Water uptake of subpollen aerosol particles: hygroscopic growth, cloud condensation nuclei activation, and liquid–liquid phase separation
<p>Pollen grains emitted from vegetation can release subpollen particles (SPPs) that contribute to the fine fraction of atmospheric aerosols and may act as cloud condensation nuclei (CCN), ice nuclei (IN), or aeroallergens. Here, we investigate and characterize the hygroscopic growth and CCN a...
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doaj-f91995c3ceaa42cf9563e91a1c7912ae2021-05-07T06:14:22ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242021-05-01216999702210.5194/acp-21-6999-2021Water uptake of subpollen aerosol particles: hygroscopic growth, cloud condensation nuclei activation, and liquid–liquid phase separationE. F. Mikhailov0E. F. Mikhailov1M. L. Pöhlker2K. Reinmuth-Selzle3S. S. Vlasenko4O. O. Krüger5J. Fröhlich-Nowoisky6C. Pöhlker7O. A. Ivanova8A. A. Kiselev9L. A. Kremper10U. Pöschl11Multiphase Chemistry and Biogeochemistry Departments, Max Planck Institute for Chemistry, 55020 Mainz, GermanyDepartment of Atmospheric Physics, Saint Petersburg State University, 7/9 Universitetskaya nab., St Petersburg, 199034, RussiaMultiphase Chemistry and Biogeochemistry Departments, Max Planck Institute for Chemistry, 55020 Mainz, GermanyMultiphase Chemistry and Biogeochemistry Departments, Max Planck Institute for Chemistry, 55020 Mainz, GermanyDepartment of Atmospheric Physics, Saint Petersburg State University, 7/9 Universitetskaya nab., St Petersburg, 199034, RussiaMultiphase Chemistry and Biogeochemistry Departments, Max Planck Institute for Chemistry, 55020 Mainz, GermanyMultiphase Chemistry and Biogeochemistry Departments, Max Planck Institute for Chemistry, 55020 Mainz, GermanyMultiphase Chemistry and Biogeochemistry Departments, Max Planck Institute for Chemistry, 55020 Mainz, GermanyDepartment of Atmospheric Physics, Saint Petersburg State University, 7/9 Universitetskaya nab., St Petersburg, 199034, RussiaAtmospheric Aerosol Research Department, Institute for Meteorology and Climate Research, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen, GermanyMultiphase Chemistry and Biogeochemistry Departments, Max Planck Institute for Chemistry, 55020 Mainz, GermanyMultiphase Chemistry and Biogeochemistry Departments, Max Planck Institute for Chemistry, 55020 Mainz, Germany<p>Pollen grains emitted from vegetation can release subpollen particles (SPPs) that contribute to the fine fraction of atmospheric aerosols and may act as cloud condensation nuclei (CCN), ice nuclei (IN), or aeroallergens. Here, we investigate and characterize the hygroscopic growth and CCN activation of birch, pine, and rapeseed SPPs. A high-humidity tandem differential mobility analyzer (HHTDMA) was used to measure particle restructuring and water uptake over a wide range of relative humidity (RH) from 2 % to 99.5 %, and a continuous flow CCN counter was used for size-resolved measurements of CCN activation at supersaturations (<span class="inline-formula"><i>S</i></span>) in the range of 0.2 % to 1.2 %. For both subsaturated and supersaturated conditions, effective hygroscopicity parameters, <span class="inline-formula"><i>κ</i></span>, were obtained by Köhler model calculations. Gravimetric and chemical analyses, electron microscopy, and dynamic light scattering measurements were performed to characterize further properties of SPPs from aqueous pollen extracts such as chemical composition (starch, proteins, DNA, and inorganic ions) and the hydrodynamic size distribution of water-insoluble material. All investigated SPP samples exhibited a sharp increase of water uptake and <span class="inline-formula"><i>κ</i></span> above <span class="inline-formula">∼95</span> % RH, suggesting a liquid–liquid phase separation (LLPS). The HHTDMA measurements at RH <span class="inline-formula">>95</span> % enable closure between the CCN activation at water vapor supersaturation and hygroscopic growth at subsaturated conditions, which is often not achieved when hygroscopicity tandem differential mobility analyzer (HTDMA) measurements are performed at lower RH where the water uptake and effective hygroscopicity may be limited by the effects of LLPS. Such effects may be important not only for closure between hygroscopic growth and CCN activation but also for the chemical reactivity, allergenic potential, and related health effects of SPPs.</p>https://acp.copernicus.org/articles/21/6999/2021/acp-21-6999-2021.pdf |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
E. F. Mikhailov E. F. Mikhailov M. L. Pöhlker K. Reinmuth-Selzle S. S. Vlasenko O. O. Krüger J. Fröhlich-Nowoisky C. Pöhlker O. A. Ivanova A. A. Kiselev L. A. Kremper U. Pöschl |
spellingShingle |
E. F. Mikhailov E. F. Mikhailov M. L. Pöhlker K. Reinmuth-Selzle S. S. Vlasenko O. O. Krüger J. Fröhlich-Nowoisky C. Pöhlker O. A. Ivanova A. A. Kiselev L. A. Kremper U. Pöschl Water uptake of subpollen aerosol particles: hygroscopic growth, cloud condensation nuclei activation, and liquid–liquid phase separation Atmospheric Chemistry and Physics |
author_facet |
E. F. Mikhailov E. F. Mikhailov M. L. Pöhlker K. Reinmuth-Selzle S. S. Vlasenko O. O. Krüger J. Fröhlich-Nowoisky C. Pöhlker O. A. Ivanova A. A. Kiselev L. A. Kremper U. Pöschl |
author_sort |
E. F. Mikhailov |
title |
Water uptake of subpollen aerosol particles: hygroscopic growth, cloud condensation nuclei activation, and liquid–liquid phase separation |
title_short |
Water uptake of subpollen aerosol particles: hygroscopic growth, cloud condensation nuclei activation, and liquid–liquid phase separation |
title_full |
Water uptake of subpollen aerosol particles: hygroscopic growth, cloud condensation nuclei activation, and liquid–liquid phase separation |
title_fullStr |
Water uptake of subpollen aerosol particles: hygroscopic growth, cloud condensation nuclei activation, and liquid–liquid phase separation |
title_full_unstemmed |
Water uptake of subpollen aerosol particles: hygroscopic growth, cloud condensation nuclei activation, and liquid–liquid phase separation |
title_sort |
water uptake of subpollen aerosol particles: hygroscopic growth, cloud condensation nuclei activation, and liquid–liquid phase separation |
publisher |
Copernicus Publications |
series |
Atmospheric Chemistry and Physics |
issn |
1680-7316 1680-7324 |
publishDate |
2021-05-01 |
description |
<p>Pollen grains emitted from vegetation can release subpollen particles (SPPs)
that contribute to the fine fraction of atmospheric aerosols and may act as
cloud condensation nuclei (CCN), ice nuclei (IN), or aeroallergens. Here, we
investigate and characterize the hygroscopic growth and CCN activation of
birch, pine, and rapeseed SPPs. A high-humidity tandem differential mobility
analyzer (HHTDMA) was used to measure particle restructuring and water
uptake over a wide range of relative humidity (RH) from 2 % to 99.5 %,
and a continuous flow CCN counter was used for size-resolved measurements of
CCN activation at supersaturations (<span class="inline-formula"><i>S</i></span>) in the range of 0.2 % to 1.2 %.
For both subsaturated and supersaturated conditions, effective
hygroscopicity parameters, <span class="inline-formula"><i>κ</i></span>, were obtained by Köhler model
calculations. Gravimetric and chemical analyses, electron microscopy, and
dynamic light scattering measurements were performed to characterize further
properties of SPPs from aqueous pollen extracts such as chemical composition
(starch, proteins, DNA, and inorganic ions) and the hydrodynamic size
distribution of water-insoluble material. All investigated SPP samples
exhibited a sharp increase of water uptake and <span class="inline-formula"><i>κ</i></span> above
<span class="inline-formula">∼95</span> % RH, suggesting a liquid–liquid phase separation
(LLPS). The HHTDMA measurements at RH <span class="inline-formula">>95</span> % enable closure
between the CCN activation at water vapor supersaturation and hygroscopic
growth at subsaturated conditions, which is often not achieved when hygroscopicity tandem differential mobility analyzer (HTDMA) measurements are performed at lower RH where the water uptake and effective
hygroscopicity may be limited by the effects of LLPS. Such effects may be
important not only for closure between hygroscopic growth and CCN activation
but also for the chemical reactivity, allergenic potential, and related
health effects of SPPs.</p> |
url |
https://acp.copernicus.org/articles/21/6999/2021/acp-21-6999-2021.pdf |
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