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https://doi.org/10.5194/amt-2017-180
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
26 Jun 2017
Review status
This discussion paper is a preprint. A revision of the manuscript is under review for the journal Atmospheric Measurement Techniques (AMT).
A Humidity-controlled Fast Integrated Mobility Spectrometer (HFIMS) for rapid measurements of particle hygroscopic growth
Tamara Pinterich1, Steven R. Spielman2, Susanne Hering2, and Jian Wang1 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 1-Hz measurements of size distribution spanning a factor of ~ 3 in particle diameter, sufficient to cover the entire range of growth factor 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 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 HFIMS can measure the hygroscopic growth of five standard dry particle sizes ranging from 35 to 165 nm within less than three minutes, which makes it about an order of magnitude faster than traditional HTDMA systems.


Citation: Pinterich, T., Spielman, S. R., Hering, S., and Wang, J.: A Humidity-controlled Fast Integrated Mobility Spectrometer (HFIMS) for rapid measurements of particle hygroscopic growth, Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2017-180, in review, 2017.
Tamara Pinterich et al.
Tamara Pinterich et al.
Tamara Pinterich et al.

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Short summary
The ability of atmospheric particles to uptake water, aka 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. 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, aka particle hygroscopicity, is a key...
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