Results 11 to 20 of about 18,582,204 (254)

The development of a laboratory system to investigate the interactions of tropospheric aerosol and HOx radicals [PDF]

, 2011
This thesis describes the development and application of a laboratory system to investigate the loss of peroxy radicals to aerosol. The laboratory system consisted of an aerosol flow tube coupled to a custom-built PEroxy Radical Chemical Amplifier (PERCA).
Faloon, Kathleen Helen
core   +7 more sources

Formation of nighttime sulfuric acid from the ozonolysis of alkenes in Beijing [PDF]

Atmospheric Chemistry and Physics, 2021
Gaseous sulfuric acid (SA) has received a lot of attention for its crucial role in atmospheric new particle formation (NPF). And for this reason, studies until now have mainly focused on daytime SA when most NPF events occur.
Y. Guo, C. Yan, C. Yan, C. Li, W. Ma, Z. Feng, Y. Zhou, Z. Lin, L. Dada, D. Stolzenburg, R. Yin, J. Kontkanen, K. R. Daellenbach, J. Kangasluoma, J. Kangasluoma, L. Yao, B. Chu, Y. Wang, R. Cai, F. Bianchi, Y. Liu, M. Kulmala, M. Kulmala   +22 more
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Measurement report: The influence of traffic and new particle formation on the size distribution of 1–800 nm particles in Helsinki – a street canyon and an urban background station comparison [PDF]

Atmospheric Chemistry and Physics, 2021
Most of the anthropogenic air pollution sources are located in urban environments. The contribution of these sources to the population of atmospheric particles in the urban environment is poorly known.
M. Okuljar, H. Kuuluvainen, J. Kontkanen, O. Garmash, M. Olin, J. V. Niemi, H. Timonen, J. Kangasluoma, Y. J. Tham, R. Baalbaki, M. Sipilä, L. Salo, H. Lintusaari, H. Portin, K. Teinilä, M. Aurela, M. Dal Maso, T. Rönkkö, T. Petäjä, P. Paasonen   +19 more
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Measurement report: A multi-year study on the impacts of Chinese New Year celebrations on air quality in Beijing, China [PDF]

Atmospheric Chemistry and Physics, 2022
This study investigates the influence of the Chinese New Year (CNY) celebrations on local air quality in Beijing from 2013 through 2019. CNY celebrations include burning of fireworks and firecrackers, which consequently has a significant short-term ...
B. Foreback, B. Foreback, L. Dada, K. R. Daellenbach, C. Yan, C. Yan, L. Wang, B. Chu, B. Chu, Y. Zhou, T. V. Kokkonen, T. V. Kokkonen, M. Kurppa, R. E. Pileci, Y. Wang, T. Chan, J. Kangasluoma, J. Kangasluoma, L. Zhuohui, Y. Guo, C. Li, R. Baalbaki, J. Kujansuu, J. Kujansuu, X. Fan, Z. Feng, P. Rantala, S. Gani, F. Bianchi, F. Bianchi, V.-M. Kerminen, T. Petäjä, T. Petäjä, T. Petäjä, M. Kulmala, M. Kulmala, M. Kulmala, Y. Liu, P. Paasonen   +38 more
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Rapid mass growth and enhanced light extinction of atmospheric aerosols during the heating season haze episodes in Beijing revealed by aerosol–chemistry–radiation–boundary layer interaction [PDF]

Atmospheric Chemistry and Physics, 2021
Despite the numerous studies investigating haze formation mechanism in China, it is still puzzling that intensive haze episodes could form within hours directly following relatively clean periods.
Z. Lin, Y. Wang, Y. Wang, F. Zheng, Y. Zhou, Y. Guo, Z. Feng, C. Li, Y. Zhang, S. Hakala, T. Chan, C. Yan, K. R. Daellenbach, B. Chu, L. Dada, J. Kangasluoma, J. Kangasluoma, L. Yao, X. Fan, W. Du, J. Cai, R. Cai, T. V. Kokkonen, T. V. Kokkonen, P. Zhou, L. Wang, T. Petäjä, T. Petäjä, F. Bianchi, F. Bianchi, V.-M. Kerminen, V.-M. Kerminen, Y. Liu, M. Kulmala, M. Kulmala, M. Kulmala   +35 more
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Influence of anthropogenic emissions on the composition of highly oxygenated organic molecules in Helsinki: a street canyon and urban background station comparison [PDF]

Atmospheric Chemistry and Physics, 2023
Condensable vapors, including highly oxygenated organic molecules (HOMs), govern secondary organic aerosol formation and thereby impact the quantity, composition, and properties (e.g., toxicity) of aerosol particles. These vapors are mainly formed in the
M. Okuljar, O. Garmash, O. Garmash, M. Olin, J. Kalliokoski, H. Timonen, J. V. Niemi, P. Paasonen, J. Kontkanen, J. Kontkanen, Y. Zhang, Y. Zhang, H. Hellén, H. Kuuluvainen, M. Aurela, H. E. Manninen, M. Sipilä, T. Rönkkö, T. Petäjä, M. Kulmala, M. Dal Maso, M. Ehn   +21 more
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Counting on chemistry: laboratory evaluation of seed-material-dependent detection efficiencies of ultrafine condensation particle counters [PDF]

Atmospheric Measurement Techniques, 2020
Condensation particle counters (CPCs) are crucial instruments for detecting sub-10 nm aerosol particles. Understanding the detection performance of a CPC requires thorough characterization under well-controlled laboratory conditions.
P. J. Wlasits, D. Stolzenburg, D. Stolzenburg, C. Tauber, S. Brilke, S. H. Schmitt, P. M. Winkler, D. Wimmer   +7 more
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Measurement report: Atmospheric new particle formation in a coastal agricultural site explained with binPMF analysis of nitrate CI-APi-TOF spectra [PDF]

Atmospheric Chemistry and Physics, 2022
The occurrence of new particle formation (NPF) events detected in a coastal agricultural site, at Qvidja, in Southwestern Finland, was investigated using the data measured with a nitrate ion-based chemical-ionization atmospheric-pressure-interface time ...
M. Olin, M. Okuljar, M. P. Rissanen, J. Kalliokoski, J. Shen, L. Dada, L. Dada, M. Lampimäki, Y. Wu, A. Lohila, A. Lohila, J. Duplissy, J. Duplissy, M. Sipilä, T. Petäjä, M. Kulmala, M. Kulmala, M. Kulmala, M. Dal Maso   +18 more
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Effect of fluctuating aerosol concentrations on the aerosol distributions in a turbulent jet [PDF]

, 2021
11th Asian Aerosol Conference (AAC), May 27-30, 2019, City Univ Hong Kong, Kowloon, Hong Kong202101 bcrcVersion of ...
Yang, HL, Chan, TT, Lin, JZ
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Size-segregated particle number and mass concentrations from different emission sources in urban Beijing [PDF]

Atmospheric Chemistry and Physics, 2020
Although secondary particulate matter is reported to be the main contributor of PM2.5 during haze in Chinese megacities, primary particle emissions also affect particle concentrations.
J. Cai, J. Cai, B. Chu, B. Chu, B. Chu, B. Chu, L. Yao, C. Yan, C. Yan, L. M. Heikkinen, L. M. Heikkinen, F. Zheng, C. Li, X. Fan, S. Zhang, D. Yang, Y. Wang, T. V. Kokkonen, T. V. Kokkonen, T. Chan, T. Chan, Y. Zhou, L. Dada, L. Dada, Y. Liu, H. He, H. He, P. Paasonen, P. Paasonen, J. T. Kujansuu, J. T. Kujansuu, T. Petäjä, T. Petäjä, C. Mohr, J. Kangasluoma, J. Kangasluoma, F. Bianchi, F. Bianchi, Y. Sun, P. L. Croteau, D. R. Worsnop, D. R. Worsnop, V.-M. Kerminen, V.-M. Kerminen, W. Du, W. Du, M. Kulmala, M. Kulmala, K. R. Daellenbach, K. R. Daellenbach   +49 more
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