Results 1 to 10 of about 97,786 (249)

Effects of marine fuel sulfur restrictions on particle number concentrations and size distributions in ship plumes in the Baltic Sea [PDF]

Atmospheric Chemistry and Physics, 2021
Exhaust emissions from shipping are a major contributor to particle concentrations in coastal and marine areas. Previously, the marine fuel sulfur content (FSC) was restricted globally to 4.5 m/m%, but the limit was changed to 3.5 m/m% at the beginning ...
S. D. Seppälä, J. Kuula, A.-P. Hyvärinen, S. Saarikoski, T. Rönkkö, J. Keskinen, J.-P. Jalkanen, H. Timonen   +7 more
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In-depth characterization of submicron particulate matter inter-annual variations at a street canyon site in northern Europe [PDF]

Atmospheric Chemistry and Physics, 2021
Atmospheric aerosols play an important role in air pollution. Aerosol particle chemical composition is highly variable depending on the season, hour of the day, day of the week, meteorology, and location of the measurement site.
L. M. F. Barreira, A. Helin, M. Aurela, K. Teinilä, M. Friman, L. Kangas, J. V. Niemi, H. Portin, A. Kousa, L. Pirjola, T. Rönkkö, S. Saarikoski, H. Timonen   +12 more
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Sesquiterpenes dominate monoterpenes in northern wetland emissions [PDF]

Atmospheric Chemistry and Physics, 2020
We have studied biogenic volatile organic compound (BVOC) emissions and their ambient concentrations at a sub-Arctic wetland (Lompolojänkkä, Finland), which is an open, nutrient-rich sedge fen and a part of the Pallas-Sodankylä Global Atmosphere Watch ...
H. Hellén, S. Schallhart, A. P. Praplan, T. Tykkä, M. Aurela, A. Lohila, A. Lohila, H. Hakola   +7 more
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Undetected biogenic volatile organic compounds from Norway spruce drive total ozone reactivity measurements [PDF]

Atmospheric Chemistry and Physics, 2023
Biogenic volatile organic compounds (BVOCs) are continuously emitted from terrestrial vegetation into the atmosphere and react with various atmospheric oxidants, with ozone being an important one.
S. J. Thomas, S. J. Thomas, T. Tykkä, H. Hellén, F. Bianchi, A. P. Praplan   +5 more
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Characterization of volatile organic compounds and submicron organic aerosol in a traffic environment [PDF]

Atmospheric Chemistry and Physics, 2023
Urban air consists of a complex mixture of gaseous and particulate species from anthropogenic and biogenic sources that are further processed in the atmosphere.
S. Saarikoski, H. Hellén, A. P. Praplan, S. Schallhart, P. Clusius, J. V. Niemi, A. Kousa, T. Tykkä, R. Kouznetsov, M. Aurela, L. Salo, T. Rönkkö, L. M. F. Barreira, L. Pirjola, L. Pirjola, H. Timonen   +15 more
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Sensitivity analysis of the meteorological preprocessor MPP-FMI 3.0 using algorithmic differentiation [PDF]

Geoscientific Model Development, 2017
The meteorological input parameters for urban- and local-scale dispersion models can be evaluated by preprocessing meteorological observations, using a boundary-layer parameterisation model.
J. Backman, C. R. Wood, M. Auvinen, M. Auvinen, L. Kangas, H. Hannuniemi, A. Karppinen, J. Kukkonen   +7 more
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Aerosol size distribution seasonal characteristics measured in Tiksi, Russian Arctic [PDF]

Atmospheric Chemistry and Physics, 2016
Four years of continuous aerosol number size distribution measurements from the Arctic Climate Observatory in Tiksi, Russia, are analyzed. Tiksi is located in a region where in situ information on aerosol particle properties has not been previously ...
E. Asmi, V. Kondratyev, V. Kondratyev, D. Brus, T. Laurila, H. Lihavainen, J. Backman, V. Vakkari, M. Aurela, J. Hatakka, Y. Viisanen, T. Uttal, V. Ivakhov, A. Makshtas   +13 more
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OH reactivity from the emissions of different tree species: investigating the missing reactivity in a boreal forest [PDF]

Biogeosciences, 2020
In forested area, a large fraction of total hydroxyl radical (OH) reactivity remains unaccounted for. Very few studies have looked at the variations in total OH reactivity from biogenic emissions.
A. P. Praplan, T. Tykkä, S. Schallhart, V. Tarvainen, J. Bäck, H. Hellén   +5 more
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Emissions of volatile organic compounds from Norway spruce and potential atmospheric impacts

Frontiers in Forests and Global Change, 2023
Published biogenic volatile organic compound (BVOC) emission rates of Norway spruces vary a lot. In this study we combined published Norway spruce emission rates measured in boreal forests and added our new, unpublished emission data from Southern (SF ...
Hannele Hakola, Ditte Taipale, Ditte Taipale, Arnaud Praplan, Simon Schallhart, Steven Thomas, Toni Tykkä, Aku Helin, Jaana Bäck, Heidi Hellén   +9 more
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Applications and limitations of constrained high-resolution peak fitting on low resolving power mass spectra from the ToF-ACSM [PDF]

Atmospheric Measurement Techniques, 2016
The applicability, methods and limitations of constrained peak fitting on mass spectra of low mass resolving power (m∕Δm50 ∼ 500) recorded with a time-of-flight aerosol chemical speciation monitor (ToF-ACSM) are explored. Calibration measurements as well
H. Timonen, M. Cubison, M. Aurela, D. Brus, H. Lihavainen, R. Hillamo, M. Canagaratna, B. Nekat, R. Weller, D. Worsnop, S. Saarikoski   +10 more
doaj   +1 more source