Rapid measurement of RH-dependent aerosol hygroscopic growth using a humidity-controlled fast integrated mobility spectrometer (HFIMS)
<p>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 dr...
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doaj-9e881acdfe724f16b0cc65d29a44218f2021-08-18T06:13:17ZengCopernicus PublicationsAtmospheric Measurement Techniques1867-13811867-85482021-08-01145625563510.5194/amt-14-5625-2021Rapid measurement of RH-dependent aerosol hygroscopic growth using a humidity-controlled fast integrated mobility spectrometer (HFIMS)J. Zhang0S. Spielman1Y. Wang2Y. Wang3G. Zheng4X. Gong5S. Hering6J. Wang7Center for Aerosol Science and Engineering, Washington University in St. Louis, St. Louis, Missouri, USAAerosol Dynamics Inc, Berkeley, California, USACenter for Aerosol Science and Engineering, Washington University in St. Louis, St. Louis, Missouri, USADepartment of Civil, Architectural and Environmental Engineering, Missouri University of Science and Technology, Rolla, Missouri, USACenter for Aerosol Science and Engineering, Washington University in St. Louis, St. Louis, Missouri, USACenter for Aerosol Science and Engineering, Washington University in St. Louis, St. Louis, Missouri, USAAerosol Dynamics Inc, Berkeley, California, USACenter for Aerosol Science and Engineering, Washington University in St. Louis, St. Louis, Missouri, USA<p>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 <span class="inline-formula">∼10</span> 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.</p>https://amt.copernicus.org/articles/14/5625/2021/amt-14-5625-2021.pdf |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
J. Zhang S. Spielman Y. Wang Y. Wang G. Zheng X. Gong S. Hering J. Wang |
spellingShingle |
J. Zhang S. Spielman Y. Wang Y. Wang G. Zheng X. Gong S. Hering J. Wang Rapid measurement of RH-dependent aerosol hygroscopic growth using a humidity-controlled fast integrated mobility spectrometer (HFIMS) Atmospheric Measurement Techniques |
author_facet |
J. Zhang S. Spielman Y. Wang Y. Wang G. Zheng X. Gong S. Hering J. Wang |
author_sort |
J. Zhang |
title |
Rapid measurement of RH-dependent aerosol hygroscopic growth using a humidity-controlled fast integrated mobility spectrometer (HFIMS) |
title_short |
Rapid measurement of RH-dependent aerosol hygroscopic growth using a humidity-controlled fast integrated mobility spectrometer (HFIMS) |
title_full |
Rapid measurement of RH-dependent aerosol hygroscopic growth using a humidity-controlled fast integrated mobility spectrometer (HFIMS) |
title_fullStr |
Rapid measurement of RH-dependent aerosol hygroscopic growth using a humidity-controlled fast integrated mobility spectrometer (HFIMS) |
title_full_unstemmed |
Rapid measurement of RH-dependent aerosol hygroscopic growth using a humidity-controlled fast integrated mobility spectrometer (HFIMS) |
title_sort |
rapid measurement of rh-dependent aerosol hygroscopic growth using a humidity-controlled fast integrated mobility spectrometer (hfims) |
publisher |
Copernicus Publications |
series |
Atmospheric Measurement Techniques |
issn |
1867-1381 1867-8548 |
publishDate |
2021-08-01 |
description |
<p>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 <span class="inline-formula">∼10</span> 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.</p> |
url |
https://amt.copernicus.org/articles/14/5625/2021/amt-14-5625-2021.pdf |
work_keys_str_mv |
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