general circulation (GCMs) have participated this intercomparison, framework AeroCom phase II. The simulation OA varies greatly terms magnitude primary emissions, secondary (SOA) formation, number species used (2 to 62), complexity...
Abstract. Organic aerosols (OA) represent one of the major constituents submicron particulate matter (PM1) and comprise a huge variety compounds emitted by different sources. Three intensive measurement field campaigns to investigate aerosol chemical composition all over Europe were carried out within framework European Integrated Project on Aerosol Cloud Climate Air Quality Interactions (EUCAARI) Monitoring Evaluation Programme (EMEP) during 2008 (May–June September–October) 2009...
Abstract In the atmosphere nighttime removal of volatile organic compounds is initiated to a large extent by reaction with nitrate radical (NO 3 ) forming nitrates which partition between gas and particulate phase. Here we show based on particle phase measurements performed at suburban site in Netherlands that contribute substantially mass. Comparisons chemistry transport model indicate most measured are formed NO oxidation. Using aerosol composition data from three intensive observation...
Primary and secondary aerosol particles originating from biomass burning contribute significantly to the atmospheric budget thereby both direct indirect radiative forcing. Based on detailed measurements of a large number plumes variable age in southern Africa, we show that size distribution, chemical composition, single-scattering albedo, hygroscopicity change considerably during first 2–4 h their transport. These changes, driven by oxidation subsequent formation, may reach factor 6 for...
Secondary organic aerosols (SOA) are large contributors to fine-particle loadings and radiative forcing but often represented crudely in global models. We have implemented three new detailed SOA treatments within the Community Atmosphere Model version 5 (CAM5) that allow us compare semivolatile versus nonvolatile (based on some of latest experimental findings) investigate effects gas-phase fragmentation reactions. The also track from biomass burning biofuel, fossil fuel, biogenic sources....
Abstract. Measurements of size-resolved cloud condensation nuclei (CCN) concentrations, subsaturated hygroscopic growth, size distribution, and chemical composition were collected from March through May, 2007, in the remote Boreal forests Hyytiälä, Finland, as part European Integrated project on Aerosol Cloud Climate Air Quality Interactions (EUCAARI) campaign. Hygroscopicity parameter, κ, distributions derived independently Continuous Flow-Streamwise Thermal Gradient CCN Chamber (CFSTGC)...
South Africa has the largest industrialised economy in Africa, with significant mining and metallurgical activities. A large fraction of African mineral assets is concentrated Bushveld Igneous Complex (BIC), western limb being most exploited. Because majority world's platinum produced BIC, this area also international interest. There are some indications that BIC should be considered an air pollution hotspot; however, inadequate data exist to substantiate these claims scientifically. To...
Abstract. Organic aerosols (OA) derived from small-scale wood combustion emissions are not well represented by current inventories and models, although they contribute substantially to the atmospheric particulate matter (PM) levels. In this work, a 29 m3 smog chamber in ILMARI facility of University Eastern Finland was utilized investigate formation secondary organic aerosol (SOA) modern masonry heater commonly used northern Europe. Emissions were oxidatively aged for variety dark (i.e., O3...
Abstract. Southern Africa is a significant source region of atmospheric pollution, yet long-term data on pollutant concentrations and properties from this are rather limited. A recently established measurement station in South Africa, Welgegund, strategically situated to capture regional background concentrations, as well emissions the major regions interior Africa. We measured non-refractive submicron aerosols (NR-PM1) black carbon over one year period investigated seasonal diurnal patterns...
Residential wood combustion (RWC) emits high amounts of volatile organic compounds (VOCs) into ambient air, leading to formation secondary aerosol (SOA), and various health climate effects. In this study, the emission factors VOCs from a logwood-fired modern masonry heater were measured using Proton-Transfer-Reactor Time-of-Flight Mass Spectrometer. Next, aged in 29 m3 Teflon chamber equipped with UV black lights, where dark photochemical atmospheric conditions simulated. The main...
Abstract. The assessment of the climatic impacts and adverse health effects atmospheric aerosol particles requires detailed information on particle properties. However, very limited is available morphology phase state secondary organic (SOA) particles. physical greatly affects particulate-phase chemical reactions, thus growth rates newly formed aerosol. Thus verifying SOA gives new important insight into their formation, subsequent growth, consequently potential impacts. According to our...
Abstract. An Aerodyne quadrupole aerosol mass spectrometer (Q-AMS) was deployed in Hyytiälä, a forested rural measurement site southern Finland, during 2-week campaign spring 2005. Q-AMS measures concentrations of non-refractory species including sulphate, nitrate, ammonium and organics from submicron particles. A positive matrix factorization method used identifying two oxygenated organic (OOA) groups the measured total mass. The properties these were estimated their diurnal concentration...
Abstract. A detailed three-dimensional regional chemical transport model (Particulate Matter Comprehensive Air Quality Model with Extensions, PMCAMx) was applied over Europe, focusing on the formation and transformation of organic matter. Three periods representative different seasons were simulated, corresponding to intensive field campaigns. An extensive set AMS measurements used evaluate and, using factor-analysis results, gain more insight into sources transformations aerosol (OA)....
Abstract. Atmospheric lidar measurements were carried out at Elandsfontein measurement station, on the eastern Highveld approximately 150 km east of Johannesburg in South Africa throughout 2010. The height planetary boundary layer (PBL) top was continuously measured using a Raman lidar, PollyXT (POrtabLe Lidar sYstem eXTended). High atmospheric variability together with large surface temperature range and significant seasonal changes precipitation observed, which had an impact vertical...
Abstract. Biogenic volatile organic compounds (VOCs) are a significant source of global secondary aerosol (SOA); however, quantifying their forming potential remains challenge. This study presents smog chamber laboratory work, focusing on SOA formation via oxidation the emissions two dominant tree species from boreal forest area, Scots pine (Pinus sylvestris L.) and Norway spruce (Picea abies), by hydroxyl radical (OH) ozone (O3). Oxidation α-pinene was also studied as reference system....
Abstract. The study investigates the sources of fine organic aerosol (OA) in boreal forest, based on measurements including both filter sampling (PM1) and online methods carried out during a one-month campaign held Hyytiälä, Finland, spring 2007. Two mass spectrometers (Q-AMS, ToF-AMS) were employed to measure on-line concentrations major non-refractory species, while water extracts samples analyzed by nuclear magnetic resonance (NMR) spectroscopy for functional group characterization polar...
Abstract. In this paper we introduce new in situ observations of atmospheric aerosols, especially chemical composition, physical and optical properties, on the eastern brink heavily polluted Highveld area South Africa. During observation period between 11 February 2009 31 January 2011, mean particle number concentration (size range 10–840 nm) was 6310 cm3 estimated volume sub-10 μm particles 9.3 μm3 m−3. The aerosol absorption scattering coefficients at 637 nm were 8.3 Mm−1 49.5 Mm−1,...
Effective density (ρeff) is an important property describing particle transportation in the atmosphere and human respiratory tract. In this study, size dependency of ρeff was determined for fresh photochemically aged particles from residential combustion wood logs brown coal, as well aerosol standard (CAST) burner. increased considerably due to photochemical aging, especially soot agglomerates larger than 100 nm mobility diameter. The increase depends on presence condensable vapors...
Abstract. Measurements of particle formation following the gas phase oxidation volatile organic compounds (VOCs) emitted by Scots pine (Pinus sylvestris L.) seedlings are reported. Particle and condensational growth both from ozone (O3) hydroxyl radical (OH) initiated emissions (about 20-120 ppb) were investigated in a smog chamber. During experiments, tetramethylethylene (TME) 2-butanol added to control concentrations O3 OH. rates interpreted with chemical kinetic model. mainly included...
Abstract. Aromatic hydrocarbons are associated with direct adverse human health effects and can have negative impacts on ecosystems due to their toxicity, as well indirect through the formation of tropospheric ozone secondary organic aerosol, which affect health, crop production regional climate. Measurements aromatic were conducted at Welgegund measurement station (South Africa), is considered be a regionally representative background site. However, site occasionally impacted by plumes from...
Abstract Active vegetation fires in south‐eastern (SE) Europe resulted a notable increase the number concentration of aerosols and cloud condensation nuclei (CCN) particles at two high latitude locations—the SMEAR IV station Kuopio, Finland, Zeppelin Observatory Svalbard, Arctic. During fire episode aerosol hygroscopicity κ slightly increased decreased. Despite CCN conditions IV, activation diameter due to decreased supersaturation with an loading. In addition, during episode, situ measured...
Abstract. South Africa holds significant mineral resources, with a substantial fraction of these reserves occurring and being processed in large geological structure termed the Bushveld Igneous Complex (BIC). The area is also highly populated by informal, semi-formal formal residential developments. However, knowledge air quality research related to atmosphere still very limited area. In order investigate characteristics processes affecting sub-micron particle number concentrations formation...
The effective density of fine particles emitted from small-scale wood combustion various fuels were determined with a system consisting an aerosol particle mass analyzer and scanning mobility sizer (APM-SMPS). A novel sampling chamber was combined to the enable measurements highly fluctuating processes. In addition, mass-mobility exponents (relates size) data describe shape particles. Particle size, type fuel, phase, conditions found have effect on shape. For example, steady phase produced...
Abstract. After carbon dioxide (CO2), aerosol black (BC) is considered to be the second most important contributor global warming. This paper presents equivalent (eBC) (derived from an optical absorption method) data collected three sites in interior of South Africa where continuous measurements were conducted, i.e. Elandsfontein, Welgegund and Marikana, as well elemental (EC) (determined by evolved at five samples once a month on filter analysed offline, Louis Trichardt, Skukuza, Vaal...