气候变化领域集成服务门户(CCPortal): Solid Ammonium Nitrate Aerosols as Efficient Ice Nucleating Particles at Cirrus Temperatures

CCPortal

DOI	10.1029/2019JD032248
	Solid Ammonium Nitrate Aerosols as Efficient Ice Nucleating Particles at Cirrus Temperatures
	Wagner R.; Bertozzi B.; Höpfner M.; Höhler K.; Möhler O.; Saathoff H.; Leisner T.
发表日期	2020
ISSN	2169897X
卷号	125 期号:8
英文摘要	Recent satellite observations and high-altitude aircraft measurements have demonstrated the presence of solid ammonium nitrate particles in the Asian monsoon upper troposphere. Most likely, these particles are formed by a heterogeneous crystallization mechanism, given that efflorescence is strongly inhibited for pure ammonium nitrate solution droplets. Crystallization can be induced by the presence of ammonium sulfate, which more easily crystallizes and serves as a heterogeneous nucleus for the crystallization of ammonium nitrate. In the present study, we have investigated this crystallization pathway for different amounts of ammonium sulfate admixed to ammonium nitrate solution droplets and measured the heterogeneous ice nucleation ability of the crystallized particles at cirrus temperatures in a cloud chamber and with a continuous flow diffusion chamber. We found that an admixture of only 0.6 mol% of ammonium sulfate was sufficient to induce the crystallization of ammonium nitrate at 223 K and 22% RHw. These almost pure, crystalline ammonium nitrate particles showed the same temperature-dependent ice nucleation behavior as observed for other inorganic salts like ammonium sulfate and sodium chloride. At temperatures above 230 K, the crystalline ammonium nitrate particles first deliquesced and nucleated ice homogeneously at ice saturation ratios between about 1.45 and 1.50. Below 230 K, heterogeneous ice nucleation was observed to start at an ice saturation ratio as low as 1.13. The deduced ice nucleation active surface site densities were in the range from 1010–1011 m−2 at ice saturation ratios between 1.2 and 1.4, thus similar in magnitude to those of desert dust particles. ©2020. American Geophysical Union. All Rights Reserved.
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186048
作者单位	Karlsruhe Institute of Technology (KIT), Institute of Meteorology and Climate Research (IMK), Eggenstein-Leopoldshafen, Germany
推荐引用方式 GB/T 7714	Wagner R.,Bertozzi B.,Höpfner M.,et al. Solid Ammonium Nitrate Aerosols as Efficient Ice Nucleating Particles at Cirrus Temperatures[J],2020,125(8).
APA	Wagner R..,Bertozzi B..,Höpfner M..,Höhler K..,Möhler O..,...&Leisner T..(2020).Solid Ammonium Nitrate Aerosols as Efficient Ice Nucleating Particles at Cirrus Temperatures.Journal of Geophysical Research: Atmospheres,125(8).
MLA	Wagner R.,et al."Solid Ammonium Nitrate Aerosols as Efficient Ice Nucleating Particles at Cirrus Temperatures".Journal of Geophysical Research: Atmospheres 125.8(2020).