Publications

Atmospheric pressure thermal desorption chemical ionization mass spectrometry for ultra-sensitive explosive detection

Illegal explosives are a threat to aviation, transport sector, critical infrastructure and generally to public safety. Their detection …
DOI

A Comparison of Neural Networks and Center of Gravity in Muon Hit Position Estimation

The performance of cosmic-ray tomography systems is largely determined by their tracking accuracy. With conventional scintillation …
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Polluted skies are cloudier

Analyses of the 2014 Iceland-Holuhraun volcanic eruption revealed the emitted aerosols induced a 10% increase in cloud coverage above …
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Optimization of La0.2Sr0.7-xCaxTi0.95Fe0.05O3-delta Fuel Electrode Stoichiometry for Solid Oxide Fuel-Cell Application

Development of active ceramic hydrogen electrodes with high stability is an important challenge for developing solid oxide fuel cells …
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Diurnal evolution of negative atmospheric ions above the boreal forest: from ground level to the free troposphere

At SMEAR II research station in Hyytiala, located in the Finnish boreal forest, the process of new particle formation and the role of …
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Sub-daily rainfall extremes in the Nordic-Baltic region

Short-duration rainfall extremes are associated with a range of societal hazards, notably pluvial flooding but in addition, e.g., …
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Quiet New Particle Formation in the Atmosphere

Atmospheric new particle formation (NPF) has been observed to take place in practice all around the world. In continental locations, …
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Terpene emissions from boreal wetlands can initiate stronger atmospheric new particle formation than boreal forests

Aerosols and their interaction with clouds constitute the largest uncertainty in estimating the radiative forcing affecting the climate …
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The SALTENA Experiment Comprehensive Observations of Aerosol Sources, Formation, and Processes in the South American Andes

This paper presents an introduction to the Southern Hemisphere High Altitude Experiment on Particle Nucleation and Growth (SALTENA). …
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Salinity dynamics of the Baltic Sea

In the Baltic Sea, salinity and its large variability, both horizontal and vertical, are key physical factors in determining the …
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Meteorological Conditions Favorable for Strong Anthropogenic Aerosol Impacts on Clouds

Ship-track-like polluted cloud tracks provide a direct way to study aerosol-cloud interactions. Here, we study environmental conditions …
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Opportunistic experiments to constrain aerosol effective radiative forcing

Aerosol-cloud interactions (ACIs) are considered to be the most uncertain driver of present-day radiative forcing due to human …
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Molecular Composition of Oxygenated Organic Molecules and Their Contributions to Organic Aerosol in Beijing

The understanding at a molecular level of ambient secondary organic aerosol (SOA) formation is hampered by poorly constrained formation …
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Links between the concentrations of gaseous pollutants measured in different regions of Estonia

The factors that determine the concentrations of air pollutants (NO, NO2, SO2, O-3), measured in 8 monitoring stations (4 rural …
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Influence of Carbon Dioxide and Humidity on the Stability of (La0.6Sr0.4)(0.99)Co1-xTixO3-delta Cathode

(La0.6Sr0.4)(0.99)CoO3-delta is a very promising cathode material due to its excellent electronic and ionic conductivity. However, …
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Observed changes in heavy daily precipitation over the Nordic-Baltic region

Study region: The Nordic-Baltic region has experienced numerous flooding episodes resulting from heavy rainfall. Such events are costly …
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A global observational analysis to understand changes in air quality during exceptionally low anthropogenic emission conditions

This global study, which has been coordinated by the World Meteorological Organization Global Atmospheric Watch (WMO/GAW) programme, …
Ranjeet S. Sokhi, Vikas Singh, Xavier Querol, Sandro Finardi, Admir Creso Targino, Maria de Fatima Andrade, Radenko Pavlovic, Rebecca M. Garland, Jordi Massague, Shaofei Kong, Alexander Baklanov, Lu Ren, Oksana Tarasova, Greg Carmichael, Vincent-Henri Peuch, Vrinda Anand, Graciela Arbilla, Kaitlin Badali, Gufran Beig, Luis Carlos Belalcazar, Andrea Bolignano, Peter Brimblecombe, Patricia Camacho, Alejandro Casallas, Jean-Pierre Charland, Jason Choi, Eleftherios Chourdakis, Isabelle Coll, Marty Collins, Josef Cyrys, Cleyton Martins da Silva, Alessandro Domenico Di Giosa, Anna Di Leo, Camilo Ferro, Mario Gavidia-Calderon, Amiya Gayen, Alexander Ginzburg, Fabrice Godefroy, Yuri Alexandra Gonzalez, Marco Guevara-Luna, Sk Mafizul Haque, Henno Havenga, Dennis Herod, Urmas Horrak, Tareq Hussein, Sergio Ibarra, Monica Jaimes, Marko Kaasik, Ravindra Khaiwal, Jhoon Kim, Anu Kousa, Jaakko Kukkonen, Markku Kulmala, Joel Kuula, Nathalie La Violette, Guido Lanzani, Xi Liu, Stephanie MacDougall, Patrick M. Manseau, Giada Marchegiani, Brian McDonald, Swasti Vardhan Mishra, Luisa T. Molina, Dennis Mooibroek, Suman Mor, Nicolas Moussiopoulos, Fabio Murena, V, Jarkko Niemi, Steffen Noe, Thiago Nogueira, Michael Norman, Juan Luis Perez-Camano, Tuukka Petaja, Stuart Piketh, Aditi Rathod, Ken Reid, Armando Retama, Olivia Rivera, Nestor Y. Rojas, Jhojan P. Rojas-Quincho, Roberto San Jose, Odon Sanchez, Rodrigo J. Seguel, Salla Sillanpaa, Yushan Su, Nigel Tapper, Antonio Terrazas, Hilkka Timonen, Domenico Toscano, George Tsegas, Guus J. M. Velders, Christos Vlachokostas, Erika von Schneidemesser, V. P. M. Rajasree, Ravi Yadav, Rasa Zalakeviciute, Miguel Zavala
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Photodissociation dynamics of halogenated aromatic molecules: the case of core-ionized tetrabromothiophene

We studied the gas-phase photodissociation of a fully halogenated aromatic molecule, tetrabromothiophene, upon core-shell ionization by …
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Zeppelin-led study on the onset of new particle formation in the planetary boundary layer

We compared observations of aerosol particle formation and growth in different parts of the planetary boundary layer at two different …
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The importance of sesquiterpene oxidation products for secondary organic aerosol formation in a springtime hemiboreal forest

Secondary organic aerosols (SOAs) formed from biogenic volatile organic compounds (BVOCs) constitute a significant fraction of …
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The Effect of Prestressing and Temperature on Tensile Strength of Basalt Fiber-Reinforced Plywood

The reinforcement of plywood is demonstrated by laminating pretensioned basalt fibers between veneer sheets, to fabricate so-called …
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Forest canopy mitigates soil N2O emission during hot moments

Riparian forests are known as hot spots of nitrogen cycling in landscapes. Climate warming speeds up the cycle. Here we present results …
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Climatology of Convective Storms in Estonia from Radar Data and Severe Convective Environments

Data from the C-band weather radar located in central Estonia in conjunction with the latest reanalysis of the European Centre for …
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Cost-benefit analysis of health risks caused by indicative dose from drinking water consumption

The effective dose annual limit in European Union member states for doses above natural background is 1 mSv. This includes ingestion, …
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The Synergistic Role of Sulfuric Acid, Bases, and Oxidized Organics Governing New-Particle Formation in Beijing

Intense and frequent new particle formation (NPF) events have been observed in polluted urban environments, yet the dominant mechanisms …
Chao Yan, Rujing Yin, Yiqun Lu, Lubna Dada, Dongsen Yang, Yueyun Fu, Jenni Kontkanen, Chenjuan Deng, Olga Garmash, Jiaxin Ruan, Rima Baalbaki, Meredith Schervish, Runlong Cai, Matthew Bloss, Tommy Chan, Tianzeng Chen, Qi Chen, Xuemeng Chen, Yan Chen, Biwu Chu, Kaspar Dallenbach, Benjamin Foreback, Xucheng He, Liine Heikkinen, Tuija Jokinen, Heikki Junninen, Juha Kangasluoma, Tom Kokkonen, Mona Kurppa, Katrianne Lehtipalo, Haiyan Li, Hui Li, Xiaoxiao Li, Yiliang Liu, Qingxin Ma, Pauli Paasonen, Pekka Rantala, Rosaria E. Pileci, Anton Rusanen, Nina Sarnela, Pauli Simonen, Shixian Wang, Weigang Wang, Yonghong Wang, Mo Xue, Gan Yang, Lei Yao, Ying Zhou, Joni Kujansuu, Tuukka Petaja, Wei Nie, Yan Ma, Maofa Ge, Hong He, Neil M. Donahue, Douglas R. Worsnop, Veli-Matti Kerminen, Lin Wang, Yongchun Liu, Jun Zheng, Markku Kulma, Jingkun Jiang, Federico Bianchi
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Is reducing new particle formation a plausible solution to mitigate particulate air pollution in Beijing and other Chinese megacities?

Atmospheric gas-to-particle conversion is a crucial or even dominant contributor to haze formation in Chinese megacities in terms of …
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Indoor Model Simulation for COVID-19 Transport and Exposure

Transmission of respiratory viruses is a complex process involving emission, deposition in the airways, and infection. Inhalation is …
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Evaluation of the dual-polarization weather radar quantitative precipitation estimation using long-term datasets

Accurate, timely, and reliable precipitation observations are mandatory for hydrological forecast and early warning systems. In the …
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Role of iodine oxoacids in atmospheric aerosol nucleation

Iodic acid (HIO3) is known to form aerosol particles in coastal marine regions, but predicted nucleation and growth rates are lacking. …
Xu-Cheng He, Yee Jun Tham, Lubna Dada, Mingyi Wang, Henning Finkenzeller, Dominik Stolzenburg, Siddharth Iyer, Mario Simon, Andreas Kuerten, Jiali Shen, Birte Roerup, Matti Rissanen, Siegfried Schobesberger, Rima Baalbaki, Dongyu S. Wang, Theodore K. Koenig, Tuija Jokinen, Nina Sarnela, Lisa J. Beck, Joao Almeida, Stavros Amanatidis, Antonio Amorim, Farnoush Ataei, Andrea Baccarini, Barbara Bertozzi, Federico Bianchi, Sophia Brilke, Lucia Caudillo, Dexian Chen, Randall Chiu, Biwu Chu, Antonio Dias, Aijun Ding, Josef Dommen, Jonathan Duplissy, Imad El-Haddad, Loic Gonzalez Carracedo, Manuel Granzin, Armin Hansel, Martin Heinritzi, Victoria Hofbauer, Heikki Junninen, Juha Kangasluoma, Deniz Kemppainen, Changhyuk Kim, Weimeng Kong, Jordan E. Krechmer, Aleksander Kvashin, Totti Laitinen, Houssni Lamkaddam, Chuan Ping Lee, Katrianne Lehtipalo, Markus Leiminger, Zijun Li, Vladimir Makhmutov, Hanna E. Manninen, Guillaume Marie, Ruby Marten, Serge Mathot, Roy L. Mauldin, Bernhard Mentler, Ottmar Moehler, Tatjana Mueller, Wei Nie, Antti Onnela, Tuukka Petaja, Joschka Pfeifer, Maxim Philippov, Ananth Ranjithkumar, Alfonso Saiz-Lopez, Imre Salma, Wiebke Scholz, Simone Schuchmann, Benjamin Schulze, Gerhard Steiner, Yuri Stozhkov, Christian Tauber, Antonio Tome, Roseline C. Thakur, Olli Vaisanen, Miguel Vazquez-Pufleau, Andrea C. Wagner, Yonghong Wang, Stefan K. Weber, Paul M. Winkler, Yusheng Wu, Mao Xiao, Chao Yan, Qing Ye, Arttu Ylisirnio, Marcel Zauner-Wieczorek, Qiaozhi Zha, Putian Zhou, Richard C. Flagan, Joachim Curtius, Urs Baltensperger, Markku Kulmala, Veli-Matti Kerminen, Theo Kurten, Neil M. Donahue, Rainer Volkamer, Jasper Kirkby, Douglas R. Worsnop, Mikko Sipila
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Differing Mechanisms of New Particle Formation at Two Arctic Sites

New particle formation in the Arctic atmosphere is an important source of aerosol particles. Understanding the processes of Arctic …
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Particle growth with photochemical age from new particle formation to haze in the winter of Beijing, China

Secondary aerosol formation in the aging process of primary emission is the main reason for haze pollution in eastern China. Pollution …
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Long-term measurement of sub-3 nm particles and their precursor gases in the boreal forest

The knowledge of the dynamics of sub-3 nm particles in the atmosphere is crucial for our understanding of the first steps of …
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Insights into atmospheric oxidation processes by performing factor analyses on subranges of mass spectra

Our understanding of atmospheric oxidation chemistry has improved significantly in recent years, greatly facilitated by developments in …
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Biogenic and anthropogenic sources of aerosols at the High Arctic site Villum Research Station

There are limited measurements of the chemical composition, abundance and sources of atmospheric particles in the High Arctic To …
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A novel approach for simple statistical analysis of high-resolution mass spectra

Recent advancements in atmospheric mass spectrometry provide huge amounts of new information but at the same time present considerable …
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Highly Oxygenated Organic Molecules (HOM) from Gas-Phase Autoxidation Involving Peroxy Radicals: A Key Contributor to Atmospheric Aerosol

Highly oxygenated organic molecules (HOM) are formed in the atmosphere via autoxidation involving peroxy radicals arising from volatile …
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Constructing a data-driven receptor model for organic and inorganic aerosol - a synthesis analysis of eight mass spectrometric data sets from a boreal forest site

The interactions between organic and inorganic aerosol chemical components are integral to understanding and modelling climate and …
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Parameters governing the performance of electrical mobility spectrometers for measuring sub-3 nm particles

Measuring aerosol size distributions accurately down to similar to 1 nm is a key to nucleation studies, and it requires developments …
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Refined classification and characterization of atmospheric new-particle formation events using air ions

Atmospheric new-particle formation (NPF) is a worldwide-observed phenomenon that affects the human health and the global climate. With …
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Ion-induced sulfuric acid-ammonia nucleation drives particle formation in coastal Antarctica

Formation of new aerosol particles from trace gases is a major source of cloud condensation nuclei (CCN) in the global atmosphere, with …
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Predicting atmospheric particle formation days by Bayesian classification of the time series features

Atmospheric new-particle formation (NPF) is an important source of climatically relevant atmospheric aerosol particles. NPF can be …
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Global analysis of continental boundary layer new particle formation based on long-term measurements

Atmospheric new particle formation (NPF) is an important phenomenon in terms of global particle number concentrations. Here we …
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The role of H2SO4-NH3 anion clusters in ion-induced aerosol nucleation mechanisms in the boreal forest

New particle formation (NPF) provides a large source of atmospheric aerosols, which affect the climate and human health. In recent …
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Exploring non-linear associations between atmospheric new-particle formation and ambient variables: a mutual information approach

Atmospheric new-particle formation (NPF) is a very non-linear process that includes atmospheric chemistry of precursors and clustering …
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Comprehensive analysis of particle growth rates from nucleation mode to cloud condensation nuclei in boreal forest

Growth of aerosol particles to sizes at which they can act as cloud condensation nuclei (CCN) is a crucial factor in estimating the …
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Atmospheric new particle formation from sulfuric acid and amines in a Chinese megacity

Atmospheric new particle formation (NPF) is an important global phenomenon that is nevertheless sensitive to ambient conditions. …
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Observations of biogenic ion-induced cluster formation in the atmosphere

A substantial fraction of aerosols, which affect air quality and climate, is formed from gaseous precursors. Highly oxygenated organic …
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Atmospheric new particle formation at the research station Melpitz, Germany: connection with gaseous precursors and meteorological parameters

This paper revisits the atmospheric new particle formation (NPF) process in the polluted Central European troposphere, focusing on the …
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Observations of ozone depletion events in a Finnish boreal forest

We investigated the concentrations and vertical profiles of ozone over a 20-year period (1996-2016) at the SMEAR II station in southern …
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Influence of temperature on the molecular composition of ions and charged clusters during pure biogenic nucleation

It was recently shown by the CERN CLOUD experiment that biogenic highly oxygenated molecules (HOMs) form particles under atmospheric …
Carla Frege, Ismael K. Ortega, Matti P. Rissanen, Arnaud P. Praplan, Gerhard Steiner, Martin Heinritzi, Lauri Ahonen, Antonio Amorim, Anne-Kathrin Bernhammer, Federico Bianchi, Sophia Brilke, Martin Breitenlechner, Lubna Dada, Antonio Dias, Jonathan Duplissy, Sebastian Ehrhart, Imad El-Haddad, Lukas Fischer, Claudia Fuchs, Olga Garmash, Marc Gonin, Armin Hansel, Christopher R. Hoyle, Tuija Jokinen, Heikki Junninen, Jasper Kirkby, Andreas Kuerten, Katrianne Lehtipalo, Markus Leiminger, Roy Lee Mauldin, Ugo Molteni, Leonid Nichman, Tuukka Petaja, Nina Sarnela, Siegfried Schobesberger, Mario Simon, Mikko Sipila, Dominik Stolzenburg, Antonio Tome, Alexander L. Vogel, Andrea C. Wagner, Robert Wagner, Mao Xiao, Chao Yan, Penglin Ye, Joachim Curtius, Neil M. Donahue, Richard C. Flagan, Markku Kulmala, Douglas R. Worsnop, Paul M. Winkler, Josef Dommen, Urs Baltensperger
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The role of highly oxygenated molecules (HOMs) in determining the composition of ambient ions in the boreal forest

In order to investigate the negative ions in the boreal forest we have performed measurements to chemically characterise the …
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Pan-Eurasian Experiment (PEEX): towards a holistic understanding of the feedbacks and interactions in the land-atmosphere-ocean-society continuum in the northern Eurasian region

The northern Eurasian regions and Arctic Ocean will very likely undergo substantial changes during the next decades. The Arctic-boreal …
Hanna K. Lappalainen, Veli-Matti Kerminen, Tuukka Petaja, Theo Kurten, Aleksander Baklanov, Anatoly Shvidenko, Jaana Back, Timo Vihma, Pavel Alekseychik, Meinrat O. Andreae, Stephen R. Arnold, Mikhail Arshinov, Eija Asmi, Boris Belan, Leonid Bobylev, Sergey Chalov, Yafang Cheng, Natalia Chubarova, Gerrit de Leeuw, Aijun Ding, Sergey Dobrolyubov, Sergei Dubtsov, Egor Dyukarev, Nikolai Elansky, Kostas Eleftheriadis, Igor Esau, Nikolay Filatov, Mikhail Flint, Congbin Fu, Olga Glezer, Aleksander Gliko, Martin Heimann, Albert A. M. Holtslag, Urmas Horrak, Juha Janhunen, Sirkku Juhola, Leena Jarvi, Heikki Jarvinen, Anna Kanukhina, Pavel Konstantinov, Vladimir Kotlyakov, Antti-Jussi Kieloaho, Alexander S. Komarov, Joni Kujansuu, Ilmo Kukkonen, Ella-Maria Duplissy, Ari Laaksonen, Tuomas Laurila, Heikki Lihavainen, Alexander Lisitzin, Alexsander Mahura, Alexander Makshtas, Evgeny Mareev, Stephany Mazon, Dmitry Matishov, Vladimir Melnikov, Eugene Mikhailov, Dmitri Moisseev, Robert Nigmatulin, Steffen M. Noe, Anne Ojala, Mari Pihlatie, Olga Popovicheva, Jukka Pumpanen, Tatjana Regerand, Irina Repina, Aleksei Shcherbinin, Vladimir Shevchenko, Mikko Sipila, Andrey Skorokhod, Dominick V. Spracklen, Hang Su, Dmitry A. Subetto, Junying Sun, Arkady Y. Terzhevik, Yuri Timofeyev, Yuliya Troitskaya, Veli-Pekka Tynkkynen, Viacheslav I. Kharuk, Nina Zaytseva, Jiahua Zhang, Yrjo Viisanen, Timo Vesala, Pertti Hari, Hans-Christen Hansson, Gennady G. Matvienko, Nikolai S. Kasimov, Huadong Guo, Valery Bondur, Sergej Zilitinkevich, Markku Kulmala
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How to reliably detect molecular clusters and nucleation mode particles with Neutral cluster and Air Ion Spectrometer (NAIS)

To understand the very first steps of atmospheric particle formation and growth processes, information on the size where the …
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The legacy of Finnish-Estonian air ion and aerosol workshops

Atmospheric air ions, clusters and aerosol particles participate in a variety of atmospheric processes and considerably affect e.g. …

On the accuracy of ion measurements using a Neutral cluster and Air Ion Spectrometer

Here, we present a calibration of the Neutral cluster and Air Ion Spectrometer (NAIS, Airel Ltd.) for the size and concentration of …

Characteristics of new-particle formation at three SMEAR stations

We analyzed the size distributions of atmospheric aerosol particles measured during 2013-2014 at Varrio (SMEAR I) in northern Finland, …

Interpretation of Atmospheric Aerosol Measurements by Means of a Numerical Simulator of New Particle Formation Events

We performed a more comprehensive test of a new NPF parameter estimator published recently. The estimator considers measurements as …
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Measuring atmospheric ion bursts and their dynamics using mass spectrometry

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A Method for Automated Estimation of Parameters Controlling Aerosol New Particle Formation

We use a previously published simulator of aerosol new particle formation (NPF) events as the core component of the new method for …
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Intermediate ions in the atmosphere

Intermediate air ions are charged nanometer-sized aerosol particles with an electric mobility of about 0.03-0.5 cm(2) V-1 s(-1) and a …
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Data cycle in atmospheric physics : From detected millivolts to understanding the atmosphere

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Heterogeneous nucleation in multi-component vapor on a partially wettable charged conducting particle. II. The generalized Laplace, Gibbs-Kelvin, and Young equations and application to nucleation

Based on the results of a previous paper [M. Noppel, H. Vehkamaki, P. M. Winkler, M. Kulmala, and P. E. Wagner, J. Chem. Phys. 139, …
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Heterogeneous nucleation in multi-component vapor on a partially wettable charged conducting particle. I. Formulation of general equations: Electrical surface and line excess quantities

Thermodynamics is applied to formulate general equations for internal energies and grand potential for a system consisting of a …
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The mathematical principles and design of the NAIS - a spectrometer for the measurement of cluster ion and nanometer aerosol size distributions

The paper describes the Neutral cluster and Air Ion Spectrometer (NAIS) - a multichannel aerosol instrument capable of measuring the …
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Estimating neutral nanoparticle steady-state size distribution and growth according to measurements of intermediate air ions

Continuous measurements of intermediate air ion size distributions were carried out in the small town Tartu, Estonia, from 1 April 2010 …
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Does the Onset of New Particle Formation Occur in the Planetary Boundary Layer?

The planetary boundary layer (PBL) is chemically and physically the most active and complex part of the atmosphere as it has high …
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Atmospheric Electricity and Aerosol-Cloud Interactions in Earth's Atmosphere

Firstly, atmospheric ions play an important role in the fair weather electricity in Earth's atmosphere. Small ions, or charged …
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Characterisation of sub-micron particle number concentrations and formation events in the western Bushveld Igneous Complex, South Africa

South Africa holds significant mineral resources, with a substantial fraction of these reserves occurring and being processed in a …
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Composition of negative air ions as a function of ion age and selected trace gases: Mass- and mobility distribution

In order to explore an additional window to look into the mechanisms behind atmospheric ion and particle formation, an advanced method, …
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Links between two different types of spectra of charged nanometer aerosol particles

We have, since 2007, continuously measured the electrical mobility distribution of small (<1.5 nm in diameter) corona-generated …
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Geographical origin of aerosol particles observed during the LAPBIAT measurement campaign in spring 2003 in Finnish Lapland

A modelling analysis of observations of aerosol concentrations during the LAPBIAT measurement campaign is presented and possible …

The mathematical principles and design of the NAIS - a spectrometer for the measurement of cluster ion and nanometer aerosol size distributions

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Intercomparison of air ion spectrometers: an evaluation of results in varying conditions

We evaluated 11 air ion spectrometers from Airel Ltd. after they had spent one year in field measurements as a part of the EUCAARI …
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Growth rates of nucleation mode particles in Hyytiala during 2003-2009: variation with particle size, season, data analysis method and ambient conditions

The condensational growth rate of aerosol particles formed in atmospheric new particle formation events is one of the most important …
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General overview: European Integrated project on Aerosol Cloud Climate and Air Quality interactions (EUCAARI) - integrating aerosol research from nano to global scales

In this paper we describe and summarize the main achievements of the European Aerosol Cloud Climate and Air Quality Interactions …
M. Kulmala, A. Asmi, H. K. Lappalainen, U. Baltensperger, J. -L. Brenguier, M. C. Facchini, H. -C. Hansson, O. Hov, C. D. O'Dowd, U. Poeschl, A. Wiedensohler, R. Boers, O. Boucher, G. de Leeuw, H. A. C. Denier van der Gon, J. Feichter, R. Krejci, P. Laj, H. Lihavainen, U. Lohmann, G. McFiggans, T. Mentel, C. Pilinis, I. Riipinen, M. Schulz, A. Stohl, E. Swietlicki, E. Vignati, C. Alves, M. Amann, M. Ammann, S. Arabas, P. Artaxo, H. Baars, D. C. S. Beddows, R. Bergstrom, J. P. Beukes, M. Bilde, J. F. Burkhart, F. Canonaco, S. L. Clegg, H. Coe, S. Crumeyrolle, B. D'Anna, S. Decesari, S. Gilardoni, M. Fischer, A. M. Fjaeraa, C. Fountoukis, C. George, L. Gomes, P. Halloran, T. Hamburger, R. M. Harrison, H. Herrmann, T. Hoffmann, C. Hoose, M. Hu, A. Hyvarinen, U. Horrak, Y. Iinuma, T. Iversen, M. Josipovic, M. Kanakidou, A. Kiendler-Scharr, A. Kirkevag, G. Kiss, Z. Klimont, P. Kolmonen, M. Komppula, J. -E. Kristjansson, L. Laakso, A. Laaksonen, L. Labonnote, V. A. Lanz, K. E. J. Lehtinen, L. V. Rizzo, R. Makkonen, H. E. Manninen, G. McMeeking, J. Merikanto, A. Minikin, S. Mirme, W. T. Morgan, E. Nemitz, D. O'Donnell, T. S. Panwar, H. Pawlowska, A. Petzold, J. J. Pienaar, C. Pio, C. Plass-Duelmer, A. S. H. Prevot, S. Pryor, C. L. Reddington, G. Roberts, D. Rosenfeld, J. Schwarz, O. Seland, K. Sellegri, X. J. Shen, M. Shiraiwa, H. Siebert, B. Sierau, D. Simpson, J. Y. Sun, D. Topping, P. Tunved, P. Vaattovaara, V. Vakkari, J. P. Veefkind, A. Visschedijk, H. Vuollekoski, R. Vuolo, B. Wehner, J. Wildt, S. Woodward, D. R. Worsnop, G. -J. van Zadelhoff, A. A. Zardini, K. Zhang, P. G. van Zyl, V. -M. Kerminen, K. S. Carslaw, S. N. Pandis
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Development of nanometer aerosol measurement technology

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Characterisation of corona-generated ions used in a Neutral cluster and Air Ion Spectrometer (NAIS)

We characterized size and chemical composition of ions generated by a corona-needle charger of a Neutral cluster and Air Ion …
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Atmospheric ions and nucleation: a review of observations

This review is based on ca. 260 publications, 93 of which included data on the temporal and spatial variation of the concentration of …
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An Instrumental Comparison of Mobility and Mass Measurements of Atmospheric Small Ions

Ambient, naturally charged small ions (<2000 Da) were measured in Hyytiala, Finland, with amass spectrometer (atmospheric pressure …
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The role of cluster energy nonaccommodation in atmospheric sulfuric acid nucleation

We discuss the possible role of energy nonaccommodation (monomer-cluster collisions that do not result in stable product formation due …
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On the roles of sulphuric acid and low-volatility organic vapours in the initial steps of atmospheric new particle formation

Sulphuric acid and organic vapours have been identified as the key components in the ubiquitous secondary new particle formation in the …
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EUCAARI ion spectrometer measurements at 12 European sites - analysis of new particle formation events

We present comprehensive results on continuous atmospheric cluster and particle measurements in the size range similar to 1-42 nm …
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Development of electrical air-ion spectrometers

Atmospheric sub-3 nm particles at high altitudes

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Atmospheric sub-3 nm particles at high altitudes

Formation of new atmospheric aerosol particles is known to occur almost all over the world and the importance of these particles to …
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Atmospheric nucleation: highlights of the EUCAARI project and future directions

Within the project EUCAARI (European Integrated project on Aerosol Cloud Climate and Air Quality interactions), atmospheric nucleation …
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Atmospheric data over a solar cycle: no connection between galactic cosmic rays and new particle formation

Aerosol particles affect the Earth's radiative balance by directly scattering and absorbing solar radiation and, indirectly, through …
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A high-resolution mass spectrometer to measure atmospheric ion composition

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Long-term field measurements of charged and neutral clusters using Neutral cluster and Air Ion Spectrometer (NAIS)

To understand the very first steps of atmospheric particle formation and growth, measurements at the size where atmospheric nucleation …

Some air electricity phenomena caused by waterfalls: Correlative study of the spectra

According to Our previous measurements, waterfalls permanently modify air ion spectra. In this paper we performed a correlative study …
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Smart-SMEAR: on-line data exploration and visualization tool for SMEAR stations

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Results of the first air ion spectrometer calibration and intercomparison workshop

The Air Ion Spectrometer (AIS) measures mobility and size distributions of atmospheric ions. The Neutral cluster and Air Ion …
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Quantifying the Impact of Residential Heating on the Urban Air Quality in a Typical European Coal Combustion Region

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Negatively charged nanoparticles produced by splashing of water

The production of splashing-generated balloelectric intermediate ions was studied by means of mobility spectrometry in the atmosphere …
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Diffusion Distortions in a Differential Mobility Analyzer with Inclined Electric Field

An approach based on the calculation of the probabilities of the random displacements of particles around their regular trajectories …
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Overview of the biosphere-aerosol-cloud-climate interactions (BACCI) studies

Here we present research methods and results obtained by the Nordic Centre of Excellence Biosphere-Aerosol-Cloud-Climate Interactions …
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Observations on nocturnal growth of atmospheric clusters

In this paper, we summarize recent observations of nighttime nucleation events observed during 4 yr, from 2003 to 2006, at the SMEAR II …
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Aerosol particle formation events and analysis of high growth rates observed above a subarctic wetland-forest mosaic

An analysis of particle formation (PF) events over a subarctic mire in northern Sweden was performed, based on number-size …
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Heterogeneous nucleation experiments bridging the scale from molecular ion clusters to nanoparticles

Generation, investigation, and manipulation of nanostructured materials are of fundamental and practical importance for several …
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Variation and balance of positive air ion concentrations in a boreal forest

Air ions are characterized on the basis of measurements carried out in a boreal forest at the Hyytiala SMEAR station, Finland, during …
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Observations on nocturnal growth of atmospheric clusters

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Formation and characteristics of ions and charged aerosol particles in a native Australian Eucalypt forest

Biogenic aerosol formation is likely to contribute significantly to the global aerosol load. In recent years, new-particle formation …
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Toward direct measurement of atmospheric nucleation

Atmospheric aerosol formation is known to occur almost all over the world, and the importance of these particles to climate and air …
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Size distributions of atmospheric ions in the Baltic Sea region

Number size distributions of air ions and aerosol particles were measured at three sites in the Baltic Sea region in spring 2004. One …

Quantum chemical studies of hydrate formation of H2SO4 and HSO4-

We calculate structures and thermochernical parameters for H (2)so(4)center dot(H O-2)(n), HSO4 center dot H O-2),' H2SO (4)center dot …

Chemical composition of waterfall-induced air ions: spectrometry vs. simulations

Our measurements of ion size distributions near a waterfall provided new evidence for a waterfal I- induced modification of air ion …

A wide-range multi-channel air ion spectrometer

A new multi-channel air ion spectrometer (AIS) is presented. The instrument allows simultaneous measurements of positive and negative …

Waterfalls as sources of small charged aerosol particles

In this study, we measured the mobility distributions of cluster and intermediate ions with an ion spectrometer near a waterfall. We …
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Identification and classification of the formation of intermediate ions measured in boreal forest

We have measured the size distributions of air ions (0.42 - 7.5 nm in diameter) with the Balanced Scanning Mobility Analyzer in boreal …
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Concentrations and fluxes of aerosol particles during the LAPBIAT measurement campaign at Varrio field station

The LAPBIAT measurement campaign took place in the Varrio SMEAR I measurement station located in Eastern Lapland in the spring of 2003 …
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A wide range multi-channel Air Ion Spectrometer

New aerosol particle formation via certain ion driven processes

Ions can speed up the formation of aerosol particles. The former studies have mainly concerned on the role of the ion charge itself. We …
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Charging state of atmospheric nanoparticles during the nucleation burst events

In this work, the charging state of atmospheric nanoparticles was estimated through simultaneous measurements of aerosol size …
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Factors of air ion balance in a coniferous forest according to measurements in Hyytiala, Finland

A new mathematical model describing air ion balance was developed and tested. It has improved approximations and includes dry …
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Ab initio and density functional theory reinvestigation of gas-phase sulfuric acid monohydrate and ammonium hydrogen sulfate

We have calculated the thermochemical parameters for the reactions H2SO4 + H2O <-> H2SO4 center dot H2O and H2SO4 + NH3 <-> …
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Annual and size dependent variation of growth rates and ion concentrations in boreal forest

Number size distributions of particles and ions were measured with a differential mobility particle sizer and two different ion …

Initial steps of aerosol growth

The formation and growth of atmospheric aerosols depend on several steps, namely nucleation, initial steps of growth and subsequent - …
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Kinetic nucleation and ions in boreal forest particle formation events

In order to gain a more comprehensive picture on different mechanisms behind atmospheric particle formation, measurement results from …
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Stable ammonium bisulfate clusters in the atmosphere

Liquid drop model based equilibrium thermodynamics predicts that in the presence of even small ammonia concentrations practically all …
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Ion production rate in a boreal forest based on ion, particle and radiation measurements

In this study the ion production rates in a boreal forest were studied based on two different methods: 1) cluster ion and particle …
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Comparative study of nucleation mode aerosol particles and intermediate air ions formation events at three sites

Quantitative characteristics of the formation and growth events of nucleation mode aerosol particles occurred at three stations …
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Observed and simulated effects of certain pollutants on small air ion spectra: I. Positive ions

The trends of the few-second-aged small positive air ion spectra caused by enhanced concentrations of certain trace gases (HCl, …
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Methods for imputation of missing values in air quality data sets

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Reversible work of the formation of a layer of a new phase on a spherical charged conductor within a uniform multicomponent macroscopic mother phase

A thermodynamically consistent formalism is applied to calculate the reversible work needed to form a small layer of a new phase …
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Diurnal variation in the concentration of air ions of different mobility classes in a rural area

Analyzed data consist of 8900 hourly average mobility distributions measured in the mobility range of 0.00041-3.2 cm(2) V(-)1 s(-1) ( …
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Simulation of atmospheric nucleation mode: A comparison of nucleation models and size distribution representations

Atmospheric particle formation and growth were investigated using different nucleation models and size distribution representations. …
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Modelling binary homogeneous nucleation of water-sulfuric acid vapours: Parameterisation for high temperature emissions

Particles formed in the automobile exhaust might form a significant fraction of fine particles in urban air. We have developed a model …
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Self-consistent binary cluster size distributions: nucleation of sulfuric acid-water vapors

vThe incorporation of additional information on free energies of small clusters in a cluster distribution based on the capillarity …
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An improved parameterization for sulfuric acid-water nucleation rates for tropospheric and stratospheric conditions

In this paper we present parameterized equations for calculation of sulfuric acid-water critical nucleus compositions, critical cluster …
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Parametrization of ternary nucleation rates for H(2)SO(4)-NH(3)-H(2)O vapors

[1] A parametrization of nucleation rates for H(2)O-H(2)SO(4)-NH(3) vapors in atmospheric conditions is developed. The parametrization …
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Evolution of negative small air ions at two different temperatures

In this paper, we simulate the negative ion evolution shape considering 151 different ions, 66 trace gases and 493 ion-molecule …
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An improved model for ternary nucleation of sulfuric acid-ammonia-water

A revised homogeneous ternary nucleation model in H2O-H2SO4-NH3 vapors is presented. The model is based on a self-consistent version of …
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An improved model for hydrate formation in sulfuric acid-water nucleation

The formation of sulfuric acid-water hydrates in the vapor phase and nucleation rates of sulfuric acid-water clusters are investigated. …
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Monitoring and Source Apportionment of Polycyclic Aromatic Hydrocarbons in Estonian Soil

Enthalpy and entropy changes in formation of gas phase sulfuric acid monohydrates and dihydrates as a result of fitting to experimental pressure data

The values of enthalpy change Delta H-1 = -44.3 kJ/mol and entropy change Delta S-1 = -94.6 J/mol in the gas phase addition of a water …
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Statistical characterization of air ion mobility spectra at Tahkuse Observatory: Classification of air ions

A database of 8615 hourly averaged air ion mobility spectra in the range of 0.00041-3.2 cm(2) V-1 s(-1) was measured at Tahkuse …
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Self-consistent binary cluster-size distributions of sulfuric acid-water system

The new self-consistent and partially self-consistent forms of binary distribution function are proposed. The activities (number …

Temperature variation of the evolution of positive small air ions at constant relative humidity

The evolution of positive air ions is mathematically simulated considering 150 trace gases and more than a thousand ion-molecule …
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Binary nucleation of water-sulfuric acid system: A reexamination of the classical hydrates interaction model

It is shown that the hydration correction for the free energy of cluster formation in the classical binary nucleation theory is not …
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Bursts of intermediate ions in atmospheric air

The mobility spectrum of air ions has been measured at Tahkuse Observatory in Estonia for several years. The average concentration of …
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Air ion measurements as a source of information about atmospheric aerosols

The mobility spectra of air ions recorded in the course of routine atmospheric electric measurements contain information about …
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Nucleation in the presence of air ions and aerosol particles

It is shown that the replacement of difference equations of cluster size distribution, in the standard way in classical nucleation …
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Derivation of the size spectrum of aerosol particles from a mobility spectrum

The mobility spectra of air ions measured in atmospheric electrical research give essential information about atmospheric aerosols. The …
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EVOLUTION OF NEGATIVE SMALL IONS AT ENHANCED IONIZATION

The paper deals with the modeling of the evolution(chemical kinetics) of tropospheric small ions for the case where the rate of ion …
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MOBILITY SPECTRUM OF AIR IONS AT TAHKUSE-OBSERVATORY

Mobility spectra of air ions have been measured at a rural site in Estonia during several periods. The annual average mobility spectrum …
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CHEMICAL-COMPOSITION OF SMALL ATMOSPHERIC IONS NEAR THE GROUND

The chemical composition of small ions has been studied by means of formal chemical kinetics. The model for negative ions contains 474 …
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About the calibration of the electrical aerosol spectrometer