A5071819817- Atmospheric chemistry and aerosols
- Air Quality and Health Impacts
- Atmospheric aerosols and clouds
- Atmospheric Ozone and Climate
- Air Quality Monitoring and Forecasting
- Odor and Emission Control Technologies
- Atmospheric and Environmental Gas Dynamics
- Groundwater and Isotope Geochemistry
- Environmental Policies and Emissions
- Soil and Water Nutrient Dynamics
- Energy and Environment Impacts
- Advanced Chemical Sensor Technologies
- Vehicle emissions and performance
- Peatlands and Wetlands Ecology
- Toxic Organic Pollutants Impact
- Isotope Analysis in Ecology
- Fire dynamics and safety research
- Mercury impact and mitigation studies
- Plant Ecology and Soil Science
- Marine and coastal ecosystems
- Indoor Air Quality and Microbial Exposure
- Nanoparticles: synthesis and applications
- COVID-19 impact on air quality
- Industrial Gas Emission Control
- Insect and Pesticide Research
Finnish Meteorological Institute
2015-2024
Colorado State University
2018
Atmospheric nucleation is the dominant source of aerosol particles in global atmosphere and an important player climatic effects. The key steps this process occur sub-2-nanometer (nm) size range, which direct size-segregated observations have not been possible until very recently. Here, we present detailed atmospheric nanoparticles clusters down to 1-nm mobility diameter. We identified three separate regimes below 2-nm diameter that build up a physically, chemically, dynamically consistent...
Abstract. Concentrations of 5 gases (HCl, HNO3, HONO, NH3, SO2) and 8 major inorganic ions in particles (Cl−, NO3−, SO42−, NH4+, Na+, K+, Mg2+, Ca2+) were measured with an online monitor MARGA 2S two size ranges, Dp <2.5 μm < 10 μm, Helsinki, Finland from November 2009 to May 2010. The results compared filter sampling, mass concentrations obtained particle number distributions, a conventional SO2 monitor. yielded lower than those analyzed the samples for most ions. Linear regression...
Abstract We present ambient observations of dimeric monoterpene oxidation products (C 16–20 H y O 6–9 ) in gas and particle phases the boreal forest Finland spring 2013 2014, detected with a chemical ionization mass spectrometer filter inlet for gases aerosols employing acetate iodide as reagent ions. These are among first online dual‐phase such dimers atmosphere. Estimated saturation concentrations 10 −15 to −6 µg m −3 (based on observed thermal desorptions group‐contribution methods)...
The chemical composition of PM2.5 was monitored simultaneously at two sites, one in a general area the city center and roadside, Hanoi, Vietnam, during August 2019–July 2020 using 220 daily (24 h) filter samples. PM mass, water soluble ions, trace elements, organic elemental carbon sugar anhydrides were measured. annual average concentrations, 49 46 μg m−3 traffic urban site, respectively, exceeded national (25 m−3) 2021 WHO limit values (5 m−3). Daily concentrations highest winter when...
Risk assessment of pesticide impacts on remote ecosystems makes use model-estimated degradation in air. Recent studies suggest these rates to be overestimated, questioning current regulation. Here, we investigated the concentrations 76 pesticides Europe at 29 rural, coastal, mountain, and polar sites during agricultural application season. Overall, 58 were observed European atmosphere. Low spatial variation 7 suggests continental-scale atmospheric dispersal. Based free tropospheric air...
Abstract. The first EMEP intensive measurement periods were held in June 2006 and January 2007. measurements aimed to characterize the aerosol chemical compositions, including gas/aerosol partitioning of inorganic compounds. program during these included daily or hourly secondary components, with additional elemental- organic carbon (EC OC) mineral dust PM1, PM2.5 PM10. These have provided extended knowledge regarding composition particulate matter temporal spatial variability PM, as well an...
This study addressed the scarcity of NH3 measurements in urban Europe and diverse monitoring protocols, hindering direct data comparison. Sixty-nine datasets from Finland, France, Italy, Spain, UK across various site types, including industrial (IND, 8), traffic (TR, 12), (UB, 22), suburban (SUB, regional background (RB, 15), are analyzed to this study. Among these, 26 sites provided 5, or more, years for time series analysis. Despite varied necessitating future harmonization, average...
Abstract. We studied the sources, compositions and size distributions of aerosol particles during long-range transport (LRT) PM2.5 episodes which occurred on 12–15 August, 26–28 August 5–6 September 2002 in Finland. Backward air mass trajectories, satellite detections fire areas dispersion modelling results indicate that emissions from wildfires Russia other Eastern European countries arrived Finland these episodes. Elemental analyses using scanning electron microscopy (SEM) coupled with...
There is increasing demand for renewable energy and the use of biodiesel in traffic a major option when implying this increment. We investigated toxicological activities particulate emissions from nonroad diesel engine, operated with conventional fuel (EN590), two biodiesels: rapeseed methyl ester (RME) hydrotreated fresh vegetable oil (HVO). The engine was all fuels either or without catalyst (DOC/POC). matter (PM(1)) samples were collected dilution tunnel high-volume cascade impactor...
Abstract. Climatic effects of newly-formed atmospheric secondary aerosol particles are to a large extent determined by their condensational growth rates. However, all the vapours condensing on nanoparticles and growing them climatically relevant sizes not identified yet particle phase processes rates poorly known. Besides sulfuric acid, organic compounds known contribute significantly nanoparticle growth. In this study model MABNAG (Model for Acid-Base chemistry in NAnoparticle Growth) was...
Abstract. New particle formation (NPF) provides a large source of atmospheric aerosols, which affect the climate and human health. In recent chamber studies, ion-induced nucleation (IIN) has been discovered as an important pathway forming particles; however, investigation remains incomplete. For this study, we investigated air anion compositions in boreal forest southern Finland for three consecutive springs, with special focus on H2SO4-NH3 clusters. We found that ratio between...
Abstract. We measured amines in boreal forest air Finland both gas and particle phases with 1 h time resolution using an online ion chromatograph (instrument for Measuring AeRosols Gases Ambient Air – MARGA) connected to electrospray ionization quadrupole mass spectrometer (MS). The developed MARGA-MS method was able separate detect seven different amines: monomethylamine (MMA), dimethylamine (DMA), trimethylamine (TMA), ethylamine (EA), diethylamine (DEA), propylamine (PA), butylamine (BA)....
Abstract. The Station for Measuring Ecosystem–Atmosphere Relations (SMEAR) II is well known among atmospheric scientists due to the immense amount of observational data it provides Earth–atmosphere interface. Moreover, SMEAR plays an important role large European research infrastructure, enabling scientific community tackle climate- and air-pollution-related questions, utilizing high-quality long-term sets recorded at site. So far, this well-documented site was missing description seasonal...
Abstract. Ammonia (NH3) in the atmosphere affects both environment and human health. It is therefore increasingly recognised by policy makers as an important air pollutant that needs to be mitigated, though it still remains unregulated many countries. In order understand effectiveness of abatement strategies, routine NH3 monitoring required. Current reference protocols, first developed 1990s, use daily samplers with offline analysis; however, there have been a number technologies since,...
Abstract. Measurements of total nitrogen and inorganic in precipitation samples from NitroEurope sites across Europe permit the calculation organic concentrations wet deposition, by difference. The contribution N to ranged only a few % around 40% 18 northern Finland Italy, similar results previous individual studies. This paper presents absolute relative contributions deposition Europe, examines seasonal trends. There were weak correlations with other solutes precipitation. These simple...
Aerosol hygroscopic properties were linked to its chemical composition by using complementary online mass spectrometric techniques in a comprehensive characterization study at rural mountaintop station central Germany August 2012. In particular, atmospheric pressure ionization spectrometry ((-)APCI-MS) provided measurements of organic acids, organosulfates, and nitrooxy-organosulfates the particle phase 1 min time resolution. Offline analysis filter samples enabled us determine molecular...
Abstract. Aerosol particles play an important role in the microphysics of clouds and hence their likelihood to precipitate. In changing climate already-dry areas such as United Arab Emirates (UAE) are predicted become even drier. Comprehensive observations daily seasonal variation aerosol particle properties locations required, reducing uncertainty predictions. We analyse from a 1-year measurement campaign at background location investigate this region, study impact boundary layer mixing on...