Scanning Mobility CCN Analysis-A Method for Fast Measurements of Size-Resolved CCN Distributions and Activation Kinetics

被引：135

作者：

Moore, Richard H. ^{[2
]}

Nenes, Athanasios ^{[1
,2
]}

Medina, Jeessy ^{[2
]}

机构：

[1] Georgia Inst Technol, Sch Earth & Atmospher Sci, Atlanta, GA 30332 USA

[2] Georgia Inst Technol, Sch Chem & Biomol Engn, Atlanta, GA 30332 USA

来源：

AEROSOL SCIENCE AND TECHNOLOGY | 2010年 / 44卷 / 10期

基金：

美国国家科学基金会; 美国海洋和大气管理局;

关键词：

CLOUD CONDENSATION NUCLEI; DROPLET GROWTH-KINETICS; PART; AEROSOL; PARTICLES; INVERSION; CALIBRATION; DIAMETER; CLOSURE; AIR;

D O I：

10.1080/02786826.2010.498715

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

We present Scanning Mobility CCN Analysis (SMCA) as a novel method for obtaining rapid measurements of size-resolved cloud condensation nuclei (CCN) distributions and activation kinetics. SMCA involves sampling the monodisperse outlet stream of a Differential Mobility Analyzer (DMA) operated in scanning voltage mode concurrently with CCN and condensation particle counters. By applying the same inversion algorithm as used for obtaining size distributions with a scanning mobility particle sizer (SMPS), CCN concentration and activated droplet size are obtained as a function of mobility size over the timescale of an SMPS scan (typically 60-120 s). Methods to account for multiple charging, particle non-sphericity, and limited counting statistics are presented. SMCA is demonstrated using commercial SMPS and CFSTGC instruments with the manufacturer-provided control software. The method is evaluated for activation of both laboratory aerosol and ambient aerosol obtained during the 2004 NEAQS-ITCT2k4 field campaign. It is shown that SMCA reproduces the results obtained with a DMA operating in voltage "stepping" mode.

引用

页码：861 / 871

页数：11

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