دورية أكاديمية
Low-temperature ice nucleation of sea spray and secondary marine aerosols under cirrus cloud conditions
| العنوان: | Low-temperature ice nucleation of sea spray and secondary marine aerosols under cirrus cloud conditions |
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| المؤلفون: | Patnaude, Ryan J., Moore, Kathryn A., Perkins, Russell J., Hill, Thomas C. J., DeMott, Paul J., Kreidenweis, Sonia M. |
| بيانات النشر: | Copernicus Publications |
| سنة النشر: | 2024 |
| المجموعة: | Niedersächsisches Online-Archiv NOA (Gottfried Wilhelm Leibniz Bibliothek Hannover) |
| مصطلحات موضوعية: | article, Verlagsveröffentlichung |
| الوصف: | Sea spray aerosols (SSAs) represent one of the most abundant aerosol types on a global scale and have been observed at all altitudes including the upper troposphere. SSA has been explored in recent years as a source of ice-nucleating particles (INPs) in cirrus clouds due to the ubiquity of cirrus clouds and the uncertainties in their radiative forcing. This study expands upon previous works on low-temperature ice nucleation of SSA by investigating the effects of atmospheric aging of SSA and the ice-nucleating activity of newly formed secondary marine aerosols (SMAs) using an oxidation flow reactor. Polydisperse aerosol distributions were generated from a marine aerosol reference tank (MART) filled with 120 L of real or artificial seawater and were dried to very low relative humidity to crystallize the salt constituents of SSA prior to their subsequent freezing, which was measured using a continuous flow diffusion chamber (CFDC). Results show that for primary SSA (pSSA), as well as aged SSA and SMA (aSSA+SMA) at temperatures >220 K, homogeneous conditions (92 %–97 % relative humidity with respect to water – RHw) were required to freeze 1 % of the particles. However, below 220 K, heterogeneous nucleation occurs for both pSSA and aSSA+SMA at much lower RHw, where up to 1 % of the aerosol population freezes between 75 % and 80 % RHw. Similarities between freezing behaviors of the pSSA and aSSA+SMA at all temperatures suggest that the contributions of condensed organics onto the pSSA or alteration of functional groups in pSSA via atmospheric aging did not hinder the major heterogeneous ice nucleation process at these cirrus temperatures, which have previously been shown to be dominated by the crystalline salts. Occurrence of a 1 % frozen fraction of SMA, generated in the absence of primary SSA, was observed at or near water saturation below 220 K, suggesting it is not an effective INP at cirrus temperatures, similar to findings in the literature on other organic aerosols. Thus, any SMA coatings on the pSSA would ... |
| نوع الوثيقة: | article in journal/newspaper |
| وصف الملف: | electronic |
| اللغة: | English |
| العلاقة: | Atmospheric Chemistry and Physics -- http://www.atmos-chem-phys.net/volumes_and_issues.htmlTest -- http://www.bibliothek.uni-regensburg.de/ezeit/?2069847Test -- 1680-7324; https://doi.org/10.5194/acp-24-911-2024Test; https://noa.gwlb.de/receive/cop_mods_00071186Test; https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00069486/acp-24-911-2024.pdfTest; https://acp.copernicus.org/articles/24/911/2024/acp-24-911-2024.pdfTest |
| DOI: | 10.5194/acp-24-911-2024 |
| الإتاحة: | https://doi.org/10.5194/acp-24-911-2024Test https://noa.gwlb.de/receive/cop_mods_00071186Test https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00069486/acp-24-911-2024.pdfTest https://acp.copernicus.org/articles/24/911/2024/acp-24-911-2024.pdfTest |
| حقوق: | https://creativecommons.org/licenses/by/4.0Test/ ; uneingeschränkt ; info:eu-repo/semantics/openAccess |
| رقم الانضمام: | edsbas.575C6D6 |
| قاعدة البيانات: | BASE |
| DOI: | 10.5194/acp-24-911-2024 |
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