A New Approach for Characterization of Single Raindrops
A New Approach for Characterization of Single Raindrops
复制标题
表征单个雨滴的新方法
DOI：
10.1007/978-94-007-0810-5_114
复制
发表时间：
2001
期刊：
影响因子：
--
通讯作者：
T. Kamiya
中科院分区：
文献类型：
--
作者：
Chang;M. Kasahara;S. Tohno;T. Kamiya
为了确定单个雨滴的特性与其大小的关系，胶棉薄膜法被新应用于单个雨滴的取样。1999年9月至11月降雨期间，在位于日本宇治的京都大学大楼地面以上20 m高度处对单个雨滴进行了采样。用火棉胶薄膜法可以成功地复制雨滴。我们试图分析原子核的元素成分和污染物，这些污染物被结合到发展中的雨滴中。对单个雨滴的分析，采用了粒子感生X射线荧光分析（PIXE）。PIXE分析结果表明，单滴雨滴中含有S等多种元素。各元素的浓度随液滴直径的减小而增大。此外，为了获得更详细的信息，如内部结构和混合状态的单个雨滴，微观PIXE分析。用微区PIXE分析了单个雨滴的成核中心。用直径为1 ~ 2 μm的扫描束和约70 pA的束流可明显地检测到Ca、S和Fe。
To determine the characteristics of single raindrops as a function of their size, the collodion film method was newly applied to the sampling of single raindrops. Sampling of single raindrops was performed at a height of 20 m above ground level of the Kyoto University building located in Uji, Japan during rain events from September to November 1999. It was possible to get successfully replicas of raindrop by collodion film method. And we tried to analyze the elemental components of the nuclei and pollutants that were incorporated into the developing raindrop. To the analysis of single raindrops, Particle Induced X-ray Emission (PIXE) was applied. Several elements including S in single raindrops were detected by PIXE. The concentrations of every element increased with decreasing drop diameter. Furthermore, to acquire more detailed information such as inner-structure and mixing state in single raindrops, micro-PIXE analysis was performed. The nucleation centers of single raindrops were successfully analyzed by micro-PIXE. Ca, S and Fe were apparently detected by scanning beam of 1 ∼ 2 µm diameter and about 70 pA beam current.