Rapid measurement of RH-dependent aerosol hygroscopic growth using a humidity-controlled fast integrated mobility spectrometer (HFIMS)
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Published:2021-08-18
Issue:8
Volume:14
Page:5625-5635
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ISSN:1867-8548
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Container-title:Atmospheric Measurement Techniques
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language:en
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Short-container-title:Atmos. Meas. Tech.
Author:
Zhang JiaoshiORCID, Spielman Steven, Wang YangORCID, Zheng GuangjieORCID, Gong XiandaORCID, Hering SusanneORCID, Wang JianORCID
Abstract
Abstract. The ability of aerosol particles to uptake water
(hygroscopic growth) is an important determinant of aerosol optical
properties and radiative effects. Aerosol hygroscopic growth is
traditionally measured by humidified tandem differential mobility analyzers
(HTDMA), in which size-selected dry particles are exposed to elevated
relative humidity (RH), and the size distribution of humidified particles
is subsequently measured using a scanning mobility particle sizer. As a
scanning mobility particle sizer can measure only one particle size at a
time, HTDMA measurements are time consuming, and ambient measurements are
often limited to a single RH level. Pinterich et al. (2017b) showed that
fast measurements of aerosol hygroscopic growth are possible using a
humidity-controlled fast integrated mobility spectrometer (HFIMS). In HFIMS,
the size distribution of humidified particles is rapidly captured by a
water-based fast integrated mobility spectrometer (WFIMS), leading to a
factor of ∼10 increase in measurement time resolution. In
this study we present a prototype HFIMS that extends fast hygroscopic growth
measurements to a wide range of atmospherically relevant RH values, allowing
for more comprehensive characterizations of aerosol hygroscopic growth. A
dual-channel humidifier consisting of two humidity conditioners in parallel
is employed such that aerosol RH can be quickly stepped among different RH
levels by sampling from alternating conditioners. The measurement sequence
is also optimized to minimize the transition time between different particle
sizes. The HFIMS is capable of measuring aerosol hygroscopic growth of six
particle diameters under five RH levels ranging from 20 % to 85 % (30
separate measurements) every 25 min. The performance of this HFIMS is
characterized and validated using laboratory-generated ammonium sulfate
aerosol standards. Measurements of ambient aerosols are shown to demonstrate
the capability of HFIMS to capture the rapid evolution of aerosol
hygroscopic growth and its dependence on both size and RH.
Funder
Small Business Innovative Research and Small Business Technology Transfer
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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