Search Results

• • 20 

    Academic Journals

  • Sort by: sorttype.publication.date.desc Newest sorttype.publication.date.asc Oldest sorttype.relevance Relevance

• Observations of particle number size distributions and new particle formation in six Indian locations.

  Authors:Mathew Sebastian, Sobhan Kumar Kompalli, Vasudevan Anil Kumar, Sandhya Jose, S. Suresh Babu, Govindan Pandithurai, et al.From:Atmospheric Chemistry and Physics (Vol. 22, Issue 7) Peer-Reviewed

  Apr. 7, 2022366 words Brief article Atmospheric new particle formation (NPF) is a crucial process driving aerosol number concentrations in the atmosphere; it can significantly impact the evolution of atmospheric aerosol and cloud processes. This study...

• Seasonality of the particle number concentration and size distribution: a global analysis retrieved from the network of Global Atmosphere Watch (GAW) near-surface observatories.

  Authors:Clémence Rose, Martine Collaud Coen, Elisabeth Andrews, Yong Lin, Isaline Bossert, Cathrine Lund Myhre, et al.From:Atmospheric Chemistry and Physics (Vol. 21, Issue 22) Peer-Reviewed

  Nov. 25, 2021594 words Article Aerosol particles are a complex component of the atmospheric system which influence climate directly by interacting with solar radiation, and indirectly by contributing to cloud formation. The variety of their sources,...

• Evaluation of convective boundary layer height estimates using radars operating at different frequency bands.

  Authors:Anna Franck, Dmitri Moisseev, Ville Vakkari, Matti Leskinen, Janne Lampilahti, Veli-Matti Kerminen, et al.From:Atmospheric Measurement Techniques (Vol. 14, Issue 11) Peer-Reviewed

  Nov. 24, 2021383 words Brief article Knowledge of the atmospheric boundary layer state and evolution is important for understanding air pollution and low-level cloud development, among other things. There are a number of instruments and methods that are...

• Impact of pyruvic acid photolysis on acetaldehyde and peroxy radical formation in the boreal forest: theoretical calculations and model results.

  Authors:Philipp G. Eger, Luc Vereecken, Rolf Sander, Jan Schuladen, Nicolas Sobanski, Horst Fischer, et al.From:Atmospheric Chemistry and Physics (Vol. 21, Issue 18) Peer-Reviewed

  Sept. 28, 2021433 words Article Based on the first measurements of gas-phase pyruvic acid (CH.sub.3 C(O)C(O)OH) in the boreal forest, we derive effective emission rates of pyruvic acid and compare them with monoterpene emission rates over the diel...

• Measurement report: Properties of aerosol and gases in the vertical profile during the LAPSE-RATE campaign.

  Authors:David Brus, Jani Gustafsson, Ville Vakkari, Osku Kemppinen, Gijs de Boer, and Anne HirsikkoFrom:Atmospheric Chemistry and Physics (Vol. 21, Issue 1) Peer-Reviewed

  Jan. 15, 2021211 words Brief article Unmanned aerial systems (UASs) are increasingly being used as observation platforms for atmospheric applications. The Lower Atmospheric Process Studies at Elevation - a Remotely-piloted Aircraft Team Experiment...

• Long-term total OH reactivity measurements in a boreal forest

  Authors:Arnaud P. Praplan, Toni Tykka, Dean Chen, Michael Boy, Ditte Taipale, Ville Vakkari, et al.From:Atmospheric Chemistry and Physics (Vol. 19, Issue 23) Peer-Reviewed

  Nov. 29, 2019399 words Brief article Total hydroxyl radical (OH) reactivity measurements were conducted at the second Station for Measuring Ecosystem-Atmosphere Relations (SMEAR II), a boreal forest site located in Hyytiälä, Finland, from April...

• Atmospheric trace metals measured at a regional background site (Welgegund) in South Africa

  Authors:Andrew D. Venter, Pieter G. van Zyl, Johan P. Beukes, Micky Josipovic, Johan Hendriks, Ville Vakkari, et al.From:Atmospheric Chemistry and Physics (Vol. 17, Issue 6) Peer-Reviewed

  Mar. 29, 2017441 words Brief article Atmospheric trace metals can cause a variety of health-related and environmental problems. Only a few studies on atmospheric trace metal concentrations have been conducted in South Africa. Therefore the aim of this...

• Seasonal influences on surface ozone variability in continental South Africa and implications for air quality

  Authors:Tracey Leah Laban, Pieter Gideon van Zyl, Johan Paul Beukes, Ville Vakkari, Kerneels Jaars, Nadine Borduas-Dedekind, et al.From:Atmospheric Chemistry and Physics (Vol. 18, Issue 20) Peer-Reviewed

  Oct. 29, 2018366 words Author abstract, Bri...

  Although elevated surface ozone (O.sub.3) concentrations are observed in many areas within southern Africa, few studies have investigated the regional atmospheric chemistry and dominant atmospheric processes driving...

• New particle formation, growth and apparent shrinkage at a rural background site in western Saudi Arabia

  Authors:Simo Hakala, Mansour A. Alghamdi, Pauli Paasonen, Ville Vakkari, Mamdouh I. Khoder, Kimmo Neitola, et al.From:Atmospheric Chemistry and Physics (Vol. 19, Issue 16) Peer-Reviewed

  Aug. 21, 2019355 words Author abstract, Bri...

  Atmospheric aerosols have significant effects on human health and the climate. A large fraction of these aerosols originates from secondary new particle formation (NPF), where atmospheric vapors form small particles...

• Long-term measurements of volatile organic compounds highlight the importance of sesquiterpenes for the atmospheric chemistry of a boreal forest

  Authors:Arnaud P. Praplan, Ilona Ylivinkka, Ville Vakkari, Markku Kulmala, and Hannele HakolaFrom:Atmospheric Chemistry and Physics (Vol. 18, Issue 19) Peer-Reviewed

  Oct. 1, 2018336 words Author abstract, Bri...

  The concentrations of terpenoids (isoprene; monoterpenes, MTs; and sesquiterpenes, SQTs) and oxygenated volatile organic compounds (OVOCs; i.e. aldehydes, alcohols, acetates and volatile organic acids, VOAs) were...

• Spatial, temporal and source contribution assessments of black carbon over the northern interior of South Africa

  Authors:Kgaugelo Euphinia Chiloane, Johan Paul Beukes, Pieter Gideon van Zyl, Petra Maritz, Ville Vakkari, Miroslav Josipovic, et al.From:Atmospheric Chemistry and Physics (Vol. 17, Issue 10) Peer-Reviewed

  May 19, 2017454 words Author abstract, Bri... After carbon dioxide (CO.sub.2 ), aerosol black carbon (BC) is considered to be the second most important contributor to global warming. This paper presents equivalent black carbon (eBC) (derived from an optical...

• Aerosol particle formation in the upper residual layer.

  Authors:Janne Lampilahti, Katri Leino, Antti Manninen, Pyry Poutanen, Anna Franck, Maija Peltola, et al.From:Atmospheric Chemistry and Physics (Vol. 21, Issue 10) Peer-Reviewed

  May 25, 2021211 words Brief article 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 and...

• Aerosol particle depolarization ratio at 1565 nm measured with a Halo Doppler lidar.

  Authors:Ville Vakkari, Holger Baars, Stephanie Bohlmann, Johannes Bühl, Mika Komppula, Rodanthi-Elisavet Mamouri, et al.From:Atmospheric Chemistry and Physics (Vol. 21, Issue 8) Peer-Reviewed

  Apr. 19, 2021242 words Brief article The depolarization ratio is a valuable parameter for lidar-based aerosol categorization. Usually, the aerosol particle depolarization ratio is determined at relatively short wavelengths of 355 nm and/or 532 nm, but some...

• A global analysis of climate-relevant aerosol properties retrieved from the network of Global Atmosphere Watch (GAW) near-surface observatories.

  Authors:Paolo Laj, Alessandro Bigi, Clémence Rose, Elisabeth Andrews, Cathrine Lund Myhre, Martine Collaud Coen, et al.From:Atmospheric Measurement Techniques (Vol. 13, Issue 8) Peer-Reviewed

  Aug. 17, 2020304 words Brief article Aerosol particles are essential constituents of the Earth's atmosphere, impacting the earth radiation balance directly by scattering and absorbing solar radiation, and indirectly by acting as cloud condensation nuclei....

• Measurements of biogenic volatile organic compounds at a grazed savannah grassland agricultural landscape in South Africa

  Authors:Kerneels Jaars, Pieter G. van Zyl, Johan P. Beukes, Ville Vakkari, Micky Josipovic, Andrew D. Venter, et al.From:Atmospheric Chemistry and Physics (Vol. 16, Issue 24) Peer-Reviewed

  Dec. 20, 2016512 words Author abstract, Bri... Biogenic volatile organic compounds (BVOCs) play an important role in the chemistry of the troposphere, especially in the formation of tropospheric ozone (O.sub.3) and secondary organic aerosols (SOA). Ecosystems...

• Robust observational constraint of uncertain aerosol processes and emissions in a climate model and the effect on aerosol radiative forcing.

  Authors:Jill S. Johnson, Leighton A. Regayre, Masaru Yoshioka, Kirsty J. Pringle, Steven T. Turnock, Jo Browse, et al.From:Atmospheric Chemistry and Physics (Vol. 20, Issue 15) Peer-Reviewed

  Aug. 13, 2020371 words Brief article The effect of observational constraint on the ranges of uncertain physical and chemical process parameters was explored in a global aerosol-climate model. The study uses 1 million variants of the Hadley Centre General...

• Lidar depolarization ratio of atmospheric pollen at multiple wavelengths.

  Authors:Stephanie Bohlmann, Xiaoxia Shang, Ville Vakkari, Elina Giannakaki, Ari Leskinen, Kari E. J. Lehtinen, et al.From:Atmospheric Chemistry and Physics (Vol. 21, Issue 9) Peer-Reviewed

  May 10, 2021303 words Brief article Lidar observations during the pollen season 2019 at the European Aerosol Research Lidar Network (EARLINET) station in Kuopio, Finland, were analyzed in order to optically characterize atmospheric pollen. Pollen...

• Winter atmospheric boundary layer observations over sea ice in the coastal zone of the Bay of Bothnia (Baltic Sea).

  Authors:Marta Wenta, David Brus, Konstantinos Doulgeris, Ville Vakkari, and Agnieszka HermanFrom:Earth System Science Data (Vol. 13, Issue 1) Peer-Reviewed

  Jan. 6, 2021297 words Brief article The Hailuoto Atmospheric Observations over Sea ice (HAOS) campaign took place at the westernmost point of Hailuoto island (Finland) between 27 February and 2 March 2020. The aim of the campaign was to obtain atmospheric...

• Carbon balance of a grazed savanna grassland ecosystem in South Africa

  Authors:Mika Aurela, Ville Vakkari, Johan P. Beukes, Juha-Pekka Tuovinen, Pieter G. Van Zyl, Miroslav Josipovic, et al.From:Biogeosciences (Vol. 14, Issue 5) Peer-Reviewed

  Mar. 7, 2017246 words Brief article Tropical savannas and grasslands are estimated to contribute significantly to the total primary production of all terrestrial vegetation. Large parts of African savannas and grasslands are used for agriculture and...

• Global analysis of continental boundary layer new particle formation based on long-term measurements

  Authors:Tuomo Nieminen, Veli-Matti Kerminen, Tuukka Petaja, Pasi P. Aalto, Mikhail Arshinov, Eija Asmi, et al.From:Atmospheric Chemistry and Physics (Vol. 18, Issue 19) Peer-Reviewed

  Oct. 12, 2018287 words Brief article, Case ...

  Atmospheric new particle formation (NPF) is an important phenomenon in terms of global particle number concentrations. Here we investigated the frequency of NPF, formation rates of 10 nm particles, and growth...