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@ARTICLE{Massling:20028,
      author       = {Massling, A. and Niedermeier, N. and Henning, T. and Fors,
                      E.O. and Swietlicki, E. and Ehn, M. and Hämeri, K. and
                      Villani, P. and Laj, P. and Good, N. and McFiggans, G. and
                      Wiedensohler, A.},
      title        = {{R}esults and recommendations from an intercomparison of
                      six {H}ygroscopicity-{TDMA} systems},
      journal      = {Atmospheric measurement techniques},
      volume       = {4},
      issn         = {1867-1381},
      address      = {Katlenburg-Lindau},
      publisher    = {Copernicus},
      reportid     = {PreJuSER-20028},
      pages        = {485 - 497},
      year         = {2011},
      note         = {The H-TDMA calibration and intercomparison workshop held at
                      the WMO-GAW World Calibration Centre for Aerosol Physics,
                      Leipzig, Germany, was supported by the EU-projects ACCENT
                      (GOCE-CT-2004-505337), EUSAAR (RII3-CT-2006-14 026140) and
                      by the German Federal Environment Agency (FKZ: 351 01 046:
                      GAW World Calibration Centre).},
      abstract     = {The performance of six custom-built Hygrocopicity-Tandem
                      Differential Mobility Analyser (H-TDMA) systems was
                      investigated in the frame of an international calibration
                      and intercomparison workshop held in Leipzig, February 2006.
                      The goal of the workshop was to harmonise H-TDMA
                      measurements and develop recommendations for atmospheric
                      measurements and their data evaluation. The H-TDMA systems
                      were compared in terms of the sizing of dry particles,
                      relative humidity (RH) uncertainty, and consistency in
                      determination of number fractions of different hygroscopic
                      particle groups. The experiments were performed in an
                      air-conditioned laboratory using ammonium sulphate particles
                      or an external mixture of ammonium sulphate and soot
                      particles.The sizing of dry particles of the six H-TDMA
                      systems was within 0.2 to $4.2\%$ of the selected particle
                      diameter depending on investigated size and individual
                      system. Measurements of ammonium sulphate aerosol found
                      deviations equivalent to $4.5\%$ RH from the set point of
                      $90\%$ RH compared to results from previous experiments in
                      the literature. Evaluation of the number fraction of
                      particles within the clearly separated growth factor modes
                      of a laboratory generated externally mixed aerosol was done.
                      The data from the H-TDMAs was analysed with a single fitting
                      routine to investigate differences caused by the different
                      data evaluation procedures used for each H-TDMA. The
                      differences between the H-TDMAs were reduced from
                      $+12/-13\%$ to $+8/-6\%$ when the same analysis routine was
                      applied. We conclude that a common data evaluation procedure
                      to determine number fractions of externally mixed aerosols
                      will improve the comparability of H-TDMA measurements.It is
                      recommended to ensure proper calibration of all flow,
                      temperature and RH sensors in the systems. It is most
                      important to thermally insulate the aerosol humidification
                      unit and the second DMA and to monitor these temperatures to
                      an accuracy of 0.2 degrees C. For the correct determination
                      of external mixtures, it is necessary to take into account
                      size-dependent losses due to diffusion in the plumbing
                      between the DMAs and in the aerosol humidification unit.},
      keywords     = {J (WoSType)},
      cin          = {IEK-8},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {Atmosphäre und Klima},
      pid          = {G:(DE-Juel1)FUEK491},
      shelfmark    = {Meteorology $\&$ Atmospheric Sciences},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000288911000007},
      doi          = {10.5194/amt-4-485-2011},
      url          = {https://juser.fz-juelich.de/record/20028},
}