Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-18-1785-2018 |
Characterization of individual ice residual particles by the single droplet freezing method: a case study in the Asian dust outflow region | |
Iwata, Ayumi1; Matsuki, Atsushi2 | |
2018-02-07 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS
![]() |
ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2018 |
卷号 | 18期号:3页码:1785-1804 |
文章类型 | Article |
语种 | 英语 |
国家 | Japan |
英文摘要 | In order to better characterize ice nucleating (IN) aerosol particles in the atmosphere, we investigated the chemical composition, mixing state, and morphology of atmospheric aerosols that nucleate ice under conditions relevant for mixed-phase clouds. Five standard mineral dust samples (quartz, K-feldspar, Na-feldspar, Arizona test dust, and Asian dust source particles) were compared with actual aerosol particles collected from the west coast of Japan (the city of Kanazawa) during Asian dust events in February and April 2016. Following droplet activation by particles deposited on a hydrophobic Si (silicon) wafer substrate under supersaturated air, individual IN particles were located using an optical microscope by gradually cooling the temperature to -30 degrees C. For the aerosol samples, both the IN active particles and non-active particles were analyzed individually by atomic force microscopy (AFM), micro-Raman spectroscopy, and scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDX). Heterogeneous ice nucleation in all standard mineral dust samples tested in this study was observed at consistently higher temperatures (e.g., -22.2 to 24.2 degrees C with K-feldspar) than the homogeneous freezing temperature (36.5 degrees C). Meanwhile, most of the IN active atmospheric particles formed ice below 28 degrees C, i.e., at lower temperatures than the standard mineral dust samples of pure components. The most abundant IN active particles above 30 degrees C were predominantly irregular solid particles that showed clay mineral characteristics (or mixtures of several mineral components). Other than clay, Ca-rich particles internally mixed with other components, such as sulfate, were also regarded as IN active particle types. Moreover, sea salt particles were predominantly found in the non-active fraction, and internal mixing with sea salt clearly acted as a significant inhibiting agent for the ice nucleation activity of mineral dust particles. Also, relatively pure or fresh calcite, Ca(NO3)(2), and (NH4)(2)SO4 particles were more often found in the non-active fraction. In this study, we demonstrated the capability of the combined single droplet freezing method and thorough individual particle analysis to characterize the ice nucleation activity of atmospheric aerosols. We also found that dramatic changes in the particle mixing states during long-range transport had a complex effect on the ice nucleation activity of the host aerosol particles. A case study in the Asian dust outflow region highlighted the need to consider particle mixing states, which can dramatically influence ice nucleation activity. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000424327800002 |
WOS关键词 | BIOLOGICAL AEROSOL-PARTICLES ; NUCLEATION ACTIVE-SITES ; SOLID AMMONIUM-SULFATE ; MIXED-PHASE CLOUDS ; MINERAL DUST ; CHEMICAL-COMPOSITION ; MIXING-STATE ; EAST-ASIA ; RAMAN ; WATER |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/27270 |
专题 | 地球科学 |
作者单位 | 1.Kanazawa Univ, Grad Sch Nat Sci & Technol, Kanazawa, Ishikawa 9201192, Japan; 2.Kanazawa Univ, Inst Nat & Environm Technol, Kanazawa, Ishikawa 9201192, Japan |
推荐引用方式 GB/T 7714 | Iwata, Ayumi,Matsuki, Atsushi. Characterization of individual ice residual particles by the single droplet freezing method: a case study in the Asian dust outflow region[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2018,18(3):1785-1804. |
APA | Iwata, Ayumi,&Matsuki, Atsushi.(2018).Characterization of individual ice residual particles by the single droplet freezing method: a case study in the Asian dust outflow region.ATMOSPHERIC CHEMISTRY AND PHYSICS,18(3),1785-1804. |
MLA | Iwata, Ayumi,et al."Characterization of individual ice residual particles by the single droplet freezing method: a case study in the Asian dust outflow region".ATMOSPHERIC CHEMISTRY AND PHYSICS 18.3(2018):1785-1804. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论