Group members

Group Leader

          Dr. Yafang Cheng

          Aerosols are at the center of my research interests. I am
          developing and combining experimental methods and
          multi-scale modeling tools to elucidate the mechanisms
          of aerosol particle formation and transformation as well
          as the impact of aerosols on air quality, public health,
          and climate change.



Technical staff

          Dr. Uwe Kuhn

          Sources, atmospheric transformation and sinks of climatically
          relevant trace gases of the earth’s atmosphere is focus of my


                                                                                                 Dr. Thomas Klimach



Ph.D. Students

          Xihao Pan

          My research focuses on the effects of black carbon on the
          climate at high altitude. I am responsible for the data handling
          of CARIBIC-SP2, which measures the physicochemical
          properties of individual BC particles in the upper troposphere
          and lowermost stratosphere.          


          Jianqiang Zhu

          My research focuses on the aerosol particle size distribution in
          different regions, including China, Europe, and Amazon forests.
          Using different state-of-the-art particle measurement
          instruments (Nano-SPMS, NAIS, and PSM), we want to
          understand how particles form and further growth in the
          atmosphere. Meanwhile, I am also working on the
          Nano-HTDMA (Hygroscopic Tandem Differential
         Mobility Analyzer) to investigate the hygroscopicity of organic
         Nano-particles and the size effect.


          Matteo Krüger

          My research addresses the health effects of exposure to
          particulate matter with an emphasis on smoking and
          passive smoking using kinetic modeling. Also, I explore
          different applications of machine learning in atmospheric


          Bruno Backes Meller

          My research aims at understanding the sources and life cycle of
          aerosols in the Amazon atmosphere, particularly the physical
          and chemical mechanisms of secondary formation. To this end,
          I work on Amazon field campaigns to measure aerosol, gas
          and cluster chemical composition using mass spectrometry.

          Bruno is a visiting student from the Institute of Physics -
          University of Sao Paulo, Brazil.


          Qinqin Yu

          My research focuses on aerosol formation and environmental &
          climate impact in low temperature environment, e.g., her field
          observations were mainly conducted in cold winter in Harbin
          city in northern China.


          Yunzhi Xu

          My research focuses on the analysis of air pollution
          characteristics in Northern China, in particular the
          formation of Hydroxymethanesulfonate (HMS)
          in PM2.5.


                                                                                                 Elizabeth Rigby

                                                                                                 I study physicochemical properties of aerosol   
                                                                                                    particles using optical tweezers.

                                                                                                    Elizabeth is a visiting studeng from Oberlin College,
                                                                                                    Oberlin, OH, USA.


Postdoctoral Researchers

          Dr. Guangjie Zheng

          My research focuses on the formation and transformation
          mechanisms of atmospheric aerosol particles, in particular
          thermodynamics and aerosol acidity.         


          Dr. Guo Li

           My current research topics are mainly related to development
           of techniques to directly probe the  acidity (pH) of ambient
           aerosols and participating field campaigns to explore aerosol
           composition and growth characteristics under varied
           environmental conditions.


          Dr. Chaoqun Ma

          I mainly work with regional and global atmospheric chemistry
          models as well as Data Assimilation and Deep Learning
          technologies. With these tools, I investigate different processes
          about atmospheric chemistry and their interaction with the
          earth system.


          Dr. Ruijing Ni

          My research focuses on the impact of air pollution exposure on
          public health. By combining the epidemiological data and
          modeling simulations, I investigate the global burden of disease
          attributable to air pollution exposure (especially the particulate
          matter exposure).


          Dr. Jiani Tan

          My research focuses on the issues related to the atmospheric
          deposition of reactive nitrogen and its impact on air quality
          and climate change by applying machine learning techniques.


          Dr. Wen-Chien Lee

          I study physicochemical properties of aerosol particles using
          optical tweezers.


          Dr. Fengxia Bao

          I study the mechanisms of HONO production from soils using
          laboratory smog chambers combined with long-path absorption
          photometric (LPAP) HONO measurement systems.


          Dr. Wenjie Wang

          My research focuses on ozone pollution issues and coupling
          effects between ozone and particulate matter in the
          atmosphere by applying measurement data and model


          Dr. Siyao Yue

          I study the roles of biological aerosols (bioaerosols) in the
          atmosphere and the Earth system. I also develop
          techniques to measure bioaerosols (e.g., WIBS; fluorescence)
          and programming tools for the post-analysis of the collected
          data. Besides, I study the chemistry of brown carbon and their
          impact on the climate, e.g., the Arctic warming.


          Dr. Lianfang Wei

          I am working on incorporating the isotopic chemistry tagging
          technique into atmospheric chemical model to make an
          improved simulation of secondary inorganic aerosol
          (sulfate, nitrate, and ammonium), and further get a new
          approach to constrain their formation processes and sources.


          Dr. Wenjun Meng

          My research focuses on investigating the co-benefits
          between air pollution control and climate change mitigation. 





Stefan Nordmann (postdoc, 2012-2015; now: research scientist at UBA)
Jeanine Ditas (postdoc, 2014-2019)
Zhibin Wang (project leader, co-advised postdoc, 2013-2017; now: professor at Zhejiang University)
Meng Li (co-advised postdoc, 2016-2019; now: research scientist at NCAR, USA)
Nan Ma (project leader, postdoc, 2016-2018; now: professor at Jinan University)
Jiandong Wang (postdoc, 2016-2019; now: professor at Nanjing University of Information Science & Technology)
Yuxuan Zhang (postdoc, 2017-2020; now: assistant professor at Nanjing University)
Guangjie Zheng (project leader, postdoc, haze formation, 2019-2022; now: assistant professor at Tsinghua University)
Siwen Wang (project leader, postdoc, air pollution and control policy, 2014-12.2022)
Najin Kim (co-advised postdoc, BS2-CCN, 2019-2022; now: )
Wei Tao (postdoc, WRF-Chem modeling, 2018-2022)
Lixia Liu (postdoc, WRF-Chem modeling, 2021-2022)
Meng Li (postdoc, AOT single particle analyses, 2019-2022; now: postdoc at UCSD, USA)
Man Yu (co-advised postdoc, air pollution and urbanlization, 2018-, supported by Jinan University)
Qihou Hu (visiting scientist, supported by CSC, 2016-2017, now: USTC)
Yunping Lin (visiting scientist, supported by CSC, 2017-2018, now: )
Pusheng Zhao (visiting scientist, supported by CSC, 2017-2018 now: )
Qian Liu (visiting scientist, supported by CSC, 2017-2018, now: )
Qiaoqiao Wang (visiting scientist, 2017-2018, now: professor at Jinan University)
Pingqing Fu (visiting scientist, 2019. Professor at Tianjing University) 

Hannah Meusel (PhD, graduated in 2017)
Qing Mu (co-advised PhD, graduated in 2018; now: tenured research scientist at Norwegian Meteorological Institute)
Minghui Zhang (co-advised PhD, graducated in 2019)
Xin Wang (co-advised PhD, graducated in 2020)
Lixia Liu (PhD, graduated in 2021)
Ting Lei (co-advised PhD, graduated in 2021)
Guo Li (PhD, graduated in 2018; funded by CSC)
Xiaoxiang Wang (PhD, graduated in 2019; funded by CSC)
Chuchu Chen (PhD, graduated in 2022)
Ying Chen (co-advised PhD, graduated in 2017; funded by TROPOS, Leipzig; now: research scientist at PSI)
Guangjie Zheng (co-advised PhD, graduated in 2016; funded by CSC, 2014-2015)
Yuxuan Zhang (co-advised PhD, graduated in 2017; funded by CSC, 2015-2016)
Ke Ding (co-advised PhD, graduated in 2019; funded by CSC, 2018; now: assistant professor at Nanjing University)
Jiaping Wang (co-advised PhD, graduated in 2019; funded by CSC, 2019; now: assistant professor at Nanjing University)
Yan Xiang (visiting PhD student; funded by CSC, 2016-2017)


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