| DOI: | 10.1002/jgrd.50325
|
| 论文题名: | Heterogeneous ice nucleation ability of crystalline sodium chloride dihydrate particles |
| 作者: | Wagner R.; Möhler O.
|
| 刊名: | Journal of Geophysical Research Atmospheres
|
| ISSN: | 21698996
|
| 出版年: | 2013
|
| 卷: | 118, 期:10 | | 起始页码: | 4610
|
| 结束页码: | 4622
|
| 语种: | 英语
|
| 英文关键词: | heterogeneous ice nucleation
; sea salt aerosol
; sodium chloride dihydrate
|
| Scopus关键词: | Aerosols
; Crystalline materials
; Deposition
; Nucleation
; Sodium chloride
; Active surface sites
; Aqueous NaCl solutions
; Dihydrates
; Ice nucleation
; Mineral dust particles
; Nucleation temperature
; Number concentration
; Sea salt aerosol
; Ice
; aerosol
; cooling
; crystallinity
; expansion
; ice
; nucleation
; relative humidity
; saturation
; sea salt
; sodium chloride
; Baden-Wurttemberg
; Germany
; Karlsruhe
|
| 英文摘要: | The aerosol and cloud chamber AIDA (Aerosol Interactions and Dynamics in the Atmosphere) of the Karlsruhe Institute of Technology has been used to quantify the deposition mode ice nucleation ability of airborne crystalline sodium chloride dihydrate (NaCl â̂" 2H2O) particles with median diameters between 0.06 and 1.1 μm. For this purpose, expansion cooling experiments with starting temperatures from 235 to 216 K were conducted. Recently, supermicron-sized NaCl â̂" 2H2O particles deposited onto a surface have been observed to be ice-active in the deposition mode at temperatures below 238 K, requiring a median threshold ice saturation ratio of only 1.02 in the range from 238 to 221 K. In AIDA, heterogeneous ice nucleation by NaCl â̂" 2H2O was first detected at a temperature of 227.1 K with a concomitant threshold ice saturation ratio of 1.25. Above that temperature, the crystallized salt particles underwent a deliquescence transition to form aqueous NaCl solution droplets upon increasing relative humidity. At nucleation temperatures below 225 K, the inferred threshold ice saturation ratios varied between 1.15 and 1.20. The number concentration of the nucleated ice crystals was related to the surface area of the seed aerosol particles to deduce the ice nucleation active surface site (INAS) density of the aerosol population as a function of the ice supersaturation. Maximum INAS densities of about 6 · 1010 m-2 at an ice saturation ratio of 1.20 were found for temperatures below 225 K. These INAS densities are similar to those recently derived for deposition mode ice nucleation on mineral dust particles. Key PointsNaCl dihydrate particles act as heterogeneous ice nuclei in the deposition mode ©2013. American Geophysical Union. All Rights Reserved. |
| Citation statistics: |
|
| 资源类型: | 期刊论文
|
| 标识符: | http://119.78.100.158/handle/2HF3EXSE/63739
|
| Appears in Collections: | 影响、适应和脆弱性
气候减缓与适应
|
|
There are no files associated with this item.
|
|
作者单位: | Karlsruhe Institute of Technology (KIT), Institute for Meteorology and Climate Research (IMK-AAF), Eggenstein-Leopoldshafen, Germany
|
| Recommended Citation: | |
Wagner R.,Möhler O.. Heterogeneous ice nucleation ability of crystalline sodium chloride dihydrate particles[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(10)
|
|
|