Calculating the aerosol asymmetry factor based on measurements from the humidified nephelometer system

Zhao, Gang; Zhao, Chunsheng; Kuang, Ye; Bian, Yuxuan; Tao, Jiangchuan; Shen, Chuanyang; Yu, Yingli

The aerosol asymmetry factor (inline-formulag) is one of the most important factors for assessing direct aerosol radiative forcing. However, little attention has been paid to the measurement and parameterization of inline-formulag. In this study, the characteristics of inline-formulag are studied based on field measurements over the North China Plain (NCP) using the Mie scattering theory. The results show that calculated inline-formulag values for dry aerosol can vary over a wide range (between 0.54 and 0.67). Furthermore, when ambient relative humidity (RH) reaches 90 %, inline-formulag is significantly enhanced by a factor of 1.2 due to aerosol hygroscopic growth. For the first time, a novel method of calculating inline-formulag based on measurements from the humidified nephelometer system is proposed. This method can constrain the uncertainty of inline-formulag to within 2.56 % for dry aerosol populations and 4.02 % for ambient aerosols, providing that aerosol hygroscopic growth is taken into account. Sensitivity studies show that aerosol hygroscopicity plays a vital role in the accuracy of predicting inline-formulag.

Zitieren

Zitierform:

Zhao, Gang / Zhao, Chunsheng / Kuang, Ye / et al: Calculating the aerosol asymmetry factor based on measurements from the humidified nephelometer system. 2018. Copernicus Publications.

Zugriffsstatistik

Gesamt:
Volltextzugriffe:
Metadatenansicht:
12 Monate:
Volltextzugriffe:
Metadatenansicht:

Grafik öffnen

Rechte

Rechteinhaber: Gang Zhao et al.

Nutzung und Vervielfältigung:

Export