R
Runlong Cai
Researcher at University of Helsinki
Publications - 65
Citations - 1078
Runlong Cai is an academic researcher from University of Helsinki. The author has contributed to research in topics: Chemistry & Aerosol. The author has an hindex of 12, co-authored 34 publications receiving 406 citations. Previous affiliations of Runlong Cai include Tsinghua University & Beijing University of Chemical Technology.
Papers
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Journal ArticleDOI
Aerosol surface area concentration: a governing factor in new particle formation in Beijing
Runlong Cai,Dongsen Yang,Yueyun Fu,Xing Wang,Xiaoxiao Li,Yan Ma,Jiming Hao,Jun Zheng,Jingkun Jiang +8 more
TL;DR: In this article, the authors investigated the role of aerosol Fuchs surface area in determining the occurrence of new particle formation (NPF) events in Beijing, using a field campaign from 12 March to 6 April 2016, during which aerosol size distributions down to 1 µnm and sulfuric acid concentrations were simultaneously monitored.
Journal ArticleDOI
Is reducing new particle formation a plausible solution to mitigate particulate air pollution in Beijing and other Chinese megacities
Markku Kulmala,Markku Kulmala,Lubna Dada,Kaspar R. Daellenbach,Chao Yan,Chao Yan,Dominik Stolzenburg,Jenni Kontkanen,Ekaterina Ezhova,Simo Hakala,Saana Tuovinen,Tom V. Kokkonen,Mona Kurppa,Runlong Cai,Ying Zhou,Rujing Yin,Rima Baalbaki,Tommy Chan,Tommy Chan,Biwu Chu,Biwu Chu,Chenjuan Deng,Yueyun Fu,Maofa Ge,Hong He,Liine Heikkinen,Heikki Junninen,Yiliang Liu,Yiqun Lu,Wei Nie,Anton Rusanen,Ville Vakkari,Ville Vakkari,Yonghong Wang,Gan Yang,Lei Yao,Jun Zheng,Joni Kujansuu,Joni Kujansuu,Juha Kangasluoma,Juha Kangasluoma,Tuukka Petäjä,Tuukka Petäjä,Tuukka Petäjä,Pauli Paasonen,Leena Järvi,Douglas R. Worsnop,Aijun Ding,Yongchun Liu,Lin Wang,Jingkun Jiang,F. Bianchi,F. Bianchi,Veli-Matti Kerminen +53 more
TL;DR: It is shown that in practice almost all present-day haze episodes originate from NPF, mainly since the direct emission of primary particles in Beijing has considerably decreased during recent years, and that the number of annual haze days could be approximately halved.
Journal ArticleDOI
Seasonal Characteristics of New Particle Formation and Growth in Urban Beijing
Chenjuan Deng,Yueyun Fu,Lubna Dada,Chao Yan,Chao Yan,Runlong Cai,Dongsen Yang,Ying Zhou,Rujing Yin,Yiqun Lu,Xiaoxiao Li,Xiaohui Qiao,Xiaolong Fan,Wei Nie,Jenni Kontkanen,Juha Kangasluoma,Juha Kangasluoma,Biwu Chu,Biwu Chu,Aijun Ding,Veli-Matti Kerminen,Pauli Paasonen,Douglas R. Worsnop,F. Bianchi,Yongchun Liu,Jun Zheng,Lin Wang,Markku Kulmala,Markku Kulmala,Jingkun Jiang +29 more
TL;DR: It is shown that ambient temperature is a governing factor driving the seasonal variation of J1.5.5 and NPF frequency in urban Beijing, while the condensation sink and the daily maximum H2SO4 concentration show no significant seasonal variation during the NPF periods.
Journal ArticleDOI
Sulfuric acid–amine nucleation in urban Beijing
Runlong Cai,Runlong Cai,Runlong Cai,Chao Yan,Chao Yan,Dongsen Yang,Rujing Yin,Yiqun Lu,Chenjuan Deng,Yueyun Fu,Jiaxin Ruan,Xiaoxiao Li,Jenni Kontkanen,Qiang Zhang,Juha Kangasluoma,Juha Kangasluoma,Yan Ma,Jiming Hao,Douglas R. Worsnop,F. Bianchi,Pauli Paasonen,Veli-Matti Kerminen,Yongchun Liu,Lin Wang,Jun Zheng,Markku Kulmala,Markku Kulmala,Jingkun Jiang +27 more
TL;DR: Based on long-term atmospheric measurements from January-2018 to March-2019 in Beijing, the nucleation mechanism and the influences of H2SO4 concentration, amine concentrations, and aerosol concentration on NPF are quantified in this paper.
Journal ArticleDOI
Overview of measurements and current instrumentation for 1–10 nm aerosol particle number size distributions
Juha Kangasluoma,Juha Kangasluoma,Runlong Cai,Runlong Cai,Jingkun Jiang,Chenjuan Deng,Dominik Stolzenburg,Dominik Stolzenburg,Lauri Ahonen,Tommy Chan,Yueyun Fu,Changhyuk Kim,Changhyuk Kim,Tiia Laurila,Ying Zhou,Lubna Dada,Juha Sulo,Richard C. Flagan,Markku Kulmala,Markku Kulmala,Tuukka Petäjä,Katrianne Lehtipalo,Katrianne Lehtipalo +22 more
TL;DR: In this article, the authors present a comprehensive uncertainty analysis for these methods that suggests that their present understanding on the sources of uncertainties quite well captures the observed deviations between different instruments in the size distribution measurements, and suggest guidelines for selecting suitable instruments for various applications.