期刊
ATMOSPHERIC ENVIRONMENT
卷 296, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2023.119592
关键词
Cloud condensation nuclei; Aerosol; CCN activation; Parameterization; Mt; Lu
In order to understand the characteristics of high-altitude aerosols and cloud condensation nuclei (CCN) in East China during the Asian winter monsoon, a field campaign was conducted at Mt. Lu from November 5 to December 10, 2019. The study analyzed the features of CCN and CCN formation at Mt. Lu, and found that aerosol composition plays a larger role than aerosol size in determining CCN activation. The study also observed diurnal variations in CCN and CN concentrations at Mt. Lu, with higher concentrations occurring at midday.
To better understand the characteristics of high-altitude aerosol (or condensation nuclei, CN) and cloud condensation nuclei (CCN) in East China during the Asian winter monsoon, a field campaign focused on aerosol and CCN was set up in the area of Mt. Lu during the period from 5 November to 10 December 2019. The features of CCN and CCN formation at Mt. Lu were analyzed. The CCN spectra at Mt. Lu belongs to a polluted continental type, which could be parameterized using N = 2498S0.31, with S denoting supersaturation. The average and standard deviation of the CCN (S = 0.4%) and CN concentrations were 1936 +/- 1007 cm-3 and 3041 +/- 1646 cm-3, respectively. The CCN activation fraction (AF) values are 0.43, 0.57, 0.64, 0.69, and 0.72 at S = 0.2%, S = 0.4%, S = 0.6%, S = 0.8% and S = 1%, respectively. The aerosol composition would be more important than aerosol size in determining CCN activation at Mt. Lu. The CCN (CN) number concentration had a clear diurnal variation with maximal and minimal values at 13:00 (12:00 and 18:00) and 07:00 (07:00), respectively. Nearly 68.7% of the air mass reaching Mt. Lu came from the northern area. The higher-sulfate-ratio air mass has a relatively high AF efficiency.
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