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@ARTICLE{Zhao:278670,
      author       = {Zhao, Defeng and Buchholz, A. and Kortner, B. and Schlag,
                      Patrick and Rubach, Florian and Fuchs, Hendrik and
                      Kiendler-Scharr, A. and Tillmann, R. and Wahner, A. and
                      Watne, Å. K. and Hallquist, M. and Flores, J. M. and
                      Rudich, Y. and Kristensen, K. and Hansen, A. M. K. and
                      Glasius, M. and Kourtchev, I. and Kalberer, M. and Mentel,
                      Th. F.},
      title        = {{C}loud condensation nuclei activity, droplet growth
                      kinetics and hygroscopicity of biogenic and anthropogenic
                      {S}econdary {O}rganic {A}erosol ({SOA})},
      journal      = {Atmospheric chemistry and physics / Discussions},
      volume       = {15},
      number       = {14},
      issn         = {1680-7375},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2015-06995},
      pages        = {19903 - 19945},
      year         = {2015},
      abstract     = {Interaction of biogenic volatile organic compounds (VOC)
                      with anthropogenic VOC affects the physicochemical
                      properties of secondary organic aerosol (SOA). We
                      investigated cloud droplet activation (CCN activity),
                      droplet growth kinetics, and hygroscopicity of mixed
                      anthropogenic and biogenic SOA (ABSOA) compared to pure
                      biogenic SOA (BSOA) and pure anthropogenic SOA (ASOA).
                      Selected monoterpenes and aromatics were used as
                      representative precursors of BSOA and ASOA, respectively.We
                      found that BSOA, ASOA, and ABSOA had similar CCN activity
                      despite the higher oxygen to carbon ratio (O/C) of ASOA
                      compared to BSOA and ABSOA. For individual reaction systems,
                      CCN activity increased with the degree of oxidation. Yet,
                      when considering all different types of SOA together, the
                      hygroscopicity parameter, κCCN, did not correlate with O/C.
                      Droplet growth kinetics of BSOA, ASOA, and ABSOA was
                      comparable to that of (NH4)2SO4, which indicates that there
                      was no delay in the water uptake for these SOA in
                      supersaturated conditions.In contrast to CCN activity, the
                      hygroscopicity parameter from hygroscopic tandem
                      differential mobility analyzer (HTDMA) measurement, κHTDMA,
                      of ASOA was distinctively higher (0.09–0.10) than that of
                      BSOA (0.03–0.06), which was attributed to the higher
                      degree of oxidation of ASOA. The ASOA components in mixed
                      ABSOA enhanced aerosol hygroscopicity. Changing the ASOA
                      fraction by adding BVOC to ASOA or vice versa AVOC to BSOA
                      changed the hygroscopicity of aerosol, in line with the
                      change in the degree of oxidation of aerosol. However, the
                      hygroscopicity of ABSOA cannot be described by a simple
                      linear combination of pure BSOA and ASOA systems. This
                      indicates that additional processes, possibly
                      oligomerization, affected the hygroscopicity.Closure
                      analysis of CCN and HTDMA data showed κHTDMA was lower than
                      κCCN by 30–70 $\%.$ Better closure was achieved for ASOA
                      compared to BSOA. This discrepancy can be attributed to
                      several reasons. ASOA seemed to have higher solubility in
                      subsaturated conditions and/or higher surface tension at the
                      activation point than that of BSOA.},
      cin          = {IEK-8},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {243 - Tropospheric trace substances and their
                      transformation processes (POF3-243)},
      pid          = {G:(DE-HGF)POF3-243},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.5194/acpd-15-19903-2015},
      url          = {https://juser.fz-juelich.de/record/278670},
}