% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@ARTICLE{Wiedensohler:2084,
      author       = {Wiedensohler, A. and Cheng, Y.F. and Nowak, A. and Wehner,
                      B. and Achtert, P. and Berghof, M. and Birmili, Z. and Wu,
                      J. and Hu, M. and Zhu, T. and Takegawa, N. and Kita, K. and
                      Kondo, Y. and Lou, S.R. and Hofzumahaus, A. and Holland, F.
                      and Wahner, A. and Gunthe, S.S. and Rose, D. and Su, H. and
                      Pöschl, U.},
      title        = {{R}apid aerosol particle growth and increase of cloud
                      condensation nucleus activity by secondary aerosol formation
                      and condensation: {A} case study for regional air pollution
                      in northeastern {C}hina},
      journal      = {Journal of Geophysical Research},
      volume       = {114},
      issn         = {0148-0227},
      address      = {Washington, DC},
      publisher    = {Union},
      reportid     = {PreJuSER-2084},
      pages        = {1 - 13},
      year         = {2009},
      note         = {This work as part of CAREBeijing-2006 (Campaigns of Air
                      Quality Research in Beijing 2006) were mainly supported by
                      Beijing Council of Science and Technology (HB200504-6 and
                      HB200504-2). The authors wish to extend their gratitude to
                      all participants for their good humor, enthusiasm, and
                      openness to collaboration in the field measurements at the
                      Yufa site and in the data evaluation. S. S. G., D. R., H.
                      S., and U. P. thank M.O. Andreae and the Max Planck Society
                      for support.},
      abstract     = {This study was part of the international field measurement
                      Campaigns of Air Quality Research in Beijing and Surrounding
                      Region 2006 (CAREBeijing-2006). We investigated a new
                      particle formation event in a highly polluted air mass at a
                      regional site south of the megacity Beijing and its impact
                      on the abundance and properties of cloud condensation nuclei
                      (CCN). During the 1-month observation, particle nucleation
                      followed by significant particle growth on a regional scale
                      was observed frequently (similar to $30\%),$ and we chose 23
                      August 2006 as a representative case study. Secondary
                      aerosol mass was produced continuously, with sulfate,
                      ammonium, and organics as major components. The aerosol mass
                      growth rate was on average 19 mu g m(-3) h(-1) during the
                      late hours of the day. This growth rate was observed several
                      times during the 1-month intensive measurements. The
                      nucleation mode grew very quickly into the size range of
                      CCN, and the CCN size distribution was dominated by the
                      growing nucleation mode ( up to $80\%$ of the total CCN
                      number concentration) and not as usual by the accumulation
                      mode. At water vapor supersaturations of $0.07-0.86\%,$ the
                      CCN number concentrations reached maximum values of
                      4000-19,000 cm(-3) only 6-14 h after the nucleation event.
                      During particle formation and growth, the effective
                      hygroscopicity parameter kappa increased from about 0.1-0.3
                      to 0.35-0.5 for particles with diameters of 40-90 nm, but it
                      remained nearly constant at similar to 0.45 for particles
                      with diameters of similar to 190 nm. This result is
                      consistent with aerosol chemical composition data, showing a
                      pronounced increase of sulfate.},
      keywords     = {J (WoSType)},
      cin          = {ICG-2},
      ddc          = {550},
      cid          = {I:(DE-Juel1)VDB791},
      pnm          = {Atmosphäre und Klima},
      pid          = {G:(DE-Juel1)FUEK406},
      shelfmark    = {Meteorology $\&$ Atmospheric Sciences},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000265667200005},
      doi          = {10.1029/2008JD010884},
      url          = {https://juser.fz-juelich.de/record/2084},
}