Hygroscopic Tandem DMA

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The HH-TDMA (High Humidity Hygroscopic Tandem Differential Analyser) is a unique instrument, which accomplishes a controlled humidification of aerosol particles up to 99 % relative humidity (Hennig et al., 2005).

The picture illustrates hygroscopic particle growth in the HH-TDMA at relative humidities between 90-95 %. These measurements originate from the PEGASOS 2012 field experiment in San Pietro Capofiume (Italy).


  • Estimation of the radiative properties of atmospheric aerosols at ambient relative humidity
  • Quantitative separation of externally mixed particle types (more or less hygroscopic particles)
  • Estimation of the ability of particles to act as cloud condensation nuclei (CCN) at given supersaturations


  • Henning, T., A. Massling, F. J. Brechtel, A. Wiedensohler (2005). A Tandem DMA for highly temperature-stabilized hygroscopic particle growth measurements between 90% and 98% relative humidity. J. Aerosol Sci., 36, 1210-1223.
  • Poulain, L. , Z. Wu, M. D. Petters, H. Wex, E. Hallbauer, B. Wehner, A. Massling, S. M. Kreidenweis, F. Stratmann (2010). Towards closing the gap between hygroscopic growth and CCN activation for secondary organic aerosols - Part 3: Influence of the chemical composition on the hygroscopic properties and volatile fractions of aerosols. Atmos. Chem. Phys., 10, 3775-3785.
  • Liu, P. F., C. S. Zhao, T. Göbel, E. Hallbauer, A. Nowak, L. Ran, W. Y. Xu, Z. Z. Deng, N. Ma, K. Mildenberger, S. Henning, F. Stratmann, A. Wiedensohler (2011). Hygroscopic properties of aerosol particles at high relative humidity and their diurnal variations in the North China Plain. Atmos. Chem. Phys., 11, 3479-3494.
  • Chen, J., Zhao, C. S., Ma, N., Liu, P. F., Göbel, T., Hallbauer, E., Deng, Z. Z., Ran, L., Xu, W. Y., Liang, Z., Liu, H. J., Yan, P., Zhou, X. J., and Wiedensohler, A. (2012). A parameterization of low visibilities for hazy days in the North China Plain, Atmos. Chem. Phys., 12, 4935-4950.


Ein bisher einzigartiges Instrument ist das HH-TDMA (High Humidity Hygroscopic Tandem Differential Analyser), welches eine Befeuchtung der Partikel im Instrument bis zu 99 % relativer Feuchte herstellt.

Das Beispielbild zeigt hygroskopisches Partikelwachstum im Bereich relativer Feuchten 90-95 %. Diese HH-TDMA-Messungen stammen aus dem Feldexperiment PEGASOS 2012 in San Pietro Capofiume (Italien).


  • Prognose der Strahlungseigenschaften eines atmosphärischen Aerosols bei Umgebungsfeuchte
  • Quantitative Trennung extern gemischter Partikelpopulation (hydrophil und hydrophob)
  • Vorhersage der Wolkenaktivierungsfähigkeit von Partikeln bei gegebenen Übersättigungen
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