Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 1 2009 10.5194/acpd-9-4653-2009 http://www.atmos-chem-phys-discuss.net/9/4653/2009/ http://www.atmos-chem-phys-discuss.net/9/4653/2009/acpd-9-4653-2009.html http://www.atmos-chem-phys-discuss.net/9/4653/2009/acpd-9-4653-2009.pdf 4653 4689 2009-02-24 Measurements of particle masses of inorganic salt particles for calibration of cloud condensation nuclei counters M. Kuwata kuwata@atmos.rcast.u-tokyo.ac.jp Y. Kondo Research Center for Advanced Science and Technology, the University of Tokyo, Tokyo, Japan We measured the mobility equivalent critical dry diameter for CCN activation (<i>d_{c_me}</i>) and the particle mass of size-selected (NH₄)₂SO₄ and NaCl particles to calibrate a CCN counter (CCNC) precisely. The CCNC was operated downstream of a differential mobility analyzer (DMA) for the measurement of <i>d_{c_me}</i>. The particle mass was measured using an aerosol particle mass analyzer (APM) operated downstream of the DMA. The measurement of particle mass was conducted for 50–150-nm particles. Effective densities (&rho;_eff) of (NH₄)₂SO₄ particles were 1.67–1.75 g cm^&minus;3, which correspond to the dynamic shape factors (χ) of 1.01–1.04. This shows that (NH₄)₂SO₄ particles are not completely spherical. In the case of NaCl particles, &rho;_eff was 1.75–1.99 g cm^&minus;3 and χ was 1.05–1.14, demonstrating that their particle shape was non-spherical. Using these experimental data, the volume equivalent critical dry diameter (<i>d_{c_ve}</i>) was calculated, and it was used as an input parameter for calculations of critical supersaturation (<i>S</i>). Several thermodynamics models were used for the calculation of water activity. When the Pitzer model was employed for the calculations, the critical <i>S</i> calculated for (NH₄)₂SO₄ and NaCl agreed to well within the uncertainty of 2% (relative). 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