A5013857982- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Air Quality and Health Impacts
- Atmospheric Ozone and Climate
- Research Data Management Practices
- Scientific Computing and Data Management
- Air Quality Monitoring and Forecasting
- Atmospheric and Environmental Gas Dynamics
- Wind and Air Flow Studies
- Data Quality and Management
- Environmental Monitoring and Data Management
- Distributed and Parallel Computing Systems
- Library Science and Information Systems
- Vehicle emissions and performance
- Meteorological Phenomena and Simulations
- International Science and Diplomacy
- Advanced Database Systems and Queries
- Semantic Web and Ontologies
- Fire effects on ecosystems
- Time Series Analysis and Forecasting
- Geographic Information Systems Studies
- Environmental Science and Water Management
- Hydrocarbon exploration and reservoir analysis
- 3D Modeling in Geospatial Applications
- Indoor Air Quality and Microbial Exposure
Association des Operateurs Postaux Publics Europeens
2023-2024
University of Helsinki
2013-2023
Research Data Alliance
2022
Helsinki Institute of Physics
1999-2018
Inwood Community Services
2018
Centre National de la Recherche Scientifique
2011-2013
Université Clermont Auvergne
2012-2013
Laboratoire de Glaciologie et Géophysique de l’Environnement
2012
Laboratoire de Météorologie Physique
2012
Finnish Meteorological Institute
2007
Cloud drop condensation nuclei (CCN) and ice (IN) particles determine to a large extent cloud microstructure and, consequently, albedo the dynamic response of clouds aerosol-induced changes precipitation. This can modify reflected solar radiation thermal emitted space. Measurements tropospheric CCN IN over areas have not been possible be only roughly approximated from satellite-sensor-based estimates optical properties aerosols. Our lack ability measure both updrafts precludes disentangling...
Abstract. In this paper we describe and summarize the main achievements of European Aerosol Cloud Climate Air Quality Interactions project (EUCAARI). EUCAARI started on 1 January 2007 ended 31 December 2010 leaving a rich legacy including: (a) comprehensive database with year observations physical, chemical optical properties aerosol particles over Europe, (b) measurements in four developing countries, (c) airborne aerosols clouds Europe during May 2008, (d) modeling tools to study processes...
Abstract. This paper synthesizes the available scientific information connecting atmospheric nucleation with subsequent cloud condensation nuclei (CCN) formation. We review both observations and model studies related to this topic, discuss potential climatic implications. conclude that CCN production associated is frequent widespread phenomenon in many types of continental boundary layers, probably also over a large fraction free troposphere. The contribution global budget spans relatively...
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. 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...
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. The European Aerosol Cloud Climate and Air Quality Interactions project EUCAARI is an EU Research Framework 6 integrated focusing on understanding the interactions of climate air pollution. works in integrative multidisciplinary way from nano- to global scale. brings together several leading research groups, state-of-the-art infrastructure some key scientists third countries investigate role aerosol quality. Altogether 48 partners 25 are participating EUCAARI. During first 16...
Abstract. The number concentration of cloud droplets determines several climatically relevant properties. A major cause for the high uncertainty in indirect aerosol forcing is availability condensation nuclei (CCN), which turn highly sensitive to atmospheric new particle formation. Here we present effect formation on anthropogenic present-day (year 2000) and future 2100) conditions. total increased from −1.0 W m−2 −1.6 when nucleation introduced into model. Nucleation doubles change between...
Abstract. The global aerosol-climate model ECHAM5-HAM was modified to improve the representation of new particle formation in boundary layer. Activation-type nucleation mechanism introduced produce observed rates lower troposphere. A simple and computationally efficient for biogenic secondary organic aerosol (BSOA) implemented. Here we study sensitivity cloud droplet number concentrations (CDNC) these additions. significantly increases Increased have a significant effect also on therefore...
Abstract. The sectional aerosol module SALSA is introduced. model has been designed to be implemented in large scale climate models, which require both accuracy and computational efficiency. We have used multiple methods reduce the burden of different processes optimize performance without losing physical features relevant problematics importance. optimizations include limiting chemical compounds available size sections particles; division distribution into using variable width depending on...
Abstract. Currently many ground-based atmospheric stations include in-situ measurements of aerosol physical and optical properties, resulting in more than 20 long-term (> 10 yr) measurement sites the Northern Hemisphere Antarctica. Most these are located at remote locations monitor particle number concentration, wavelength-dependent light scattering, backscattering, absorption coefficients. The existence multi-year datasets enables analysis trends parameters, derived scattering Ångström...
Abstract. We have analysed the trends of total aerosol particle number concentrations (N) measured at long-term measurement stations involved either in Global Atmosphere Watch (GAW) and/or EU infrastructure project ACTRIS. The sites are located Europe, North America, Antarctica, and on Pacific Ocean islands. majority showed clear decreasing both full-length time series, intra-site comparison period 2001–2010, especially during winter months. Several potential driving processes for observed...
Abstract. The online-coupled, regional chemistry transport model COSMO-ART is evaluated for periods in all seasons against several measurement datasets to assess its ability represent gaseous pollutants and ambient aerosol characteristics over the European domain. Measurements used comparison include long-term station observations, satellite ground-based remote sensing products, complex of chemical composition number size distribution from recent field campaigns. This first time these...
Abstract. The biosphere emits volatile organic compounds (BVOCs) which, after oxidation in the atmosphere, can partition on existing aerosol population or even form new particles. large quantities emitted provide means for a potential impact both direct and indirect effects. Biogenic responses to atmospheric temperature change establish feedbacks rather short timescales. However, due complexity of partitioning, sign these is uncertainty. We use global aerosol-climate model ECHAM5.5-HAM2...
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. The smelter industry in Kola Peninsula is the largest source of anthropogenic SO2 Arctic part Europe and one within domain. Due to socio-economic changes Russia, emissions have been decreasing especially since late 1990s resulting decreased concentrations close eastern Lapland, Finland. At same time, frequency new particle formation days has distinctively at SMEAR I station during spring autumn. We show that sulfur species, namely dioxide sulfuric acid, an important role both...
The formation of new atmospheric particles involves an initial step forming stable clusters less than a nanometre in size (<~1 nm), followed by growth into quasi-stable aerosol few nanometres (~1-10 nm) and larger (>~10 nm). Although at times, the same species can be responsible for both processes, it is thought that more generally each comprises differing chemical contributors. Here, we present novel analysis measurements from unique multi-station ground-based observing system which reveals...
Abstract. Ambient aerosol, CCN (cloud condensation nuclei) and hygroscopic properties were measured with a size-segregated CCNC nuclei counter) in boreal environment of southern Finland at the SMEAR (Station for Measuring Ecosystem-Atmosphere Relations) II station. The instrumental setup operated five levels supersaturation S covering range from 0.1–1% particles size 20–300 nm; total 29 non-consecutive months data are presented. median critical diameter Dc ranged 150 nm 0.1% to 46 1.0%....
Atmospheric aerosols often contain surface active organics. We study the influence of these surfactants on predictions particle cloud activation potential and aerosol indirect climate effects, by implementing different parametrizations surfactant effects in global circulation model ECHAM5.5–HAM2. A parametrization based only droplet tension reduction produces significantly larger predicted numbers than novel detailed considerations organic activity. It seems better to disregard altogether...
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...