Abstract
Abstract. Hygroscopicity largely determines phase state, chemical reactivity, optical properties, and cloud nucleation activities of aerosol particles, thus significantly affecting their impacts on visibility, atmospheric chemistry, and climate. In the last 20 years, a large number of field studies have investigated the hygroscopicity of tropospheric aerosols in China under subsaturated and supersaturated conditions. Aerosol hygroscopicity measurements in China are reviewed in this paper: (1) a comprehensive summary and critical discussion of aerosol hygroscopicity measurements in China are provided; (2) available measurement data are compiled and presented under a consistent framework to enhance their accessibility and usability; and (3) current knowledge gaps are identified, and an outlook which could serve as guidelines for planning future research is also proposed.
Highlights
In the last few decades, rapid industrial, economic, and social developments in China have caused large emissions of gaseous and particulate pollutants in the troposphere (M. Li et al, 2017) where they are mixed with gases and aerosols from natural sources
We provide a comprehensive review of the hygroscopic properties of ambient aerosols measured using HTDMA in China; in addition, condensation nucleation (CCN) activities of tropospheric aerosols measured in China are reviewed and discussed
An aerosol flow, dried to < 20 % relative humidity (RH), is passed through an aerosol neutralizer and the first differential mobility analyzer (DMA) to produce quasi-monodisperse aerosols with a given mobility diameter; after that, the aerosol flow is delivered through a humidifier to be humidified to a given RH, and subsequently aerosol size distributions are measured using the second DMA coupled with a condensation particle counter (CPC)
Summary
In the last few decades, rapid industrial, economic, and social developments in China have caused large emissions of gaseous and particulate pollutants in the troposphere (M. Li et al, 2017) where they are mixed with gases and aerosols from natural sources. Under unfavorable meteorological conditions (i.e., when air is stagnant and stable), severe air pollution occurs due to the accumulation of primary pollutants and, more importantly, the formation of secondary pollutants The concept of air pollution complex has been proposed to describe the complexity of air pollution in China, which is characterized by complex sources and complex interactions of a myriad of gaseous and particulate pollutants
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