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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ftcopernicus:oai:publications.copernicus.org:acp110355 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 Knopf, Daniel A. Wang, Peiwen Wong, Benny Tomlin, Jay M. Veghte, Daniel P. Lata, Nurun N. China, Swarup Laskin, Alexander Moffet, Ryan C. Aller, Josephine Y. Marcus, Matthew A. Wang, Jian 2023-08-08 application/pdf https://doi.org/10.5194/acp-23-8659-2023 https://acp.copernicus.org/articles/23/8659/2023/ eng eng doi:10.5194/acp-23-8659-2023 https://acp.copernicus.org/articles/23/8659/2023/ eISSN: 1680-7324 Text 2023 ftcopernicus https://doi.org/10.5194/acp-23-8659-2023 2023-08-14T16:24:22Z 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 ... Text North Atlantic Copernicus Publications: E-Journals Atmospheric Chemistry and Physics 23 15 8659 8681 |
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Open Polar |
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Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
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 |
Text |
author |
Knopf, Daniel A. Wang, Peiwen Wong, Benny Tomlin, Jay M. Veghte, Daniel P. Lata, Nurun N. China, Swarup Laskin, Alexander Moffet, Ryan C. Aller, Josephine Y. Marcus, Matthew A. Wang, Jian |
spellingShingle |
Knopf, Daniel A. Wang, Peiwen Wong, Benny Tomlin, Jay M. Veghte, Daniel P. Lata, Nurun N. China, Swarup Laskin, Alexander Moffet, Ryan C. Aller, Josephine Y. Marcus, Matthew A. Wang, Jian Physicochemical characterization of free troposphere and marine boundary layer ice-nucleating particles collected by aircraft in the eastern North Atlantic |
author_facet |
Knopf, Daniel A. Wang, Peiwen Wong, Benny Tomlin, Jay M. Veghte, Daniel P. Lata, Nurun N. China, Swarup Laskin, Alexander Moffet, Ryan C. Aller, Josephine Y. Marcus, Matthew A. Wang, Jian |
author_sort |
Knopf, Daniel A. |
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 |
publishDate |
2023 |
url |
https://doi.org/10.5194/acp-23-8659-2023 https://acp.copernicus.org/articles/23/8659/2023/ |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
eISSN: 1680-7324 |
op_relation |
doi:10.5194/acp-23-8659-2023 https://acp.copernicus.org/articles/23/8659/2023/ |
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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1776202098101190656 |