Mikael Ehn
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View article: Supplementary material to "SIM-HOM (version 1.0): a Mechanistic Module for the formation of highly oxygenated organic molecules from Isoprene, Monoterpene and Sesquiterpene evaluated with ADCHAM (version 1.0)"
Supplementary material to "SIM-HOM (version 1.0): a Mechanistic Module for the formation of highly oxygenated organic molecules from Isoprene, Monoterpene and Sesquiterpene evaluated with ADCHAM (version 1.0)" Open
View article: Machine-Learning-Driven Reconstruction of Organic Aerosol Sources across Dense Monitoring Networks in Europe
Machine-Learning-Driven Reconstruction of Organic Aerosol Sources across Dense Monitoring Networks in Europe Open
Fine particulate matter (PM) poses a major threat to public health, with organic aerosol (OA) being a key component. Major OA sources, hydrocarbon-like OA (HOA), biomass burning OA (BBOA), and oxygenated OA (OOA), have distinct health and …
View article: SOA yields from C <sub>10</sub> alkanes and oxygenates
SOA yields from C <sub>10</sub> alkanes and oxygenates Open
Alkanes are hydrocarbons that are emitted into the atmosphere mainly by human activities such as combustion processes and via the use of volatile chemical products (VCPs). They are an important group of volatile organic compounds (VOCs) th…
View article: Analysis of source regions and transport pathways of sub-micron aerosol components in Europe
Analysis of source regions and transport pathways of sub-micron aerosol components in Europe Open
It is important to study aerosols and their origins, as they pose various negative health and environmental impacts. In this study, we combined year-long datasets from 15 different countries with Trajectory Statistical Methods (TSMs) for t…
View article: Unaccounted impacts of diterpene emissions on atmospheric aerosol loadings
Unaccounted impacts of diterpene emissions on atmospheric aerosol loadings Open
View article: Analysis of Source Regions and Transport Pathways of Sub-Micron Aerosol Components in Europe
Analysis of Source Regions and Transport Pathways of Sub-Micron Aerosol Components in Europe Open
View article: Finnish Centre of Excellence in Physics, Chemistry, Biology and Meteorology of Atmospheric Composition and Climate Change : summary and outlook
Finnish Centre of Excellence in Physics, Chemistry, Biology and Meteorology of Atmospheric Composition and Climate Change : summary and outlook Open
markku Kulmala1)*, hanna K. lappalainen1)2), Jaana Back1)3), ari laaksonen2)4), eero nikinmaa3), marja-liisa riekkola5), timo vesala1), Yrjo viisanen2), tuula aalto2), michael Boy1), miikka Dal maso6), mikael ehn1), hannele hakola2), Pertt…
View article: Measuring atmospheric ion bursts and their dynamics using mass spectrometry
Measuring atmospheric ion bursts and their dynamics using mass spectrometry Open
Atmospheric ions are produced after a cascade of reactions starting from initial ionization by high energetic radiation. Such ionization bursts generate ions that rapidly react and generate a suite of ion products. Primary ions are in the …
View article: Monoterpenes’ oxidation capacity and rate over a boreal forest : temporal variation and connection to growth of newly formed particles
Monoterpenes’ oxidation capacity and rate over a boreal forest : temporal variation and connection to growth of newly formed particles Open
View article: Monoterpene pollution episodes in a forest environment : indication of anthropogenic origin and association with aerosol particles
Monoterpene pollution episodes in a forest environment : indication of anthropogenic origin and association with aerosol particles Open
We used a monoterpene volume mixing ratio dataset measured from 12 June 2006 to 24 September 2007 and from 1 June 2008 to 3 March 2009 at the SMEAR II station to quantify the magnitude of anthropogenic monoterpene emissions aside from biog…
View article: Ion and particle number concentrations and size distributions along the Trans-Siberian railroad
Ion and particle number concentrations and size distributions along the Trans-Siberian railroad Open
Aerosol concentrations and properties in Russia are not well known. There are only few studies published on aerosols in Russia. However, these aerosols can have a major effect on global climate. We measured aerosol particle and air ion num…
View article: Unaccounted impacts of diterpene emissions on atmospheric aerosol loadings
Unaccounted impacts of diterpene emissions on atmospheric aerosol loadings Open
Diterpenes (C20H32) are commonly found in trees, but their emissions into the atmosphere were previously considered unlikely due to their low volatility. Consequently, they have been disregarded in atmospheric chemist…
View article: Supplementary material to "Gas-phase Observations of Accretion Products from Stabilized Criegee Intermediates in Terpene Ozonolysis with Two Dicarboxylic Acids"
Supplementary material to "Gas-phase Observations of Accretion Products from Stabilized Criegee Intermediates in Terpene Ozonolysis with Two Dicarboxylic Acids" Open
View article: Supplementary material to "Characterization of Brown Carbon absorption in different European environments through source contribution analysis"
Supplementary material to "Characterization of Brown Carbon absorption in different European environments through source contribution analysis" Open
View article: Comment on egusphere-2024-1386
Comment on egusphere-2024-1386 Open
Abstract. ∆3-carene is a prominent monoterpene in the atmosphere, contributing significantly to secondary organic aerosol (SOA) formation. However, knowledge about ∆3-carene oxidation pathways, partic…
View article: Recent advances in understanding secondary organic aerosol formation from ozonolysis of &#916;3-carene and other monoterpenes
Recent advances in understanding secondary organic aerosol formation from ozonolysis of Δ3-carene and other monoterpenes Open
It is important to investigate formation, composition and properties of secondary organic aerosol (SOA) from monoterpenes in order to develop an accurate understanding of their atmospheric chemistry, impact on the aerosol budget and the ef…
View article: Elucidating Isoprene Oxidation: Pathways to Highly Oxygenated Molecules formation
Elucidating Isoprene Oxidation: Pathways to Highly Oxygenated Molecules formation Open
Isoprene is globally recognized as the preeminent biogenic volatile organic compounds (BVOCs) and is the most extensively researched species among volatile organic compounds (VOCs). Nevertheless, prevailing global and regional atmospheric …
View article: On the potential use of highly oxygenated organic molecules (HOM) as indicators for ozone formation sensitivity
On the potential use of highly oxygenated organic molecules (HOM) as indicators for ozone formation sensitivity Open
Ozone (O3), an important and ubiquitous trace gas, protects lives from harm of solar ultraviolet (UV) radiation in the stratosphere but is toxic to living organisms in the troposphere. Additionally, tropospheric O3 is a key oxidant, and so…
View article: Advances in the Vaporization Inlet for Aerosols (VIA) for Online Measurements of Particulate Highly Oxygenated Organic Molecules (HOM)
Advances in the Vaporization Inlet for Aerosols (VIA) for Online Measurements of Particulate Highly Oxygenated Organic Molecules (HOM) Open
Particulate matter significantly influences global climate and human health, necessitating accurate measurement techniques for understanding its composition. Many methods, both offline and online, have been employed over the years to achie…
View article: Elucidating formation of highly oxygenated organic molecules (HOMs) from &#945;-pinene ozonolysis with isotopic labelling
Elucidating formation of highly oxygenated organic molecules (HOMs) from α-pinene ozonolysis with isotopic labelling Open
Upon oxidation, some volatile organic compounds (VOCs) have been shown to go through a rapid process called autoxidation forming highly oxygenated organic molecules (HOMs). The exact autoxidation pathway taken affects the formation rates a…
View article: Emissions of biogenic volatiles from the coastal waters of Gulf of Finland, Baltic Sea.
Emissions of biogenic volatiles from the coastal waters of Gulf of Finland, Baltic Sea. Open
The dearth of measurements of Volatile Organic Compounds (VOCs) in the marine boundary layer have raised question on how the marine environment is impacted or can impact the overlying atmosphere. VOCs emissions in the interface between air…
View article: Measurements of Atmospheric Aerosol with the Vaporization Inlet for Aerosols and the Filter Inlet for Gases and Aerosols on a Bipolar Multi-Reagent Chemical Ionization Mass Spectrometer
Measurements of Atmospheric Aerosol with the Vaporization Inlet for Aerosols and the Filter Inlet for Gases and Aerosols on a Bipolar Multi-Reagent Chemical Ionization Mass Spectrometer Open
Atmospheric aerosols can be composed of a wide variety of organic and inorganic chemicals, which can dramatically affect the environmental impact of the particles. Understanding the chemical composition of aerosol assists in understanding …
View article: Towards understanding aromatic SOA by studying the molecular level oxidations mechanisms of xylene isomers
Towards understanding aromatic SOA by studying the molecular level oxidations mechanisms of xylene isomers Open
Aromatic compounds like xylene contribute significantly to the formation of tropospheric secondary organic aerosol (SOA) that have strong implications on health and on climate. The sources of this class of molecules are primarily anthropog…
View article: Formation and temperature dependence of Highly Oxygenated Organic Molecules from &#8710;3-carene ozonolysis
Formation and temperature dependence of Highly Oxygenated Organic Molecules from ∆3-carene ozonolysis Open
Monoterpenes, comprising 15% of global biogenic volatile organic compound emissions, play a pivotal role in atmospheric chemistry. ∆3-carene, the second most prevalent monoterpene, has been identified as a significant source of secon…
View article: Dataset from 'Influence of anthropogenic emissions on the composition of highly oxygenated organic molecules in Helsinki: a street canyon and urban background station comparison'
Dataset from 'Influence of anthropogenic emissions on the composition of highly oxygenated organic molecules in Helsinki: a street canyon and urban background station comparison' Open
This dataset supplements the following manuscript: Okuljar, M., Garmash, O., Olin, M., Kalliokoski, J., Timonen, H., Niemi, J. V., Paasonen, P., Kontkanen, J., Zhang, Y., Hellén, H., Kuuluvainen, H., Aurela, M., Manninen, H. E., Sipilä, M.…
View article: Dataset from 'Influence of anthropogenic emissions on the composition of highly oxygenated organic molecules in Helsinki: a street canyon and urban background station comparison'
Dataset from 'Influence of anthropogenic emissions on the composition of highly oxygenated organic molecules in Helsinki: a street canyon and urban background station comparison' Open
This dataset supplements the following manuscript: Okuljar, M., Garmash, O., Olin, M., Kalliokoski, J., Timonen, H., Niemi, J. V., Paasonen, P., Kontkanen, J., Zhang, Y., Hellén, H., Kuuluvainen, H., Aurela, M., Manninen, H. E., Sipilä, M.…
View article: Humidity dependence of denuder?
Humidity dependence of denuder? Open
Abstract. Particulate matter has major climate and health impacts, and it is therefore of utmost importance to be able to measure the composition of these particles to gain insights into their sources and characteristics. …
View article: Supplementary material to "Characterization of the Vaporization Inlet for Aerosols (VIA) for Online Measurements of Particulate Highly Oxygenated Organic Molecules (HOMs)"
Supplementary material to "Characterization of the Vaporization Inlet for Aerosols (VIA) for Online Measurements of Particulate Highly Oxygenated Organic Molecules (HOMs)" Open
Section S1. Evaporation rate of compound XThe evaporation rate of a compound from an aerosol particle that has been used for modeling the FIGAERO thermograms is (Schobesberger et al., 2018): : number of molecules indexed . : Boltzmanns con…
View article: Supplementary material to "Influence of anthropogenic emissions on the composition of highly oxygenated organic molecules in Helsinki: a street canyon and urban background station comparison"
Supplementary material to "Influence of anthropogenic emissions on the composition of highly oxygenated organic molecules in Helsinki: a street canyon and urban background station comparison" Open
Variable [unit] Instrument / model Height of measurement (m) Urban background station NO, NOx [ppb] chemiluminescence analyzer / Horiba APNA 370 4 O3 UV-absoption / Teledyne Instruments API 400E 4 SO2 [ppb] UV fluorescence analyzer / Therm…
View article: Data set for article "Selective deuteration as a tool for resolving autoxidation mechanisms in a-pinene ozonolysis"
Data set for article "Selective deuteration as a tool for resolving autoxidation mechanisms in a-pinene ozonolysis" Open
The data set for publication "Selective deuteration as a tool for resolving autoxidation mechanisms in a-pinene ozonolysis" (preprint https://doi.org/10.5194/egusphere-2022-1131). Contains raw data files for the CI-orbitrap mass spectromet…