A new method for calculating number concentrations of cloud condensation nuclei based on measurements of a three-wavelength humidified nephelometer system
A new method for calculating number concentrations of cloud condensation nuclei based on measurements of a three-wavelength humidified nephelometer system
复制标题
基于三波长加湿浊度计系统测量计算云凝核数浓度的新方法
DOI：
10.5194/amt-11-895-2018
复制
发表时间：
2017-07
影响因子：
3.8
通讯作者：
Xu Wanyun
中科院分区：
文献类型：
--
作者：
Tao Jiangchuan;Zhao Chunsheng;Kuang Ye;Zhao Gang;Shen Chuanyang;Yu Yingli;Bian Yuxuan;Xu Wanyun
Abstract. The number concentration of cloud condensation nuclei (CCN) plays a fundamental role in cloud physics. Instrumentations of direct measurements of CCN number concentration (NCCN) based on chamber technology are complex and costly; thus a simple way for measuring NCCN is needed. In this study, a new method for NCCN calculation based on measurements of a three-wavelength humidified nephelometer system is proposed. A three-wavelength humidified nephelometer system can measure the aerosol light-scattering coefficient (σsp) at three wavelengths and the light-scattering enhancement factor (fRH). The Angstrom exponent (A) inferred from σsp at three wavelengths provides information on mean predominate aerosol size, and hygroscopicity parameter (κ) can be calculated from the combination of fRH and A. Given this, a lookup table that includes σsp, κ and A is established to predict NCCN. Due to the precondition for the application, this new method is not suitable for externally mixed particles, large particles (e.g., dust and sea salt) or fresh aerosol particles. This method is validated with direct measurements of NCCN using a CCN counter on the North China Plain. Results show that relative deviations between calculated NCCN and measured NCCN are within 30 % and confirm the robustness of this method. This method enables simplerNCCN measurements because the humidified nephelometer system is easily operated and stable. Compared with the method using a CCN counter, another advantage of this newly proposed method is that it can obtain NCCN at lower supersaturations in the ambient atmosphere.
登录
查看更多内容
影响因子：
5.2
作者：
T. Lathem;A. Nenes
通讯作者：
T. Lathem;A. Nenes
影响因子：
6.3
作者：
通讯作者：
--
影响因子：
6.3
作者：
Y. Shinozuka;A. Clarke;A. Nenes;A. Jefferson;R. Wood;C. McNaughton;J. Ström;P. Tunved;J. Redemann;K. Thornhill;R. Moore;T. Lathem;Jack J. Lin;Y. Yoon
通讯作者：
Y. Shinozuka;A. Clarke;A. Nenes;A. Jefferson;R. Wood;C. McNaughton;J. Ström;P. Tunved;J. Redemann;K. Thornhill;R. Moore;T. Lathem;Jack J. Lin;Y. Yoon
影响因子：
--
作者：
V. Kapustin;A. Clarke;Y. Shinozuka;S. Howell;V. Brekhovskikh;T. Nakajima;A. Higurashi
通讯作者：
V. Kapustin;A. Clarke;Y. Shinozuka;S. Howell;V. Brekhovskikh;T. Nakajima;A. Higurashi
影响因子：
6.3
作者：
D. Rose;S. S. Gunthe-S.;E. Mikhailov;G. Frank;U. Dusek;M. Andreae;U. Pöschl
通讯作者：
D. Rose;S. S. Gunthe-S.;E. Mikhailov;G. Frank;U. Dusek;M. Andreae;U. Pöschl