A5060705912- Atmospheric chemistry and aerosols
- Air Quality and Health Impacts
- Atmospheric aerosols and clouds
- Air Quality Monitoring and Forecasting
- Atmospheric Ozone and Climate
- Aeolian processes and effects
- Plant responses to elevated CO2
- Vehicle emissions and performance
- Coagulation and Flocculation Studies
- Fullerene Chemistry and Applications
- nanoparticles nucleation surface interactions
- Atmospheric and Environmental Gas Dynamics
- Carbon Nanotubes in Composites
- Cyclone Separators and Fluid Dynamics
- Iron oxide chemistry and applications
- Aerosol Filtration and Electrostatic Precipitation
- Minerals Flotation and Separation Techniques
- Laser-Ablation Synthesis of Nanoparticles
- Nanoparticle-Based Drug Delivery
- Forest Insect Ecology and Management
- Thermochemical Biomass Conversion Processes
- Fire effects on ecosystems
- Insect and Pesticide Research
- Catalytic Processes in Materials Science
- Combustion and flame dynamics
University of Eastern Finland
2014-2025
Finland University
2010-2022
Finnish Meteorological Institute
2010
Tampere University
2010
VTT Technical Research Centre of Finland
1992-2000
Abstract. We present comprehensive results on continuous atmospheric cluster and particle measurements in the size range ~1–42 nm within European Integrated project Aerosol Cloud Climate Air Quality interactions (EUCAARI) project. focused characterizing spatial temporal variation of new formation events relevant parameters across Europe. Different types air ion mobility spectrometers were deployed at 12 field sites Europe from March 2008 to May 2009. The conducted a wide variety...
Atmospheric nucleation events have received increasing attention as a potentially important source of aerosol particles affecting climate and human health. Here, we report 2.5 years continuous observations from San Pietro Capofiume, Italy (44°39′N, 11°37′W). We show that occur frequently in the Po Valley region, even though region is rather polluted with high pre‐existing particle concentrations. The are often very intensive, newly formed can grow to sizes large 100–200 nm diameter within...
Abstract. Aerosol physical and chemical properties trace gas concentrations were measured during the QUEST field campaign in March–April 2003, Hyytiälä, Finland. Our aim was to understand role of oxidation products VOC's such as mono- sesquiterpenes atmospheric nucleation events. Particle compositions using Aerodyne Mass Spectrometer, aerosol samples collected with low-pressure impactors a high volume sampler analysed number techniques. The results indicate that after new particle formation,...
Abstract. Aerosol number distribution measurements are reported at San Pietro Capofiume (SPC) station (44°39' N, 11°37' E) for the time period 2002–2005. The is located in Po Valley, largest industrial, trading and agricultural area Italy with a high population density. New particle formation was studied based on observations of size distribution, meteorological gas phase parameters. nucleation events were classified according to event clarity concentrations, growth rates. Out total 769...
[1] Relative humidity (RH) has been observed to be anticorrelated with continental new particle formation. Several reasons have proposed for this rather surprising finding, but no firm conclusions drawn so far. Here we study several of the reasons: Enhanced coagulational scavenging sub-3 nm clusters at high RH, diminished solar radiation RH leading gas phase oxidation chemistry, and increased condensation sink (CS) condensable gases due hygroscopic growth preexisting particles. Our...
The importance of nanotechnologies and engineered nanoparticles has grown rapidly. It is therefore crucial to acquire up-to-date knowledge the possible harmful health effects these materials. Since a multitude different types nanosized titanium dioxide (TiO2) particles are used in industry, we explored their inflammatory potential using mouse cell models. BALB/c mice were exposed by inhalation for 2 h, h on 4 consecutive days, or days weeks several commercial TiO2 nanoparticles, SiO2...
Abstract. Gaseous sulphuric acid is a key precursor for new particle formation in the atmosphere. Previous experimental studies have confirmed strong correlation between number concentrations of freshly formed particles and ambient acid. This study evaluates body gas phase concentrations, as measured by Chemical Ionization Mass Spectrometry (CIMS) during six intensive measurement campaigns one long-term observational period. The campaign datasets were Hyytiälä, Finland, 2003 2007, San Pietro...
Abstract. In this study the ion production rates in a boreal forest were studied based on two different methods: 1) cluster and particle concentration measurements, 2) external radiation radon measurements. Both methods produced reasonable estimates for rates. The average rate calculated from aerosol size distribution air mobility measurements was 2.6 pairs cm-3s-1, 4.5 cm-3s-1. first method gave lower values especially during day. A possible reason is that started only 3nm, so sink of small...
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...
Copyright 2014 American Association for Aerosol Research
Abstract. In anthropogenically influenced atmospheres, sulphur dioxide (SO2) is the main precursor of gaseous sulphuric acid (H2SO4), which in turn a for atmospheric particle nucleation. As result socio-economic changes, East Germany has seen dramatic decrease anthropogenic SO2 emissions between 1989 and present, as documented by routine air quality measurements many locations. We have attempted to evaluate influence changing concentrations on frequency intensity new formation (NPF) using...
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. Large-scale atmospheric models, which typically describe secondary organic aerosol (SOA) formation based on chamber experiments, tend to systematically underestimate observed burdens. Since SOA constitutes a significant fraction of aerosol, this discrepancy translates into an underestimation contribution radiative forcing aerosol. Here we show that the yields can be partly explained by wall losses forming compounds during experiments. We present experiment where α-pinene and ozone...
Abstract. We present the first laboratory experiments of aerosol formation from oxidation volatile organic species emitted by living plants, a process which for half century has been known to take place in atmosphere. have treated white cabbage plants with methyl jasmonate order induce production monoterpenes and certain less-volatile sesqui- homoterpenes. Ozone was introduced into growth chamber were placed, subsequent aerosols monitored measuring particle size distributions continuously...
Abstract. Newly-formed nanometer-sized particles have been observed at coastal and marine environments world wide. Organic species so far not detected in those newly-formed nucleation mode particles. In this study, we applied the ultrafine organic tandem differential mobility analyzer method to study possible existence of an fraction recently formed (d<20 nm) Mace Head research station. Furthermore, effects events on potential cloud condensation nuclei were studied. The typical for region...
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. Boreal forests are a major source of climate-relevant biogenic secondary organic aerosols (SOAs) and will be greatly influenced by increasing temperature. Global warming is predicted to not only increase emissions reactive volatile compounds (BVOCs) from vegetation directly but also induce large-scale insect outbreaks, which significantly BVOCs. Thus, climate change factors could substantially accelerate the formation SOAs in troposphere. In this study, we have combined results...
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. As part of the OSOA (Origin and formation Secondary Organic Aerosols) project, two intensive field campaigns were conducted in Melpitz, Germany Hyytiälä, Finland. This paper gives an overview measurements made during Hyytiälä campaign, which was held between 1 16 August 2001. Various instrumental techniques used to achieve physical chemical characterisation aerosols investigate possible precursor gases. During campaign particle observed on three consecutive days at beginning (1 3...
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...