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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Volume 10, issue 12 | Copyright
Atmos. Meas. Tech., 10, 4915-4925, 2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 15 Dec 2017

Research article | 15 Dec 2017

A humidity-controlled fast integrated mobility spectrometer (HFIMS) for rapid measurements of particle hygroscopic growth

Tamara Pinterich1, Steven R. Spielman2, Yang Wang1, Susanne V. Hering2, and Jian Wang1 Tamara Pinterich et al.
  • 1Brookhaven National Laboratory, Upton, NY 11973-5000, USA
  • 2Aerosol Dynamics Inc., Berkeley, CA 94710, USA

Abstract. We present a humidity-controlled fast integrated mobility spectrometer (HFIMS) for rapid particle hygroscopicity measurements. The HFIMS consists of a differential mobility analyzer (DMA), a relative humidity (RH) control unit and a water-based FIMS (WFIMS) coupled in series. The WFIMS (Pinterich et al., 2017) combines the fast integrated mobility spectrometer (Kulkarni and Wang, 2006a, b) with laminar flow water condensation methodologies (Hering and Stolzenburg, 2005; Spielman et al., 2017). Inside the WFIMS, particles of different electrical mobilities are spatially separated in an electric field, condensationally enlarged and imaged to provide 1Hz measurements of size distribution spanning a factor of  ∼ 3 in particle diameter, which is sufficient to cover the entire range of growth factor (GF) for atmospheric aerosol particles at 90% RH. By replacing the second DMA of a traditional hygroscopicity tandem DMA (HTDMA) system with the WFIMS, the HFIMS greatly increases the speed of particle growth factor measurement.

The performance of the HFIMS was evaluated using NaCl particles with well-known hygroscopic growth behavior and further through measurements of ambient aerosols. Results show that the HFIMS can reproduce, within 2%, the literature values for hygroscopic growth of NaCl particles. NaCl deliquescence was observed between 76 and 77% RH in agreement with the theoretical value of 76.5% (Ming and Russell, 2001), and efflorescence relative humidity (43%) was found to lie within the RH range of 41 to 56% reported in the literature. Ambient data indicate that the HFIMS can measure the hygroscopic growth of five standard dry particle sizes ranging from 35 to 165nm within less than 3min, which makes it about 1 order of magnitude faster than traditional HTDMA systems.

Publications Copernicus
Short summary
The ability of atmospheric particles to uptake water (particle hygroscopicity) is a key parameter in determining their impact on global climate. We present a humidity-controlled fast integrated mobility spectrometer (HFIMS) for rapid measurement of particle hygroscopicity. The HFIMS' performance evaluation shows that it is about an order of magnitude faster than traditional systems, greatly improving our capability to study particle hygroscopicity especially for rapidly evolving aerosols.
The ability of atmospheric particles to uptake water (particle hygroscopicity) is a key...