J
Jani Hakala
Researcher at University of Helsinki
Publications - 56
Citations - 5654
Jani Hakala is an academic researcher from University of Helsinki. The author has contributed to research in topics: Aerosol & Nucleation. The author has an hindex of 28, co-authored 54 publications receiving 4516 citations. Previous affiliations of Jani Hakala include Carnegie Mellon University.
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Journal ArticleDOI
Direct observations of atmospheric aerosol nucleation.
Markku Kulmala,Jenni Kontkanen,Heikki Junninen,Katrianne Lehtipalo,Hanna E. Manninen,Tuomo Nieminen,Tuomo Nieminen,Tuukka Petäjä,Mikko Sipilä,Siegfried Schobesberger,Pekka Rantala,Alessandro Franchin,Tuija Jokinen,Emma Järvinen,Mikko Äijälä,Juha Kangasluoma,Jani Hakala,P. P. Aalto,Pauli Paasonen,Jyri Mikkilä,Joonas Vanhanen,Juho Aalto,Hannele Hakola,Ulla Makkonen,Taina Ruuskanen,Roy L. Mauldin,Roy L. Mauldin,Jonathan Duplissy,Hanna Vehkamäki,Jaana Bäck,Aki Kortelainen,Ilona Riipinen,Theo Kurtén,Murray V. Johnston,James N. Smith,James N. Smith,Mikael Ehn,Mikael Ehn,Thomas F. Mentel,Kari E. J. Lehtinen,Kari E. J. Lehtinen,Ari Laaksonen,Ari Laaksonen,Veli-Matti Kerminen,Douglas R. Worsnop +44 more
TL;DR: Three separate size regimes below 2-nm diameter are identified that build up a physically, chemically, and dynamically consistent framework on atmospheric nucleation—more specifically, aerosol formation via neutral pathways.
Journal ArticleDOI
Molecular understanding of sulphuric acid-amine particle nucleation in the atmosphere
Joao Almeida,Joao Almeida,Siegfried Schobesberger,Andreas Kürten,Ismael K. Ortega,Oona Kupiainen-Määttä,Arnaud P. Praplan,Alexey Adamov,António Amorim,F. Bianchi,Martin Breitenlechner,A. David,Josef Dommen,Neil M. Donahue,Andrew J. Downard,Eimear M. Dunne,Jonathan Duplissy,Sebastian Ehrhart,Richard C. Flagan,Alessandro Franchin,Roberto Guida,Jani Hakala,Armin Hansel,Martin Heinritzi,Henning Henschel,Tuija Jokinen,Heikki Junninen,Maija Kajos,Juha Kangasluoma,Helmi Keskinen,Agnieszka Kupc,Theo Kurtén,Alexander N. Kvashin,Ari Laaksonen,Ari Laaksonen,Katrianne Lehtipalo,Markus Leiminger,Johannes Leppä,Ville Loukonen,Vladimir Makhmutov,Serge Mathot,Matthew J. McGrath,Tuomo Nieminen,Tuomo Nieminen,Tinja Olenius,Antti Onnela,Tuukka Petäjä,Francesco Riccobono,Ilona Riipinen,Matti P. Rissanen,Linda Rondo,Taina Ruuskanen,Filipe Duarte Santos,Nina Sarnela,Simon Schallhart,R. Schnitzhofer,John H. Seinfeld,Mario Simon,Mikko Sipilä,Mikko Sipilä,Yuri Stozhkov,Frank Stratmann,António Tomé,Jasmin Tröstl,Georgios Tsagkogeorgas,Petri Vaattovaara,Yrjö Viisanen,Annele Virtanen,Aron Vrtala,Paul E. Wagner,Ernest Weingartner,Heike Wex,Christina Williamson,Daniela Wimmer,Daniela Wimmer,Penglin Ye,Taina Yli-Juuti,Kenneth S. Carslaw,Markku Kulmala,Markku Kulmala,Joachim Curtius,Urs Baltensperger,Douglas R. Worsnop,Hanna Vehkamäki,Jasper Kirkby,Jasper Kirkby +85 more
TL;DR: The results show that, in regions of the atmosphere near amine sources, both amines and sulphur dioxide should be considered when assessing the impact of anthropogenic activities on particle formation.
Journal ArticleDOI
Radiative Absorption Enhancements Due to the Mixing State of Atmospheric Black Carbon
Christopher D. Cappa,Timothy B. Onasch,Paola Massoli,Douglas R. Worsnop,Timothy S. Bates,Eben S. Cross,Paul Davidovits,Jani Hakala,Katherine Hayden,B. Tom Jobson,Katheryn R. Kolesar,Daniel A. Lack,Daniel A. Lack,Brian M. Lerner,Brian M. Lerner,Shao-Meng Li,Daniel Mellon,I. Nuaaman,I. Nuaaman,Jason S. Olfert,Tuukka Petäjä,Patricia K. Quinn,Chen Song,R. Subramanian,Eric J. Williams,Rahul A. Zaveri +25 more
TL;DR: Direct measurements show that ambient atmospheric particulate black carbon absorbs less solar radiation than theory suggested, suggesting that many climate models may be overestimating the amount of warming caused by black carbon emissions.
Journal ArticleDOI
Ion-induced nucleation of pure biogenic particles
Jasper Kirkby,Jasper Kirkby,Jonathan Duplissy,Jonathan Duplissy,Kamalika Sengupta,Carla Frege,Hamish Gordon,Christina Williamson,Christina Williamson,Martin Heinritzi,Martin Heinritzi,Mario Simon,Chao Yan,Joao Almeida,Joao Almeida,Jasmin Tröstl,Tuomo Nieminen,Tuomo Nieminen,Ismael K. Ortega,Robert Wagner,Alexey Adamov,António Amorim,Anne-Kathrin Bernhammer,F. Bianchi,F. Bianchi,Martin Breitenlechner,Sophia Brilke,Xuemeng Chen,J. S. Craven,Antonio Dias,Sebastian Ehrhart,Sebastian Ehrhart,Richard C. Flagan,Alessandro Franchin,Claudia Fuchs,Roberto Guida,Jani Hakala,Christopher R. Hoyle,Tuija Jokinen,Heikki Junninen,Juha Kangasluoma,Jaeseok Kim,Jaeseok Kim,Manuel Krapf,Andreas Kürten,Ari Laaksonen,Ari Laaksonen,Katrianne Lehtipalo,Katrianne Lehtipalo,Vladimir Makhmutov,Serge Mathot,Ugo Molteni,Antti Onnela,Otso Peräkylä,Felix Piel,Tuukka Petäjä,Arnaud P. Praplan,Kirsty J. Pringle,Alexandru Rap,N. A. D. Richards,Ilona Riipinen,Matti P. Rissanen,Linda Rondo,Nina Sarnela,Siegfried Schobesberger,Siegfried Schobesberger,Catherine E. Scott,John H. Seinfeld,Mikko Sipilä,Mikko Sipilä,Gerhard Steiner,Gerhard Steiner,Gerhard Steiner,Yuri Stozhkov,Frank Stratmann,António Tomé,Annele Virtanen,Alexander L. Vogel,Andrea Christine Wagner,Paul E. Wagner,Ernest Weingartner,Daniela Wimmer,Daniela Wimmer,Paul M. Winkler,Penglin Ye,Xuan Zhang,Armin Hansel,Josef Dommen,Neil M. Donahue,Douglas R. Worsnop,Douglas R. Worsnop,Urs Baltensperger,Markku Kulmala,Markku Kulmala,Kenneth S. Carslaw,Joachim Curtius +95 more
TL;DR: Ion-induced nucleation of pure organic particles constitutes a potentially widespread source of aerosol particles in terrestrial environments with low sulfuric acid pollution.
Journal ArticleDOI
Atmospheric sulphuric acid and neutral cluster measurements using CI-APi-TOF
Tuija Jokinen,Mikko Sipilä,Heikki Junninen,Mikael Ehn,Gustaf Lönn,Jani Hakala,Tuukka Petäjä,Roy L. Mauldin,Roy L. Mauldin,Markku Kulmala,D. R. Worsnop +10 more
TL;DR: In this paper, the first ambient measurements using nitrate ion based Chemical Ionization with the Atmospheric Pressure interface Time-Of-Flight mass spectrometer (CI-APi-TOF) for sulphuric acid and neutral cluster detection are presented.