Physicochemical characterization of free troposphere and marine boundary layer ice-nucleating particles collected by aircraft in the eastern North Atlantic
Atmospheric ice nucleation impacts the hydrological cycle and climate by modifying the radiative properties of clouds. To improve our predictive understanding of ice formation, ambient ice-nucleating particles (INPs) need to be collected and characterized. Measurements of INPs at lower latitudes in...
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ftdoajarticles:oai:doaj.org/article:eed1f32144fe4b6180a81b1d3b40f691 2023-09-05T13:21:30+02:00 Physicochemical characterization of free troposphere and marine boundary layer ice-nucleating particles collected by aircraft in the eastern North Atlantic D. A. Knopf P. Wang B. Wong J. M. Tomlin D. P. Veghte N. N. Lata S. China A. Laskin R. C. Moffet J. Y. Aller M. A. Marcus J. Wang 2023-08-01T00:00:00Z https://doi.org/10.5194/acp-23-8659-2023 https://doaj.org/article/eed1f32144fe4b6180a81b1d3b40f691 EN eng Copernicus Publications https://acp.copernicus.org/articles/23/8659/2023/acp-23-8659-2023.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-23-8659-2023 1680-7316 1680-7324 https://doaj.org/article/eed1f32144fe4b6180a81b1d3b40f691 Atmospheric Chemistry and Physics, Vol 23, Pp 8659-8681 (2023) Physics QC1-999 Chemistry QD1-999 article 2023 ftdoajarticles https://doi.org/10.5194/acp-23-8659-2023 2023-08-13T00:39:49Z Atmospheric ice nucleation impacts the hydrological cycle and climate by modifying the radiative properties of clouds. To improve our predictive understanding of ice formation, ambient ice-nucleating particles (INPs) need to be collected and characterized. Measurements of INPs at lower latitudes in a remote marine region are scarce. The Aerosol and Cloud Experiments in the Eastern North Atlantic (ACE-ENA) campaign, in the region of the Azores islands, provided the opportunity to collect particles in the marine boundary layer (MBL) and free troposphere (FT) by aircraft during the campaign's summer and winter intensive operation period. The particle population in samples collected was examined by scanning transmission X-ray microscopy with near-edge X-ray absorption fine structure spectroscopy. The identified INPs were analyzed by scanning electron microscopy with energy-dispersive X-ray analysis. We observed differences in the particle population characteristics in terms of particle diversity, mixing state, and organic volume fraction between seasons, mostly due to dry intrusion events during winter, as well as between the sampling locations of the MBL and FT. These differences are also reflected in the temperature and humidity conditions under which water uptake, immersion freezing (IMF), and deposition ice nucleation (DIN) proceed. Identified INPs reflect typical particle types within the particle population on the samples and include sea salt, sea salt with sulfates, and mineral dust, all associated with organic matter, as well as carbonaceous particles. IMF and DIN kinetics are analyzed with respect to heterogeneous ice nucleation rate coefficients, J het , and ice nucleation active site density, n s , as a function of the water criterion Δ a w . DIN is also analyzed in terms of contact angles following classical nucleation theory. Derived MBL IMF kinetics agree with previous ACE-ENA ground-site INP measurements. FT particle samples show greater ice nucleation propensity compared to MBL particle samples. This ... Article in Journal/Newspaper North Atlantic Directory of Open Access Journals: DOAJ Articles Atmospheric Chemistry and Physics 23 15 8659 8681 |
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ftdoajarticles |
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English |
topic |
Physics QC1-999 Chemistry QD1-999 |
spellingShingle |
Physics QC1-999 Chemistry QD1-999 D. A. Knopf P. Wang B. Wong J. M. Tomlin D. P. Veghte N. N. Lata S. China A. Laskin R. C. Moffet J. Y. Aller M. A. Marcus J. Wang Physicochemical characterization of free troposphere and marine boundary layer ice-nucleating particles collected by aircraft in the eastern North Atlantic |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
Atmospheric ice nucleation impacts the hydrological cycle and climate by modifying the radiative properties of clouds. To improve our predictive understanding of ice formation, ambient ice-nucleating particles (INPs) need to be collected and characterized. Measurements of INPs at lower latitudes in a remote marine region are scarce. The Aerosol and Cloud Experiments in the Eastern North Atlantic (ACE-ENA) campaign, in the region of the Azores islands, provided the opportunity to collect particles in the marine boundary layer (MBL) and free troposphere (FT) by aircraft during the campaign's summer and winter intensive operation period. The particle population in samples collected was examined by scanning transmission X-ray microscopy with near-edge X-ray absorption fine structure spectroscopy. The identified INPs were analyzed by scanning electron microscopy with energy-dispersive X-ray analysis. We observed differences in the particle population characteristics in terms of particle diversity, mixing state, and organic volume fraction between seasons, mostly due to dry intrusion events during winter, as well as between the sampling locations of the MBL and FT. These differences are also reflected in the temperature and humidity conditions under which water uptake, immersion freezing (IMF), and deposition ice nucleation (DIN) proceed. Identified INPs reflect typical particle types within the particle population on the samples and include sea salt, sea salt with sulfates, and mineral dust, all associated with organic matter, as well as carbonaceous particles. IMF and DIN kinetics are analyzed with respect to heterogeneous ice nucleation rate coefficients, J het , and ice nucleation active site density, n s , as a function of the water criterion Δ a w . DIN is also analyzed in terms of contact angles following classical nucleation theory. Derived MBL IMF kinetics agree with previous ACE-ENA ground-site INP measurements. FT particle samples show greater ice nucleation propensity compared to MBL particle samples. This ... |
format |
Article in Journal/Newspaper |
author |
D. A. Knopf P. Wang B. Wong J. M. Tomlin D. P. Veghte N. N. Lata S. China A. Laskin R. C. Moffet J. Y. Aller M. A. Marcus J. Wang |
author_facet |
D. A. Knopf P. Wang B. Wong J. M. Tomlin D. P. Veghte N. N. Lata S. China A. Laskin R. C. Moffet J. Y. Aller M. A. Marcus J. Wang |
author_sort |
D. A. Knopf |
title |
Physicochemical characterization of free troposphere and marine boundary layer ice-nucleating particles collected by aircraft in the eastern North Atlantic |
title_short |
Physicochemical characterization of free troposphere and marine boundary layer ice-nucleating particles collected by aircraft in the eastern North Atlantic |
title_full |
Physicochemical characterization of free troposphere and marine boundary layer ice-nucleating particles collected by aircraft in the eastern North Atlantic |
title_fullStr |
Physicochemical characterization of free troposphere and marine boundary layer ice-nucleating particles collected by aircraft in the eastern North Atlantic |
title_full_unstemmed |
Physicochemical characterization of free troposphere and marine boundary layer ice-nucleating particles collected by aircraft in the eastern North Atlantic |
title_sort |
physicochemical characterization of free troposphere and marine boundary layer ice-nucleating particles collected by aircraft in the eastern north atlantic |
publisher |
Copernicus Publications |
publishDate |
2023 |
url |
https://doi.org/10.5194/acp-23-8659-2023 https://doaj.org/article/eed1f32144fe4b6180a81b1d3b40f691 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Atmospheric Chemistry and Physics, Vol 23, Pp 8659-8681 (2023) |
op_relation |
https://acp.copernicus.org/articles/23/8659/2023/acp-23-8659-2023.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-23-8659-2023 1680-7316 1680-7324 https://doaj.org/article/eed1f32144fe4b6180a81b1d3b40f691 |
op_doi |
https://doi.org/10.5194/acp-23-8659-2023 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
23 |
container_issue |
15 |
container_start_page |
8659 |
op_container_end_page |
8681 |
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1776202101784838144 |