Janne Lampilahti
A5061586279- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Air Quality and Health Impacts
- Atmospheric Ozone and Climate
- Air Quality Monitoring and Forecasting
- Atmospheric and Environmental Gas Dynamics
- Smart Materials for Construction
- Marine and coastal ecosystems
- Cryospheric studies and observations
- Vehicle emissions and performance
- Fire effects on ecosystems
- Methane Hydrates and Related Phenomena
- Mass Spectrometry Techniques and Applications
- Aquatic Ecosystems and Phytoplankton Dynamics
- Cyclone Separators and Fluid Dynamics
- Particle Dynamics in Fluid Flows
- Peatlands and Wetlands Ecology
- Polar Research and Ecology
- Geological Studies and Exploration
- Plant responses to elevated CO2
- Plant Ecology and Soil Science
- Chemical and Physical Studies
- Ion-surface interactions and analysis
- Wind and Air Flow Studies
- COVID-19 impact on air quality
University of Helsinki
2015-2024
King Abdulaziz University
2023
University of Rochester
2023
University of Jordan
2023
Helsinki Institute of Physics
2016-2019
Significance Aerosol particles can form and grow by gas-to-particle conversion eventually act as seeds for cloud droplets, influencing global climate. Volatile organic compounds emitted from plants are oxidized in the atmosphere, resulting products drive particle growth. We measure growth biogenic vapors with a well-controlled laboratory setup over wide range of tropospheric temperatures. While higher temperatures lead to increased reaction rates concentrations highly molecules, lower allow...
Abstract New particle formation in the Arctic atmosphere is an important source of aerosol particles. Understanding processes secondary crucial due to their significant impact on cloud properties and therefore amplification. We observed molecular new particles from low‐volatility vapors at two sites with differing surroundings. In Svalbard, sulfuric acid (SA) methane sulfonic (MSA) contribute some extent condensation nuclei (CCN). This occurs via ion‐induced nucleation SA NH 3 subsequent...
The 2017–2019 hourly particle number size distributions (PNSD) from 26 sites in Europe and 1 the US were evaluated focusing on 16 urban background (UB) 6 traffic (TR) framework of Research Infrastructures services reinforcing air quality monitoring capacities European URBAN & industrial areaS (RI-URBANS) project. main objective was to describe phenomenology ultrafine particles (UFP) with a significant focus. varying lower detection limits made it difficult compare PN concentrations (PNC),...
Abstract. Nucleation of atmospheric vapours produces more than half global cloud condensation nuclei and so has an important influence on climate. Recent studies show that monoterpene (C10H16) oxidation yields highly oxygenated products can nucleate with or without sulfuric acid. Monoterpenes are emitted mainly by trees, frequently together isoprene (C5H8), which the highest emission all organic vapours. Previous have shown suppresses new-particle formation from monoterpenes, but cause this...
Abstract. New particle formation (NPF) is a significant source of atmospheric particles, affecting climate and air quality. Understanding the mechanisms involved in urban aerosols important to develop effective mitigation strategies. However, NPF rates reported polluted boundary layer span more than 4 orders magnitude, reasons behind this variability are subject intense scientific debate. Multiple vapours have been postulated participate NPF, including sulfuric acid, ammonia, amines...
Abstract. According to current estimates, atmospheric new particle formation (NPF) produces a large fraction of aerosol particles and cloud condensation nuclei in the Earth's atmosphere, which have implications for health climate. Despite recent advances, NPF is still insufficiently understood lower troposphere, especially above mixed layer (ML). This paper presents results from co-located airborne ground-based measurements boreal forest environment, showing that many events (∼42 %) appear...
This study aims to picture the phenomenology of urban ambient total lung deposited surface area (LDSA) (including head/throat (HA), tracheobronchial (TB), and alveolar (ALV) regions) based on multiple path particle dosimetry (MPPD) model during 2017-2019 period collected from background (UB, n = 15), traffic (TR, 6), suburban (SUB, 4), regional (RB, 1) monitoring sites in Europe (25) USA (1). Briefly, spatial-temporal distribution characteristics deposition LDSA, including diel, weekly,...
Ultrafine particles (UFP, those with diameters ≤ 100 nm), have been reported to potentially penetrate deeply into the respiratory system, translocate through alveoli, and affect various organs, correlating increased mortality. The aim of this study is assess long-term trends (5–11 years) in mostly urban UFP concentrations based on measurements particle number size distributions (PNSD). Additionally, other pollutants meteorological variables were evaluated support interpretations. PNSD...
Abstract. Atmospheric new-particle formation (NPF) is a worldwide-observed phenomenon that affects the human health and global climate. With growing network of atmospheric measurement stations, efforts towards investigating NPF have increased. In this study, we present an automated method to classify days into four categories including events, non-events two classes in between, which then ensures reproducibility minimizes hours spent on manual classification. We applied our 10 years data...
Abstract. In a warming Arctic the increased occurrence of new particle formation (NPF) is believed to originate from declining ice coverage during summertime. Understanding physico-chemical properties newly formed particles, as well mechanisms that control both and growth in this pristine environment, important for interpreting aerosol–cloud interactions, which climate can be highly sensitive. investigation, we present analysis NPF high summer Arctic. The measurements were made on-board...
Abstract. This work presents airborne observations of sub-3 nm particles in the lower troposphere and investigates new particle formation (NPF) within an evolving boundary layer (BL). We studied concentrations together with supporting gas meteorological data inside planetary BL over a boreal forest site Hyytiälä, southern Finland. The analysed were collected during three flight measurement campaigns: May–June 2015, August 2015 April–May 2017, including 27 morning 26 afternoon vertical...
Abstract. The formation of ice particles in Earth's atmosphere strongly influences the dynamics and optical properties clouds their impacts on climate system. Ice is often triggered heterogeneously by ice-nucleating (INPs) that represent a very low number atmosphere. To date, many sources INPs, such as mineral soil dust, have been investigated identified mid latitudes. Although less known about nucleation at high latitudes, efforts made to identify INPs Arctic boreal environments. In this...
Abstract. Atmospheric aerosol particles have a considerable influence on climate via both aerosol–radiation and aerosol–cloud interactions. A major fraction of global particles, in terms their number concentration, is due to atmospheric new particle formation (NPF) that involves neutral charged clusters particles. NPF the source intermediate ions, i.e., with mobility diameters between approx. 2 7 nm. We investigate ion concentrations 1.7 3.1 nm at SMEAR II (Station for Measuring Forest...
Abstract. Air ions play a crucial role in the new particle formation (NPF), which turn has potential to influence global intermediate and 7–20 nm large ions) at two “flagship” sites: SMEAR II site boreal forest of Finland SORPES megacity eastern China. ion number size distributions (0.8–42 nm) were measured using Neutral Cluster Ion Spectrometer (NAIS) these sites from June 2019 August 2020. Our study aims characterize similarities differences characteristics their contributions NPF between...
Abstract. New particle formation (NPF) plays a critical role in atmospheric processes and climate dynamics. Its mechanisms impacts remain poorly understood remote regions like Siberia. In this study, we used the data set from long-term campaign (2019–2021) employing spectrometers (NAIS DMPS) to investigate NPF at boreal forest site Western So far, is longest dataset for statistics of Siberian NPF. We classified events, calculated growth rates, performed nanoparticle ranking analysis. Similar...
Abstract. New particle formation (NPF) is the phenomenon wherein gaseous precursors form critical clusters of barely a few nanometres in diameter, after which, under favourable conditions these particles can grow to climate-relevant sizes. Here we present measurements from 2022 2024 and ion number size distributions Zeppelin Observatory (ZEP), an Arctic research station situated on western edge Svalbard. NPF events begin April continue occurring into November. The at start season (i.e....
Impact of lockdown measures on the air pollutants and particle number size distribution.
Abstract. The metallurgical industry in the Kola Peninsula, north-west Russia, form, after Norilsk, Siberia, second largest source of air pollution Arctic and subarctic domain. Sulfur dioxide (SO2) emissions from ore smelters are transported to wide areas, including Finnish Lapland. We performed investigations on concentrations SO2, aerosol precursor vapours, ion cluster size distributions together with chemical composition measurements freshly formed clusters at SMEAR I station Lapland...
Abstract Aerosols and their interaction with clouds constitute the largest uncertainty in estimating radiative forcing affecting climate system. Secondary aerosol formation is responsible for a large fraction of cloud condensation nuclei global atmosphere. Wetlands are important to budgets methane carbon dioxide, but potential role wetlands has not been investigated. Here we use direct atmospheric sampling at Siikaneva wetland Finland investigate emission volatile organic compounds,...
Abstract. Understanding chemical processes leading to the formation of atmospheric aerosol particles is crucial improve our capabilities in predicting future climate. However, those mechanisms are still inadequately characterized, especially polar regions. In this study, we report observations neutral and charged precursor molecules cluster composition (qualitatively quantitatively), as well air ions particle number concentrations size distributions from Marambio research station (64∘15′ S,...
Abstract. Atmospheric aerosol particles have considerable influences on climate via both aerosol-radiation and aerosol-cloud interactions. A major fraction of global particles, in terms their number concentration, is due to atmospheric new particle formation (NPF) that involves neutral charged clusters particles. NPF the source intermediate ions, i.e., with mobility diameters between approx. 2 7 nm. We investigate ion concentrations 1.7 3.1 nm at SMEAR II measurement station Hyytiälä,...